System Power Supply for TV Series FET Controller Type 3ch System Power Supply ICs No.09034EAT02 BD8606FV ●Description BD8606FV has realized the high performance and reliability required as a power supply for thin-screen TV. Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen TV which requires the high reliability. ●Features 1) 3ch synchronous rectification step-down system DC/DC converter controller 2) 3ch independent ON/OFF. controllable 3) Soft start, soft off function 4) Concentrated protection control with built-in sequencer 5) Built-in low voltage protection function 6) Built-in overvoltage protection function 7) Built-in overcurrent protection function 8) Built-in RT terminal open/short protection function 9) Frequency setting by external resistance is available. 10) Protection condition is output from PDET terminal. 11) Built-in external reset output function www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/22 2009.05 - Rev.A Technical Note BD8606FV ● Electric characteristic (Ta=25℃, VIN1, VIN2, VIN3=5.0V, VCC=5.0V, and GND=0V unless otherwise specified.) specification value UNIT Parameter Symbol MIN TYP MAX Circuit current 1 IQ1 2.5 5 mA Circuit current 2 IQ2 5.0 10 mA < Error amplifier part Ch1,Ch2,Ch3 > Standard voltage (VREF) VREF Condition CTL1,2,3=0V CTL1,2,3=VCC Terminal FB and FC terminal short VFB=0.9V VFB=0.7V VFB=0.9V VFB=0.9V, VFC=0.4V VFB=0.7V, VFC=1.6V 0.792 0.8 0.808 V Terminal FB Input bias current IFBB -1 Terminal FC Clamping voltage H VFCH 1.8 Terminal FC Clamping voltage L VFCL Terminal FC Sink current IFCSINK 0.5 Terminal FC Source current IFCSOURCE Open loop gain AVERR < OSC part > Oscillation frequency FOSC 100 < Soft start part Ch1,Ch2,Ch3 > Charging current ISS -4.0 Terminal SS Threshold voltage VSSTH 1.0 Terminal SS Clamping voltage VSSCLM 1.44 Terminal SS Standby voltage VSSSTB 0.11 Terminal SS Standby voltage 5 VSSSTB_HYS Maximum hysteresis error Terminal SS Discharge resistance RSS 49 Terminal SS Protection circuit start 1.0 VSSPON voltage Terminal SS Protection circuit start voltage VSSPON_HYS 10 Maximum hysteresis error < Low voltage, over voltage detection part Ch1,Ch2,Ch3 > Terminal FB Low voltage detection 0.27 VLVP voltage Terminal FB Low voltage detection VLVP_HYS 10 Maximum hysteresis error Terminal FB Overvoltage detection 1.08 VOVP voltage < Over current detection part Ch1,Ch2,Ch3 > Terminal LX input bias current ILXB -1 Terminal OCP input bias current IOCPB 20 < Reset detection part > Terminal MONVCC reset detection 0.98 VRSTO voltage Terminal MONVCC input bias -1 IMONVCCB current Terminal RSTDLY charging current IRSTDLY -15 Terminal RESET L output voltage VOL_RST < Others > Terminal PDET L output voltage VOL_RDET Terminal CTL input voltage H level 2.0 VIH_CTL voltage Terminal CTL input voltage L level VIL_CTL voltage Terminal CTL input current II_CTL - 0 100 1 0.2 -70 - μA V V mA μA dB - 600 kHz -2.5 1.1 1.72 0.15 -1.0 1.2 2.0 0.19 μA V V V 50 100 mV 70 91 kΩ 1.1 1.2 V 100 200 mV VSS voltage 0.32 0.37 V VFB voltage 100 200 mV VFB voltage 1.2 1.32 V VFB voltage 0 50 1 80 uA uA 1.0 1.02 V 0 1 uA -10 - -5 0.4 uA V IOL=100uA - 0.4 V IOL=100uA - VCC V - 0.5 V 40 70 uA VSS=1.0V VSS voltage, VFC=0.8V VSS voltage (L→H) VSS voltage (L→H) VMONVCC voltage (H→L) Terminal CTL1,2,3 Terminal CTL1,2,3 Terminal CTL1,2,3, CTL=VCC Terminal Terminal DRV H output voltage VOH_DRV 4.5 V DRV1A,2A,3A,1B,2B,3B Terminal Terminal DRV L output voltage VOL_DRV 0.5 V DRV1A,2A,3A,1B,2B,3B VFB : FB terminal voltage, VFC : FC terminal voltage, VSS : SS terminal voltage, VMONVCC : MONVCC terminal voltage Not designed for radiation resistance. Current capability should not exceed Pd. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/22 2009.05 - Rev.A Technical Note BD8606FV ● Block diagram 21 PGND3 22 DRV3B 23 LX3 24 DRV3A 25 VIN3 26 OCP3 27 FB3 12 28 FC3 29 SS3 30 RT 31 GND 32 TEST1 33 TEST2 34 CTL1 35 CTL2 36 CTL3 37 VCC 38 RESET RSTDLY 39 MONVCC PDET 40 VRSTO VREF Delay OVP1.5 LVP0.4 Driver Control SYSTEM CONTROL SEQUENCER SS1 SS2 SS3 Driver Control Driver Control VREF OVP1.5 LVP0.4 OVP1.5 LVP0.4 VREF OSC 20 PGND2 19 DRV2B 18 LX2 17 DRV2A 16 VIN2 15 OCP2 14 FB2 13 FC2 11 SS2 10 GND 9 SS1 8 FC1 7 FB1 6 OCP1 5 VIN1 4 DRV1A 3 LX1 2 DRV1B PGND1 1 Figure 1 Block char ● Terminal explanation Table 1 terminal explanation No. Symbol 1 PGND1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Description Ch1 power GND (same potential as GND terminal) DRV1B Ch1 Nch drive output terminal LX1 Ch1 overcurrent detection terminal DRV1A Ch1 Pch drive output terminal VIN1 Ch1 power supply input terminal Ch1 overcurrent detection level OCP1 resistance connection terminal FB1 Ch1 voltage detection terminal FC1 Ch1 phase compensation terminal Ch1 soft start adjustment capacity SS1 connection terminal GND GND (0V connection) Frequency adjustment resistance RT connection terminal Ch2 soft start adjustment capacity SS2 connection terminal FC2 Ch2 phase compensation terminal FB2 Ch2 voltage detection terminal Ch2 overcurrent detection level resistance OCP2 connection terminal VIN2 Ch2 power supply input terminal DRV2A Ch2 Pch drive output terminal LX2 Ch2 overcurrent detection terminal No. Symbol 21 PGND3 22 DRV3B Ch3 power GND (same potential as terminal GND) Ch3 Nch drive output terminal 23 LX3 Ch3 overcurrent detection terminal 24 25 DRV3A VIN3 26 OCP3 27 28 FB3 FC3 29 SS3 30 GND Ch3 Pch drive output terminal Ch3 power supply input terminal Ch3 overcurrent detection level resistance Ch3 voltage detection terminal Ch3 phase compensation terminal Ch3 soft start adjustment capacity connection terminal GND (0V connection) 31 TEST1 Test terminal (Connect to GND) 32 TEST2 Test terminal (connect to GND) 33 34 CTL1 CTL2 Ch1 control terminal Ch2 control terminal 35 CTL3 Ch3 control terminal 36 37 VCC RESET 38 19 Description Power supply input terminal Reset output terminal Reset delay adjustment capacity RSTDLY connection terminal MONVCC VCC monitor terminal DRV2B Ch2 Nch drive output terminal 39 Ch2 power GND 20 PGND2 40 PDET Off latch signal output (same potential as terminal GND) ※Please give to VCC+0.3V as an operation condition in all input terminals. However, please do not exceed the absolute maximum rating as VCC=VIN1=VIN2=VIN3. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/22 2009.05 - Rev.A Technical Note BD8606FV ● Terminal equivalent circuit chart Terminal Terminal No. name Explanation Terminal equivalent circuit chart 1 PGND1 Ch1 Power GND (GND Terminal and this potential) 20 PGND2 Ch2 Power GND (GND Terminal and this potential) 21 PGND3 Ch3 Power GND (GND Terminal and this potential) 2 DRV1B Ch1 Nch Driving output terminal 19 DRV2B Ch2 Nch Driving output terminal VIN VIN ② ⑲ 22 22 DRV3B Ch3 Nch Driving output terminal PGND PGND VIