LED Drivers for LCD Backlights White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type) BD6150MUV No.11040EBT06 ●Description BD6150MUV is white LED driver IC with PWM step-up DC/DC converter that can boost max 40V and current driver that can drive max 30mA. The wide and precision brightness can be controlled by external PWM pulse. BD6150MUV has very accurate current drivers, and it has few current errors between each strings. So, it will be helpful to reduce brightness spots on the LCD. Small package type is suited for saving space. ●Features 1) High efficiency PWM step-up DC/DC converter (fsw=1.25MHz / 0.75MHz) 2) High accuracy & good matching current drivers (MAX30mA/ch) 3) Integrated 50V power Nch MOSFET 4) Soft start 5) Drive up to 10 in series 6strings in parallel 6) Wide input voltage range (4.2V ~ 26V) 7) Rich safety functions ・Over-voltage protection ・Over current limit ・LED terminal open/short protect ・External SBD open detect / Output short protection ・UVLO ・Thermal shutdown 8) Small & thin package (VQFN024V4040) 4.0 × 4.0 × 1.0mm ●Applications All middle size LCD equipments backlight of Notebook PC, portable DVD player, car navigation systems, etc. ●Absolute maximum ratings (Ta=25℃) Parameter Symbol Ratings Unit Maximum applied voltage 1 VMAX1 7 V Maximum applied voltage 2 VMAX2 25 V Maximum applied voltage 3 VMAX3 30.5 V VBAT, FAILFLAG, PWMPOW Maximum applied voltage 4 VMAX4 41 V SW Power dissipation 1 Pd1 500 *1 mW Power dissipation 2 Pd2 780 *2 mW Power dissipation 3 Pd3 1510 *3 mW Operating temperature range Topr -40 ~ +85 ℃ Storage temperature range Tstg -55 ~ +150 ℃ *1 *2 *3 Condition VREG, ISET, PWMDRV, FSEL, OCPSET, VDET, TEST LED1, LED2, LED3, LED4, LED5, LED6 Reduced 4.0mW/℃ With Ta>25℃ when not mounted on a heat radiation Board. 1 layer (ROHM Standard board) has been mounted. Copper foil area 0mm2, When it’s used by more than Ta=25℃, it’s reduced by 6.2mW/℃. 4 layer (JEDEC Compliant board) has been mounted. Copper foil area 1layer 6.28mm2, Copper foil area 2~4layers 5655.04mm2, When it’s used by more than Ta=25℃, it’s reduced by 12.1mW/℃. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/28 2011.06 - Rev.B Technical Note BD6150MUV ●Recommended operating range (Ta=-40℃ ~ +85℃) Parameter Power supply voltage Symbol VBAT Limits Min. Typ. Max. 4.2 12.0 26.0 ●Electrical characteristic (Unless otherwise specified, VBAT=12V, Ta = +25℃) Limits Parameter Symbol Min. Typ. Max. Unit Condition V Unit Condition Quiescent current Iq - 1.6 4.4 µA PWMPOW=0V Current consumption Idd - 3.2 4.8 mA VDET=0V,ISET=22kΩ POWL 0 - 0.9 V [PWMPOW Terminal] Low input voltage range1 High input voltage range1 POWH 2.1 - VBAT V Pull down resistor1 POWR 100 300 500 kΩ PWMPOW=3V [PWMDRV Terminal] Low input voltage range2 PDRVL 0 - 0.9 V High input voltage range2 PDRVH 2.1 - 5.5 V DRVR 100 300 500 kΩ Low input voltage range3 FSL 0 - 0.9 V High input voltage range3 FSH 2.1 - 6.0 V Pull down resistor3 FSR 100 300 500 kΩ FSEL=1V Input resistor FFIR 1.0 2.0 3.0 kΩ FAILFLAG=2.5V Off current FFIST - 0.1 2.0 µA PWMPOW=0V VREG voltage VREG 4.2 5.0 6.0 V No load Under voltage lock out UVLO 3.3 3.7 4.1 V VBAT falling edge Pull down resistor2 [FSEL Terminal] [FAILFLAG] [Regulator] [Switching Regulator] LED control voltage VLED 0.56 0.70 0.84 V Switching frequency fsw 1.00 1.25 1.50 MHz Duty cycle limit Duty 91 95.0 99.0 % LED1-6=0.3V SW Nch FET RON RON - 0.48 0.58 Ω ISW=80mA Over current limit Ocp 1.4 2.0 2.6 A *1 OCPSET open protect OOP - 0.0 0.1 A OCPSET=2MΩ Over voltage limit Input Ovl 0.96 1.00 1.04 V Detect voltage of VDET pin SBD open protect Sop 0.02 0.05 0.08 V Detect voltage of VDET pin VDET leak current OVIL - 0.1 1.0 µA LED maximum current ILMAX - - 30 mA LED current accuracy ILACCU - - ±3.0 % LED current matching ILMAT - - ±1.5 % LED current limiter ILOCP - 0 0.1 mA LED terminal Over voltage protect LEDOVP 10.0 11.5 13.0 V ISET voltage 0.5 0.6 0.7 V FSEL=L (GND short) [Protection] OCPSET=68kΩ [Current driver] *1 Iset ILED=16~20mA Each LED current/Average (LED1-6) ILED=16~20mA Current limit value at ISET resistor 1kΩ setting PWMDRV=2.5V This parameter is tested with DC measurement. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/28 2011.06 - Rev.B Technical Note BD6150MUV ●Reference Data 30 25℃ 15 10 25℃ 2 -40℃ 1.5 1 5 10 15 20 25 5 12V 4.9 4.8 -40 0 5 6V 5.1 0.5 -40℃ 0 0 22V 85℃ 2.5 ICC [mA] 20 5.2 3 85℃ VREG [V] 25 ICC [uA] 5.3 4 3.5 30 0 5 10 15 VBAT [V] 20 25 30 -20 0 VBAT [V] Fig 1. Quiescent Current Fig 2. Current Consumption 3.9 20 40 60 80 100 TEMP [℃] Fig 3. VREG Voltage 1500 620 RISING 1400 6V FREQ [kHz] 3.6 600 3.5 FALLING 3.4 -40 -20 0 20 40 60 80 590 -40 100 -20 0 98 97 20 40 60 80 1000 -40 100 20 40 TEMP [℃] Fig 5. ISET Voltage Fig 6. Switching Frequency 5V 85℃ 700 6V 94 SW_ICOIL [A] 95 500 400 300 -40℃ 100 92 -40 -20 0 20 40 60 80 0 2.4 100 3 3.6 4.2 4.8 5.4 6 Fig 8. LX NcH RON 20 40 60 80 100 0.8 0.7 VDET [ µ A] VDET[mV] VDET [V] 0 1 60 50 0.6 0.5 0.4 0.3 40 4.2V -20 0.9 4.2V, 5V, 6V 0.9 4.2V 1.8 Fig 9. Over Current Limit 70 1 2 TEMP [°C] Fig 7. Max Duty 5V, 6V 100 6V 2.2 1.4 -40 6.6 7.2 VREG [V] 1.1 80 1.6 25℃ TEMP [℃] 1.2 60 5V 200 93 0 2.4 600 96 -20 2.6 800 RON [mΩ] Max Duty [%] 1100 900 4.2V 1200 TEMP [°C] TEMP (°C) Fig 4. Under Voltage Lock Out 1300 4.2V 5V 4.2V 6V 5V 610 3.7 ISET [mV] UVLO (V) 3.8 VBAT=VREG=5V 0.2 0.1 0.8 -40 -20 0 20 40 60 80 100 TEMP [°C] Fig 10. Over Voltage Protect www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 30 -40 -20 0 20 40 60 80 100 0 -40 -20 0 20 40 60 80 100 TEMP [℃] TEMP [°C] Fig 11. SBD Open Protect Fig 12. VDET Leak Current 3/28 2011.06 - Rev.B Technical Note BD6150MUV 20 50 -40℃ 2 16 85℃ 25℃ 14 40 12 10 8 6 35 4 25℃ 5 0 -1 85℃ -2 -3 0 4 25℃ 2 85℃ 30 3 -40℃ 1 Matching [%] ILED [mA] ILED Max [mA] 45 3 -40℃ 18 6 0 7 0.2 0.4 0.6 0.8 1 Fig 13. LED Max Current Fig 14. LED Current vs LED Voltage 100 0 20 40 60 80 100 Duty [%] VLED [V] VBAT [V] Fig 15. LED Current Matching 100 -40℃ 80 70 85℃ 60 6V 10 25℃ ILED [mA] Efficiency [%] 90 12V, 26V 1 50 40 0 10 20 30 VBAT [V] Fig 16. Efficiency 10LEDx6CH www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 0.1 1 10 Duty [%] 100 Fig 17. LED Current vs PWM Duty PWM Freq=200Hz LED 10x6CH 4/28 2011.06 - Rev.B Technical Note BD6150MUV ●Block diagram VBAT VREG FAILFLAG SBD OPEN/ Output short PROTECT REG UVLO Internal Reset VDET Output Over Voltage PROTECT TSD PWMPOW FAULT DETECTOR Internal Power Supply 5.5V Clamp Soft start Internal Power Control SW LED TERMINAL OPEN/SHORT DETECTOR ERRAMP PWM COMP - Control SW SENCE LED1 LED2 LED + LED3 RETURN Current SENCE LED4 SELECT + OSC LED5 LED6 Over Current Protect 6ch PGND + - ISET Resistor driver N.C. N.C. N.C. OCPSET FSEL TEST GND PWMDRV Current Driver ISET GND Fig.18 BD6150MUV block diagram ●Application example Battery or adapter 4.2V to 26V 4.7µH 10LED× 6 parallel 2.2µF / 50V 2.2µF 10kΩ VBAT SW SW PWMPOW FAILFLAG PWM PWMDRV LED1 BD6150MUV TEST LED2 LED3 FSEL LED4 LED5 LED6 ISET GND GND OCPSET PGND 10kΩ N.C. N.C. 68kΩ VDET 26.7kΩ VREG PGND Vin=2.1V to 5.5V f PWM =100Hz~ 1kHz 1MΩ 1µF N.C. 22kΩ 19.6mA Fig.19 Application example (10LED × 6parallel, Switching frequency 750kHz) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/28 2011.06 - Rev.B Technical Note BD6150MUV ●Pin assignment table PIN PIN Name No. In/ Out Function Terminal diagram SW Out Switching Tr drive terminal H 2 SW Out Switching Tr drive terminal H 3 N.C. - No connect pin F 4 PGND - PGND for switching Tr D 5 FAILFLAG Out Fail Flag C 6 OCPSET In Current Limiter setting A 7 VDET In Detect input for SBD open and OVP A 8 TEST In TEST signal J 9 FSEL In Selection of Frequency, ‘L’: 1.25MHz, ‘H’: 0.75MHz J 10 ISET In Resister connection for LED current setting A 11 GND - GND for Switching Regulator B 12 N.C. In No connect pin F 13 LED1 In Current sink for LED C 14 LED2 In Current sink for LED C 15 LED3 In Current sink for LED C 16 LED4 In Current sink for LED C 17 LED5 In Current sink for LED C 18 LED6 In Current sink for LED C 19 N.C. In No connect pin F 1 20 GND - GND for Current driver B 21 PWMDRV In PWM input pin for power ON/OFF only driver G 22 VREG Out Regulator output / Internal power-supply D 23 PWMPOW In PWM input pin for power ON/OFF E 24 VBAT In Battery input I VBAT VBAT VREG VBAT PIN PIN GND PIN PIN PGND A GND GND C B D VBAT VBAT PIN PIN PIN PIN 5.5V Clump PGND GND GND E F VBAT G H VREG PIN PIN GND PGND I www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. GND J 6/28 2011.06 - Rev.B Technical Note BD6150MUV ●Description of Functions 1) PWM current mode DC/DC converter While this IC is power ON, the lowest voltage of LED terms is detected, PWM duty is decided to be 0.7V and output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode, one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls internal Nch Tr via the RS latch. In the period where internal Nch Tr gate is ON, energy is accumulated in the external inductor, and in the period where internal Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD. This IC has many safety functions, and their detection signals stop switching operation at once. 2) Soft start This IC has soft start function. The soft start function prevents large coil current. Rush current at turning on is prevented by the soft start function. After PWMPOW, PWMDRV is changed L H, soft start becomes effective for within 4ms and soft start doesn't become effective even if PWMPOW is changed L H after that. And, when the H section of PWMPOW is within 4ms, soft start becomes invalid when PWMPOW is input to H more than three times. The invalid of the soft start can be canceled by making PWMPOW, PWMDRV L. PWMDRV PWMPOW PWMPOW VREG Max 1ms Max 3ms Soft start VREG Soft start OFF OFF ON OFF Soft start reset Fig.20 Soft start 3) OFF ON OFF ON OFF OFF OFF ON OFF Reset Reset Fig.21 Soft start reset and set FAILFLAG When the error condition occurs, boost operating is stopped by the protection function, and the error condition is outputted from FAILFLAG. After power ON, when the protection function is operating under about 1ms have passed. Object of protect function is as shown below. ・Over-voltage protection ・External SBD open detect/ Output Short protection ・LED terminal open/short protection ・Over current limit PWMPOW FAILFLAG Protection function Boost operating about 1ms un-detection off normal detect boost stop un-detection normal off normal Fig.22 FAILFLAG operating description www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/28 2011.06 - Rev.B Technical Note BD6150MUV ●Protection ・Over voltage protection At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop. At this moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And, when the Feedback of LED1 isn’t returned, so that Vout will return normal voltage. Vout LED1 voltage LED1 connection normal open normal LED2 connection LED1 FeedBack return off return PWMPOW, PWMDRV Fig.23 VDET operating description ・External SBD open detect / Output short protection In the case of external SBD is not connected to IC, or VOUT is shorted to GND, the coil or internal Tr may be destructed. Therefore, at such an error as VDET becoming 0.05V or below, and turns off the output Tr, and prevents the coil and the IC from being destructed. And the IC changes from activation into non-activation, and current does not flow to the coil (0mA). ・Thermal shut down This IC has thermal shut down function. The thermal shut down works at 175℃ or higher, and the IC changes from activation into non-activation. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/28 2011.06 - Rev.B Technical Note BD6150MUV ●How to set over voltage limit This section is especially mentioned here because the spec shown electrical characteristic is necessary to explain this section. Over voltage limit LED control voltage LED terminal over voltage protect min 0.96V typ 1.00V max 1.04V min 0.56V typ 0.70V max 0.84V min 10.0V typ 11.5 V max 13.0V 1. Calculate the conditions that the total value of LED VF is MAX. Example) In the case of serial 8 LEDs with VF=2.9V(min), 3.2V(typ), 3.5V(max) => 3.5V x 8=28V 2. Then calculate the biggest value of output with the following formula. The biggest value of output = the biggest value calculated for 1 + the biggest value of LED terminal voltage. (0.84V) Example) The biggest value of output = 28V + 0.84V =28.84V 3. Set the smallest value of over voltage larger than the biggest value of output. If over voltage is closer to the total value of VF, it could be occurred to detect over voltage by ripple, noise, and so on. It is recommended that some margins should be left on the difference between over voltage and the total value of VF. This time around 6% margin is placed. Example) Against the biggest value of output = 28.84V, the smallest value of over voltage = 28.84V x 1.06 = 30.57V Ic over voltage limit min=0.96V,typ=1.00V, max=1.04V typ = 30.57V×(1.00V/0.96V) = 31.8V max = 31.8V×(1.04V/1.00V) = 33.1V 4. The below shows how to control resistor setting over voltage Please fix resistor 2.2MΩ between VDET and output and then set over voltage after changing resistor between VDET and GND. While PWM is off, output voltage decreases by minimizing this resistor. Due to the decrease of output voltage, ripple of output voltage increases, and singing of output condenser also becomes bigger. Example) Selecting OVP resistor. (Example 1) VF=3.6V max, serial = 7 LED OVP = 1.0V, R1 = 2.2MΩ, R2 = 78.7kΩ VOUT VOUT = 1.0 × (2.2MΩ + 78.7kΩ)/ 78.7kΩ = 28.95V (Example 2) VF=3.6V max, serial = 8 LED OVP = 1.0V, R1 = 2.2MΩ, R2 = 69.8kΩ R1 VOUT = 1.0 × (2.2MΩ + 69.8kΩ)/ 69.8kΩ = 32.52 (Example 3) VF=3.6V max, serial = 9 LED VDET OVP = 1.0V, R1 = 2.2MΩ, R2 = 62kΩ R2 VOUT = 1.0 × (2.2MΩ + 62kΩ)/ 62kΩ = 36.48V (Example 4) VF=3.6V max, serial = 10 LED OVP = 1.0V, R1 = 1.0MΩ, R2 = 26.7kΩ VOUT = 1.0 × (1.0MΩ + 26.7kΩ)/ 26.7kΩ = 38.45V 5. The following shows how to confirm if LEDs are not turned on while selecting terminals. If the difference between the VF’s total value of LED and over voltage is less than min.10V of LED terminal over voltage protect, LEDs should be turned on. LEDs are turned on, as the following formula shows; 33.1V-2.9V x 8 serial = 9.9V<10.0V. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/28 2011.06 - Rev.B Technical Note BD6150MUV ・Over Current Limit Over current flows the current detection resistor that is connected to internal switching transistor source and between PGND, Current sense voltage turns more than detection voltage decided with OCPSET, over current protection is operating and it is prevented from flowing more than detection current by reducing ON duty of switching Tr without stopping boost. As over current detector of This IC is detected peak current, current more than over current setting value does not flow. And, over current value can decide freely by changing OCPSET voltage. The range of over current setting is from 0.5A to 2.5A. Current Sence + detect - <Derivation sequence of detection resistor> OCPSET R (OCPSET)=34kΩ×Over current setting R(OCPSET) Fig. 24 Architecture TYP value of over current is 2A, MIN = 1.4A and MAX = 2.6A and after the current value which was necessary for the normal operation was decided, detection resistor is derived by using MIN value of over current detection value. For example, detection resistor when typ value was set at 2A is given as shown below. Detection resistor =34kΩ×2A=68kΩ MAX current dispersion of this detection resistor value is MAX current = 2A×1.3=2.6A For example, 34kΩ 1A, 68kΩ 2A <The estimate of the current value which need for the normal operation > As over current detector of This IC is detected the peak current, it have to estimate peak current to flow to the coil by operating condition. In case of, ○ Supply voltage of coil = VIN ○ Inductance value of coil = L ○ Switching frequency = fsw MIN=1.0MHz, Typ=1.25MHz, MAX=1.5MHz ○ Output voltage = VOUT ○ Total LED current = IOUT ○ Average current of coil = Iave ○ Peak current of coil = Ipeak ○ Efficiency = eff ○ ON time of switching transistor = Ton Ipeak = (VIN / L) × (1 / fsw) × (1-(VIN / VOUT)) Iave=(VOUT × IOUT / VIN) / eff Ton=(Iave × (1-VIN/VOUT) × (1/fsw) × (L/VIN) × 2)1/2 Each current is calculated. As peak current varies according to whether there is the direct current superposed, the next is decided. (1-VIN/VOUT) × (1/fsw) < Ton peak current = Ipeak /2 + Iave (1-VIN/VOUT) × (1/fsw) > Ton peak current = (VIN / L) ×Ton (Example 1) In case of, VIN=6.0V, L=4.7µH, fsw=1.25MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (6.0V / 4.7µH) × (1 / 1.25MHz) × (1-(6.0V / 39V)) =0.86A Iave = (39V × 80mA / 6.0V) / 85% = 0.61A 1/2 Ton = (0.61A × (1-6.0V / 39V) × (1 / 1.25MHz) × (4.7µH /6.0V) × 2) = 0.81µs (1-VIN/VOUT) × (1/fsw)=0.68µs < Ton Peak current = 0.68A/2+0.61A = 1.04A (Example 2) In case of, VIN=12.0V, L=4.7µH, fsw=1.25MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (12.0V / 4.7µH) × (1 / 1.25MHz) × (1-(12V / 39V)) =1.41A Iave = (39V × 80mA / 12.0V) / 85% = 0.31A Ton = (0.31A × (1-12 V / 39V) × (1 / 1.25MHz) × (4.7µH /12V) × 2)1/2 = 0.36µs (1-VIN/VOUT) × (1/fsw)=0.55µs > Ton Peak current = 12V/4.7µH × 0.36µs = 0.92A * When too large current is set, output overshoot is caused, be careful enough because it is led to break down of the IC in case of the worst. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/28 2011.06 - Rev.B Technical Note BD6150MUV ・soft start of Over current limit for application When the capacitor of OCPSET is set as figure, over current limit can become setting value slowly. This effect is same as internal soft start. When you want to reduce peak current than internal soft start on start up, this way is effective. But, this action repeat when the timing that PWMPOW change L to H, so to do PWM control with PWMPOW terminal, rise time of over current limit must be set into Hi time of PWM control, and please don’t connect the capacitor. Show example of rising wave form with OCPSET 330pF. Current Sence PWMPOW + - VOUT Detect OCPSET OCPSET R(OCPSET) 36m Coil current Fig.25 1.5A Rising wave form with VBAT=5V, 6parallel 10serial 20mA/ch, OCPSET=68kΩ,330pF www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/28 2011.06 - Rev.B Technical Note BD6150MUV ●Operating of the application deficiency 1) When 1 LED or 1string OPEN during the operating The LED string that became OPEN isn't lighting, but other LED strings are lighting. Then LED terminal is 0V, output boosts up to the over voltage protection voltage. When over voltage is detected, the feedback of open string isn’t returned, so that VOUT will return normal voltage. In the case that the voltage of 2 LED terminals becomes more than 25V(Absolute maximum ratings) as VOUT boosts up to the over voltage protection voltage, please pay attention carefully that 2 LED terminals could be broken up in setting over voltage protection. OVP setting when selecting terminals Vout Over voltage protection voltage 40 LED1 voltage 35 LED2 voltage 30 LED 1 connection 25 20 LED1 LED2 Setting range of over voltage protection 15 normal LED 1 feedback 10 open normal LED connection return off return PWMPOW, PWMDRV 5 LED 1current 0 10 20 30 LED Vf (Vout) 40 20mA LED 2 current 0mA 20mA Fig.26 LED OPEN detect Moreover, excessively high level of over voltage limit in terminal setting makes it happen that LED terminal voltage exceeds LED terminal over voltage protect, which accordingly turn off LED lights. In order to prevent this problem, please see “How to set the external resistor of over voltage limit (p.7)” and then set over voltage referring to application. 2) When LED short-circuited in the plural All LED strings is turned on unless LED1~6 terminal voltage is more than 11.5V. When it was more than 11.5V only the strings which short-circuited is turned off normally and LED current of other lines continue to turn on. LED terminal voltage 40 LED short-circuited LED short LED1 12.7V 35 30 25 0.7V LED2 20 Vout 15 Voltage range of LED short-circuited 10 LED 1 LED 2 5 0 10 20 30 40 I LED1 20mA I LED2 20mA LED 1 FeedBack normal LED Vf (Vout) 0mA cut Fig.27 LED short detect 3) When Schottky diode comes off IC and a switching transistor aren't destroyed because boost operating stops by the Schottky diode coming off protected function. 4) When the resistor of over current detection comes off All the LEDs do not turn on due to open protect of the OVP resistor, which stops boost operation and consequently prevents passing LED current. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/28 2011.06 - Rev.B Technical Note BD6150MUV ●How to activate Please pay attention to the following when activating. 1. The lights are turned off by LED terminal over voltage protection in the case that LED terminal voltage is more than 11.5V(typ) at PWMDRV=H. LED terminal becomes more than 11.5V depending on OVP setting. In that case, please refer to how to set on P7. 2. In the case that capacitors are placed between anode and casode, LED terminal might become more than 11.5V depending on power supply activating time. Please make t12 in Fig.28 long enough until LED terminal becomes less than 11.5V. or use application. 3. If PWMPOW and PWMDRV terminal voltage become more than VBAT voltage in the case that activation of power supply voltage (VBAT) is not completely finished, error might be occurred by supplying power supply into VBAT via ESD protection diode on the VBAT side of each terminal. Fig.28 shows input timing of VBAT, PWMPOW, and PWMDRV. Please input signal paying attention to the above. In the case that conditions are not good enough, it happens that lights are turned off at activation. Terminal select circuit inside IC operates using VREG as power supply. In the case that VREG does not activate (less than UVLO), please set PWMDRV=H t12 hours after setting PWMPOW=H. Terminal select circuit is reset by PWMDRV=L signal while VREG rises after PWMPOW=L->H. Lights might be turned off unless PWMDRV=L is input until VREG becomes stable at activation. After activation, VREG voltage is more than UVLO, reset is not needed since terminal information is saved. At light dimming of PWMDRV terminal t1 VBAT H[V] H[V] L[V] t2 t4 t3 t5 t3 PWMPOW t6 VREG t7 t8 t9 t16 t14 t14 PWMDRV t10 t11 t15 At light dimming of PWMPOW terminal t1 VBAT L[V] H[V] H[V] t2 t3 t4 t3 t13 t5 PWMPOW t6 t12 VREG UVLO t7 t15 t16 t14 t14 PWMDRV t9 t10 Fig.28 input timing t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 H L Name Power supply activating time Power supply-PWMPOW time PWMPOW rising time PWMPOW falling time PWMPOW low time Power supply-PWMDRV time PWMDRV rising time PWMDRV high time PWMDRV falling time PWMDRV low time PWMDRV cycle PWMPOW cycle PWMPOW high time PWMPOW(H)->PWMDRV(H) time PWMPOW(L)->PWMDRV(L) time PWMDRV(L)->PWMPOW(L) time Operation Voltage Non operation voltage www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. Unit µs µs µs µs µs µs µs µs µs µs µs µs µs µs µs µs V V Min. 100 0 0 0 50 1600 0 5 0 5 40 1000 50 1500 0 0 4.2 - Typ. 5000 5000 12 - 13/28 Max. 100 100 100 100 10000 10000 26 4.2 0V VBAT 10kΩ 5V PIN Rin GND Fig.29 Example of application at control signal voltage > VBAT voltage 2011.06 - Rev.B Technical Note BD6150MUV ●Start control (PWMPOW) and select LED current driver (PWMDRV) This IC can control the IC system by PWMPOW, and IC can power off compulsory by setting 0.9V or below. Also, It powers on PWMPOW is at more than 2.1V. After it’s selected to PWMPOW=H, When it is selected at PWMDRV=H, LED current decided with ISET resistance flow. Next, When it is selected at PWMDRV=L, LED current stop to flow. PWMPOW PWMDRV IC LED current L L Off OFF H L On OFF L H Off OFF H H On Current decided with ISET ●How to select the number of LED lines of the current driver When the number of LED lines of the current driver is reduced, the un-select can be available by setting the unnecessary LED1~6 terminals OPEN. In the case of using 4 lines and so on, please connect the unnecessary 2 lines OPEN. Then please set PWMPOW and PWMDRV “H” and finish selecting the lines within the process of softstart. If the level of over voltage limit is set too high, the connected LED lines exceed LED terminal over voltage protect and are judged as unnecessary lines. Please make it sure referring “How to set over voltage limit (p.7)”. Additionally, once the terminals are judged as unnecessary, this information never can be reset without setting PWMPOW and PWMDRV “L”. ●LED current setting range LED current can set up Normal current by resistance value (RISET) connecting to ISET voltage. Setting of each LED current is given as shown below. Normal current = 16mA(27kΩ/RISET) Also, Normal current setting range is 10mA~30mA. LED current becomes a leak current MAX 2µA at OFF setting. When using beyond current setting range, please be careful that the error in LED current setting could be large. ISET Normal current setting example RISET LED current 18kΩ (E24) 24.0mA 22kΩ (E24) 19.6mA 24kΩ (E24) 18.0mA 27kΩ (E24) 16.0mA 30kΩ (E24) 14.4mA 33kΩ (E24) 13.1mA ●Brightness control There are two dimming method is available, first method is analog dimming that apply analog voltage to ISET terminal, and second method is PWM control via digital dimming of PWMPOW or PWMDRV. Because each method has the different merit, please choose a suitable method for the application of use. Two techniques can be used as digital dimming by the PWM control One is PWM control of current driver, the other is PWM control of power control. As these two characteristics are shown in the below, selects to PWM control process comply with application. ・Efficiency emphasis in the low brightness which has an influence with the battery life 2) Power control PWM control ・LED current dispersion emphasis in the PWM brightness control 1) Current driver PWM control (Reference) Efficiency of LED current 0.5mA PWM frequency 200Hz PWM regulation process (PWM Duty=2.5%) Limit dispersion capability of low duty Current driver 74.8% 0.04% Power control 91% 0.40% www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/28 2011.06 - Rev.B Technical Note BD6150MUV 1) Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Fig.30. The current set up with ISET is chosen as the H section of PWMDRV and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMDRV signal. This method that it lets internal circuit and DC/DC to work, because it becomes to switch the driver, the current tolerance is a few when the PWM brightness is adjusted, so it makes it possible to brightness control until 5µs (MIN0.1% at 200Hz). And, don't use for the brightness control, because effect of ISET changeover is big under 1µs ON time and under 1µs OFF time. Typical PWM frequency is 100Hz~25kHz. PWMDRV ON OFF LED current ON OFF Coil current ON OFF IC’s active current ON Fig.30 PWMDRV sequence 2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Fig.31. The current setting set up with PWMDRV logic is chosen as the H section and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMPOW signal. This method is, because IC can be power-off at off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it possible to brightness control until 50µs (MIN1% at 200Hz). And, don't use for the brightness control, because effect of power ON/OFF time changeover is big under 50µs ON time and under 50µs OFF time. Typical PWM frequency is 100Hz~1kHz. PWMPOW ON OFF LED current ON OFF Coil current ON OFF IC’s active current ON OFF Fig.31 PWMPOW sequence ●Output voltage ripple for PWM dimming Conditio： 8serial 6parallel, LED current=20mA/ch, VBAT=7V, Ta=25℃, output capacitor=2.2μF(50V/B3) PWMDRV Lower ripple Voltage (under 200mV) Output Voltage (AC) 780mA Input Current 1ms/div. Fig.32 Output voltage ripple for PWM dimming www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/28 2011.06 - Rev.B Technical Note BD6150MUV ●LED current rise and fall for PWM dimming Conditions： 8serial 6parallel, LED current=20mA/ch, VBAT=7V, Ta=25℃, output capacitor=2.2μF(50V/B3) PWMDRV PWMDRV Output Voltage Output Voltage 114ns 624ns LED Current 400ns/div. PWMDRV(ta 25, Frequency 200Hz, LED 10x6ch) LED current vs Duty 100 PWMPOW (ta 25, Frequency 200Hz LED 10x6ch) LED current vs Duty 100 10 10 LED current[mA] L E D c urre nt[m A ] 40ns/div. LED Current 1 0.1 12V 6V 26V 0.01 1 10 0.1 12V 6V 26V 0.01 0.001 0.1 1 0.001 100 0.1 duty[%] 1 10 100 Duty[%] Fig.33 PWM characteristics of current driver PWM Fig.34 PWM characteristics of power control PWM ●Main characteristics of efficiency Conditions： 10serial 6parallel, LED current=20mA/ch, output capacitor=2.2μF(50V/B3) 100 -40℃ Efficiency [%] 90 80 85℃ 25℃ 70 60 50 5 10 15 20 25 30 VBAT [V] efficiency for PWMPOW Control VBAT=12V Ta=25℃ 100% 90% 90% 80% 80% 70% 70% 60% 60% Efficiency Efficiency Efficiency vs duty (10serial x 6strings) 100% 50% 40% 50% 40% 30% 30% 20% 20% 10% 10% 0% 0% 0 0 10 20 30 40 50 60 PW M Duty[%] Fig.35 Efficiency of current driver PWM www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10 20 30 40 50 60 70 80 90 100 70 80 90 100 PWM Duty(%) Fig.36 Efficiency of power control PWM 16/28 2011.06 - Rev.B Technical Note BD6150MUV ●The coil selection The DC/DC is designed by more than 4.7µH. When L value sets to a lower value, it is possibility that the specific sub-harmonic oscillation of current mode DC / DC will be happened. Please do not let L value to 3.3µH or below. And, L value increases, the phase margin of DC / DC becomes to zero. Please enlarge the output capacitor value when you increase L value. Example) 4.7µH = output capacitor 2.2µF/50V 1pcs 6.8µH = output capacitor 2.2µF/50V 2pcs 10µH = output capacitor 2.2µF/50V 3pcs This value is just examples, please made sure the final judgment is under an enough evaluation. ●The separation of the IC power supply and coil power supply This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 26V. That application is shown in below Fig.14. The higher voltage source is applied to the power source of coil that is connected from 4.2V to 5.5V into IC VBAT, please follow the recommend design in Fig.14. It connects VBAT terminal and VREG terminal together at IC outside. When the coil power supply is applied, it is no any problem even though IC power supply is the state of 0V. Although IC power supply is set to 0V, pull-down resistance is arranged for the power off which cuts off the leak route from coil power supply in IC inside, the leak route is cut off. And, there is no power on-off sequence of coil power supply and IC power supply. Battery or adapter Battery or adapter Battery or adapter Battery 4.2V to 30V 4.2V to 26V 4.2V to 30V 4.2V to 5.5V 10µF FSEL N.C. LED2 TEST LED3 FSEL 68kΩ VBAT FAILFLAG 10kΩ VDET N.C. BD6150MUV LED1 LED2 LED3 LED4 OCPSET N.C. 27kΩ SW VREG LED1 LED6 ISET GND PWMPOW PWMDRV LED5 GND PGND 10kΩ LED4 OCPSET 68kΩ PWM N.C. BD6150MUV TEST Vin=2.1V to 5.5V fPWM=100Hz~1kHz LED5 16mA LED6 ISET N.C. 1µF PGND GND PWMDRV VDET 2.2µF GND SW SW PWMPOW VBAT 10kΩ FAILFLAG PWM VREG Vin=2.1V to 5.5V fPWM=100Hz~1kHz 10kΩ 9LED × 6parallel 2.2µF / 50V 2.2MΩ 69.8kΩ 1µF PGND 2.2MΩ 69.8kΩ 2.2µF / 50V 1µF 4.7µH 9LED × 6parallel SW 4.7µH PGND 10µF N.C. 27kΩ 16mA Fig.37 Application at the time of power supply isolation (6parallel) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/28 2011.06 - Rev.B Technical Note BD6150MUV ●Selection of external parts Recommended external parts are as shown below. When to use other parts than these, select the following equivalent parts. ・Coil A915AY-4R7M Vertical 5.2 Size Horizontal 5.2 Height (MAX) 3.0 TOKO B1015AS-4R7M 8.4 8.3 TDK LTF5022T-4R7N2R0-LC 5.0 5.2 10μH TOKO A915AY-100M 5.2 10μH TDK LTF5022T-100M1R4-LC Value Manufacturer Product number 4.7μH TOKO 4.7μH 4.7μH DC current (mA) DCR (Ω) 1870 0.045 4.0 3300 0.038 2.2 2000 0.073 5.2 3.0 1870 0.090 5.0 5.2 2.2 1400 0.140 Vertical Size Horizontal Height TC Capa Tolerance ・Capacitor Value Pressure Manufacturer Product number [ Supply voltage capacitor ] 2.2μF 10V MURATA GRM188B31A225K 1.6 0.8 0.8±0.1 B +/-10% 4.7μF 25V MURATA GRM319R61E475K 3.2 1.6 0.85±0.1 X5R +/-10% 4.7μF 25V MURATA GRM21BR61E475K 2.0 1.25 1.25±0.1 X5R +/-10% 10μF 25V MURATA GRM31CB31E106K 3.2 1.6 1.6±0.2 B +/-10% 10μF 10V MURATA GRM219R61A106K 2.0 1.25 0.85±0.15 X5R +/-10% [ Smoothing capacitor for built-in regulator ] 1μF 10V MURATA GRM188B10J105K 1.6 0.8 0.8±0.1 B +/-10% 4.7μF 10V MURATA GRM219B31A475K 2.0 1.25 0.85±0.1 B +/-10% [ Output capacitor ] 1μF 50V MURATA GRM31MB31H105K 3.2 1.6 1.15±0.1 B +/-10% 1μF 50V MURATA GRM21BB31H105K 2.0 1.25 1.25±0.1 B +/-10% 2.2μF 50V TDK C3225JB1H225K 3.2 2.5 2.0±0.2 B +/-10% 2.2μF 50V MURATA GRM31CB31H225K 3.2 1.6 1.6±0.2 B +/-10% 0.33μF 50V MURATA GRM219B31H334K 2.0 1.25 0.85±0.1 B +/-10% Size Horizontal 0.8 Height 0.45 ・Resistor Value Tolerance Manufacturer Product number 10kΩ ±0.5% ROHM MCR03EZPD1002 Vertical 1.6 15kΩ ±0.5% ROHM MCR03EZPD1502 1.6 0.8 0.45 18kΩ ±0.5% ROHM MCR03EZPD1802 1.6 0.8 0.45 22kΩ ±0.5% ROHM MCR03EZPD2202 1.6 0.8 0.45 24kΩ ±0.5% ROHM MCR03EZPD2402 1.6 0.8 0.45 27kΩ ±0.5% ROHM MCR03EZPD2702 1.6 0.8 0.45 30kΩ ±0.5% ROHM MCR03EZPD3002 1.6 0.8 0.45 33kΩ ±0.5% ROHM MCR03EZPD3302 1.6 0.8 0.45 56kΩ ±0.5% ROHM MCR03EZPD5602 1.6 0.8 0.45 62kΩ ±0.5% ROHM MCR03EZPD6202 1.6 0.8 0.45 68kΩ ±0.5% ROHM MCR03EZPD6802 1.6 0.8 0.45 75kΩ ±0.5% ROHM MCR03EZPD7502 1.6 0.8 0.45 2.2MΩ ±0.5% ROHM MCR03EZPD2204 1.6 0.8 0.45 Pressure Manufacturer Product number 60V ROHM RB160M-60 Vertical 3.5 Size Horizontal 1.6 Height 0.8 ・SBD The coil is the part that is most influential to efficiency. Select the coil whose direct current resistor (DCR) and current inductance characteristic is excellent. BD6xxx is designed for the inductance value of 4.7µH. Don’t use the inductance value. less than 3.3μH. Select a capacitor of ceramic type with excellent frequency and temperature characteristics. Further, select Capacitor to be used with small direct current resistance, and pay sufficient attention to the PCB layout. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/28 2011.06 - Rev.B Technical Note BD6150MUV ●PCB Layout In order to make the most of the performance of this IC, its PCB layout is very important. Characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. Battery or adapter 4.2V to 26V CVL1 10µF 4.7µH 10LED × 6parallel 2.2µF / 50V CO1 1µF CVB1 VBAT SW SW PWMPOW FAILFLAG 10kΩ PWM N.C. BD6150MUV TEST LED2 LED4 OCPSET LED6 ISET GND LED5 GND PGND LED1 LED3 FSEL 68kΩ ROC 10kΩ RVD PWMDRV N.C. VDET RVT 26.7kΩ Vin=2.1V to 5.5V fPWM=100Hz~1kHz VREG PGND 1MΩ 2.2µF CVR3 N.C. 22kΩ RISET 19.6mA Fig. 38 PCB Layout <Input capacitor CVL1 (10μF) for coil> Connect input capacitor CVL1 (10μF) as close as possible between coil L1 and PGND. <Input bypath capacitor CVB1 (1μF) for IC> Put input bypath capacitor CVB1 (1μF) as close as possible between VBAT and PGND pin. <Smoothing capacitor CVR3(2.2uF) of the regulator> Connect smoothing capacitor CVR3(2.2μF) as close as possible between VREG pin and PGND. <Schottky barrier diode SBD> Connect schottky barrier diode SBD as close as possible between coil1and SW pin. <Output capacitor CO1> Connect output capacitor CO1 between cathode of SBD and PGND. Make both PGND sides of CVL1 and CO1 as close as possible. <LED current setting resistor RISET(22kΩ)>> Connect LED current setting resistor RISET(22kΩ) as close as possible between ISET pin and GND. There is possibility to oscillate when capacity is added to ISET terminal, so pay attention that capacity isn't added. <Over current limit setting resistor ROC(68kΩ)> Connect Over current limit setting resistor ROC(68kΩ) as close as possible between OCPSET pin and GND. < Over current limit setting resistor RVT(2.2MΩ) & RVD(56kΩ)> Put over current limit setting resistor RVT(2.2MΩ) & RVD(56kΩ) as close as possible VDET pin so as not to make the wire longer, which possibly causes the noise and also detects over voltage protection by mistake. <Connect to GND and PGND> GND is analog ground, and PGND is power ground. PGND might cause a lot of noise due to the coil current of PGND. Try to connect with analog ground, after smoothing with input capacitor CVL1 and output capacitor CO1. <Heat radiation of back side PAD> PAD is used for improving the efficiency of IC heat radiation. Solder PAD to GND pin (analog ground). Moreover, connect ground plane of board using via as shown in the patterns of next page. The efficiency of heat radiation improves according to the area of ground plane. <Others> When those pins are not connected directly near the chip, influence is give to the performance of BD6150, and may limit the current drive performance. As for the wire to the inductor, make its resistance component small so as to reduce electric power consumption and increase the entire efficiency. The layout pattern in consideration of these is shown in the next page. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/28 2011.06 - Rev.B Technical Note BD6150MUV ●Recommended PCB layout pattern L1 4.7µH C_VR3 2.2µF/10V SBD 60V 4R7 C_VB1 2.2µF/25V 76 C_VL1 10µF/25V U1 BD6150MUV D6150 CO1 2.2µF/50V R_VD 26.7kΩ R_OC 56kΩ R_VT 1 MΩ R_ISET 22kΩ Top Layer Mid layer 1 Mid layer 2 Bottom layer Fig. 39 PCB layout patterns ●About heat loss In heat design, operate the DC/DC converter in the following condition. (The following temperature is a guarantee temperature, so consider the margin.) 1. Ambient temperature Ta must be less than 85℃. 2. The loss of IC must be less than dissipation Pd. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/28 2011.06 - Rev.B Technical Note BD6150MUV ●Application example ・LED current setting controlled ISETH resistor. 21.5kΩ : 20.1mA 27.0kΩ : 16.0mA 14.7kΩ : 29.59mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristics p.3 and function (p.12). 15inch panel Battery or adapter Battery or adapter LED ON/OFF N.C. BD6150MUV FSEL TEST LED3 FSEL N.C. 10kΩ fPWM=100Hz~25kHz LED2 TEST LED3 FSEL 16mA VBAT FAILFLAG SW VBAT BD6150MUV 10kΩ LED1 LED2 LED3 LED4 LED5 ISET LED6 N.C. 27kΩ Fig.42 10 series×6parallel, LED current 16mA setting Switching frequency 750kHz setting example Current driver PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 68kΩ VDET N.C. OCPSET 330pF N.C. 27kΩ SW PWMDRV N.C. LED6 ISET GND PWMPOW FAILFLAG 10kΩ （Enable） LED1 LED5 GND PGND LED ON/OFF LED4 OCPSET 68kΩ 1µF PGND GND BD6150MUV 10LED × 6parallel 2.2µF / 50V 2.2µF PWM N.C. FSEL 330pF VDET 10kΩ 4.7µH SW VBAT FAILFLAG SW SW VREG TEST 16mA 26.7kΩ PWMDRV N.C. N.C. 1MΩ 1µF 26.7kΩ fPWM=100Hz~25kHz PWMPOW 10µF 10LED × 6parallel 1MΩ PWM 10kΩ LED6 Fig.41 10 series×6 parallel, LED current16mA, Switching frequency 1250kHz example Power control PWM application VREG 4.7µH PGND 10kΩ LED5 Battery or adapter 2.2µF / 50V （Enable） LED4 27kΩ Battery or adapter LED ON/OFF LED2 LED3 16mA Fig.40 10 series×6parallel, LED current 16mA setting Switching frequency 750kHz setting example Power control PWM application 2.2µF BD6150MUV PGND LED6 ISET GND 68kΩ 27kΩ 10µF LED1 OCPSET LED5 GND PGND LED2 LED4 OCPSET 68kΩ N.C. 10kΩ N.C. （like Enable） LED1 GND TEST VDET PWMDRV ISET （like Enable） PWMPOW 10kΩ GND PWMDRV N.C. 10kΩ PWM SW VBAT FAILFLAG SW SW VREG PWMPOW fPWM=100Hz~1kHz 26.7kΩ LED ON/OFF 10kΩ 1µF PGND 1MΩ 10kΩ PWM VDET 10LED × 6parallel 2.2µF / 50V 2.2µF 26.7kΩ fPWM=100Hz~1kHz 10kΩ 1MΩ 1µF PGND 4.7µH GND 2.2µF / 50V 2.2µF 10µF 10LED × 6parallel VREG 4.7µH PGND 10µF 16mA Fig.43 10 series×6parallel, LED current 16mA setting Switching frequency 1250kHz setting example Current driver PWM application 21/28 2011.06 - Rev.B Technical Note BD6150MUV 13~14inch panel Battery or adapter Battery or adapter BD6150MUV TEST FSEL 10kΩ fPWM=100Hz~25kHz N.C. LED2 TEST LED3 FSEL 330pF N.C. 16mA 27kΩ 56kΩ VBAT FAILFLAG SW BD6150MUV 10kΩ LED1 LED2 LED3 LED4 LED5 LED6 N.C. 27kΩ Fig.44 8series× 6paralell LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application VDET N.C. OCPSET LED6 ISET GND PWMPOW PWMDRV LED1 LED5 GND PGND PWM LED4 OCPSET 56kΩ 10kΩ （Enable） ISET N.C. LED ON/OFF N.C. （like Enable） 1µF PGND GND PWMDRV 2.2µF GND PWMPOW 10kΩ VBAT FAILFLAG SW SW VREG 10kΩ PWM LED ON/OFF VDET 10kΩ 8LED × 6parallel 2.2µF / 50V SW 1µF PGND 4.7µH 2.2MΩ 69.8kΩ 2.2µF 2.2MΩ 69.8kΩ 2.2µF / 50V fPWM=100Hz~1kHz 10µF 8LED × 6parallel VREG 4.7µH PGND 10µF 16mA Fig.45 8series×6paralell, LED current 16mA setting, Switching frequency 1250kHz setting example Current driver PWM application 10~12inch panel Battery or adapter 10µF 4.7µH 7LED × 6parallel 2.2µF 1µF PWM LED ON/OFF 10kΩ VBAT SW PWMPOW FAILFLAG 10kΩ SW fPWM=100Hz~1kHz VREG PGND PWMDRV TEST BD6150MUV LED2 LED4 OCPSET LED6 ISET GND LED5 GND PGND LED1 LED3 FSEL 47kΩ 10kΩ N.C. （like Enable） N.C. VDET 2.2MΩ 78.7kΩ 2.2µF / 50V N.C. 27kΩ 16mA Fig.46 7series×6parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/28 2011.06 - Rev.B Technical Note BD6150MUV 7inch panel Battery or adapter FSEL N.C. LED2 TEST LED3 FSEL 39kΩ LED6 ISET GND GND VBAT SW BD6150MUV N.C. 16mA 27kΩ LED1 LED2 LED4 LED5 LED6 N.C. 27kΩ Fig.47 8series×3parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application 10kΩ LED3 OCPSET LED5 VDET N.C. （like Enable） LED1 LED4 OCPSET PWMPOW PWMDRV ISET BD6150MUV TEST 10kΩ FAILFLAG 10kΩ PWM GND N.C. PGND fPWM=100Hz~1kHz N.C. （like Enable） 1µF PGND LED ON/OFF PWMDRV 39kΩ 2.2µF SW VBAT SW PWMPOW VDET 6LED × 4parallel 2.2µF / 50V GND 10kΩ FAILFLAG 10kΩ PWM LED ON/OFF SW VREG fPWM=100Hz~1kHz 10kΩ 4.7µH 2.2MΩ 69.8kΩ 1µF PGND 2.2MΩ 69.8kΩ 2.2µF / 50V 2.2µF 10µF 8LED × 3parallel VREG 4.7µH PGND 10µF Battery or adapter 16mA Fig.48 6series×4parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application Battery or adapter 10µF 4.7µH 8LED × 3parallel 2.2µF 1µF LED ON/OFF 10kΩ VBAT SW PWMPOW FAILFLAG 10kΩ PWM SW fPWM=100Hz~1kHz VREG PGND VDET PWMDRV N.C. （like Enable） N.C. TEST BD6150MUV LED2 LED4 OCPSET ISET GND LED5 GND PGND LED1 LED3 FSEL 56kΩ 10kΩ 2.2MΩ 69.8kΩ 2.2µF / 50V 21.5kΩ LED6 N.C. 40.2mA Fig.49 8series×3parallel, LED current 40.2mA setting, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/28 2011.06 - Rev.B Technical Note BD6150MUV 5inch panel Battery or adapter N.C. LED2 TEST LED3 FSEL LED6 ISET GND VBAT FAILFLAG SW BD6150MUV N.C. 16mA 27kΩ LED1 LED2 LED4 LED5 21.5kΩ Fig.50 8series×2parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application 10kΩ LED3 OCPSET 47kΩ VDET N.C. （like Enable） LED5 GND PWMPOW PWMDRV LED1 LED4 OCPSET PGND 10kΩ ISET FSEL 33kΩ 10kΩ PWM GND BD6150MUV TEST fPWM=100Hz~1kHz N.C. （like Enable） 1µF PGND LED ON/OFF PWMDRV N.C. 2.2µF SW VBAT SW PWMPOW VDET 8LED × 2parallel 2.2µF / 50V GND LED ON/OFF 10kΩ FAILFLAG 10kΩ PWM SW VREG fPWM=100Hz~1kHz 10kΩ 4.7µH 2.2MΩ 69.8kΩ 1µF PGND 2.2MΩ 69.8kΩ 2.2µF / 50V 2.2µF 10µF 8LED × 2parallel VREG 4.7µH PGND 10µF Battery or adapter LED6 N.C. 40.2mA Fig.51 8series×2parallel, LED current 40.2mA setting, Switching frequency 1250kHz setting example Power control PWM application Battery or adapter 10µF 4.7µH 8LED × 2parallel 2.2µF 1µF 10kΩ VBAT SW PWMPOW FAILFLAG 10kΩ PWM LED ON/OFF SW fPWM=100Hz~1kHz VREG PGND PWMDRV TEST BD6150MUV LED2 LED4 OCPSET ISET GND LED5 GND PGND LED1 LED3 FSEL 68kΩ 10kΩ N.C. （like Enable） N.C. VDET 2.2MΩ 69.8kΩ 2.2µF / 50V 14.7kΩ LED6 N.C. 88.8mA Fig.52 8series×2parallel, LED current 88.8mA setting, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/28 2011.06 - Rev.B Technical Note BD6150MUV Battery or adapter N.C. LED2 TEST LED3 FSEL N.C. 10kΩ VBAT FAILFLAG SW VBAT PWMDRV N.C. LED2 TEST LED3 FSEL BD6150MUV LED6 N.C. 177.6mA 10kΩ LED1 LED2 LED3 LED4 OCPSET 68kΩ VDET N.C. （like Enable） LED1 LED5 ISET ISET GND PWMPOW FAILFLAG 10kΩ PWM SW fPWM=100Hz~1kHz 14.7kΩ Fig.55 3series×6parallel, LED current 177.6mA setting, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1µF PGND LED5 GND SW 2.2µF LED4 14.7kΩ 10LED × 1parallel 2.2µF / 50V GND BD6150MUV 4.7µH SW VBAT FAILFLAG SW VREG SW N.C. OCPSET PGND 10kΩ LED ON/OFF FSEL 47kΩ 29.6mA 26.7kΩ VDET （like Enable） TEST N.C. 1MΩ 1µF PWMDRV N.C. 10µF 3LED × 6parallel 2.2MΩ 187kΩ LED ON/OFF PWMPOW LED6 Fig.54 3series×6parallel, LED current 29.6mA setting, Switching frequency 1250kHz setting example Power control PWM application VREG 4.7µH PGND 10kΩ LED5 Battery or adapter 2.2µF / 50V 10kΩ LED4 14.7kΩ Battery or adapter PWM LED2 LED3 16mA Fig.53 3series×5parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application fPWM=100Hz~1kHz BD6150MUV PGND ISET GND GND 47kΩ 27kΩ 2.2µF LED1 OCPSET LED6 10kΩ N.C. （like Enable） LED1 LED5 10µF VDET PWMDRV LED4 OCPSET PGND PWMPOW 10kΩ ISET FSEL 33kΩ 10kΩ PWM GND BD6150MUV TEST fPWM=100Hz~1kHz N.C. （like Enable） 1µF PGND LED ON/OFF PWMDRV N.C. 2.2µF GND VBAT SW PWMPOW VDET 3LED × 6parallel 2.2µF / 50V GND LED ON/OFF 10kΩ FAILFLAG 10kΩ PWM SW VREG fPWM=100Hz~1kHz 10kΩ 4.7µH 2.2MΩ 187kΩ 1µF PGND 2.2MΩ 187kΩ 2.2µF / 50V 2.2µF 10µF 3LED × 5parallel VREG 4.7µH PGND 10µF Battery or adapter LED6 N.C. 177.6mA Fig.56 10series×1parallel, LED current 177.6mA setting, Switching frequency 1250kHz setting example Power control PWM application 25/28 2011.06 - Rev.B Technical Note BD6150MUV ●Application example of Analog dimming Control LED current to charged D/A voltage. Show application example and typ control. Please decide final value after you evaluated application, characteristic. Battery or adapter 4.2V to 26V 10µF PWMPOW VBAT SW SW VREG 10kΩ FAILFLAG Power ON/OFF 1µF GND PWMDRV N.C. TEST BD6150MUV 432 470kΩ + 432 122kΩ DAC 0.6V LED1 LED2 LED4 ISET GND LED5 GND PGND GND typ LEDcurrent = LED3 OCPSET 68kΩ 10kΩ 432 DAC 122kΩ ISETvoltage N.C. FSEL 330pF VDET + 56kΩ Vin=2.1V to 5.5V 2.2µF / 50V 1µF PGND 10LED × 6parallel 432 470kΩ 2.2MΩ 1µF 4.7µH LEDcurrent = LED6 N.C. 20mA 470kΩ 22kΩ D/A Fig. 57 BD6150 Analog style optical application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 26/28 2011.06 - Rev.B Technical Note BD6150MUV ●Notes for use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected. The electrical characteristics are guaranteed under the conditions of each parameter. (3) Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply terminal. (4) Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the GND line, give consideration to design the patterns in a similar manner. Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. (6) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. (7) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. (8) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. (9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. (11) External capacitor In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc. (12) Thermal shutdown circuit (TSD) When junction temperatures become 175℃ (typ) or higher, the thermal shutdown circuit operates and turns a switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit operating or use the LSI assuming its operation. (13) Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual states of use. (14) Selection of coil Select the low DCR inductors to decrease power loss for DC/DC converter. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 27/28 2011.06 - Rev.B Technical Note BD6150MUV ●Ordering part number B D 6 Part No. BD 1 5 0 M Part No. 6150 U V Package MUV: VQFN024V4040 - E 2 Packaging and forming specification E2: Embossed tape and reel VQFN024V4040 <Tape and Reel information> 4.0±0.1 4.0±0.1 1.0MAX 2.4±0.1 0.4±0.1 7 12 19 18 0.5 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 6 24 0.75 E2 2.4±0.1 1 2500pcs (0.22) +0.03 0.02 -0.02 S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape 13 +0.05 0.25 -0.04 1pin Reel (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 28/28 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2011.06 - Rev.B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A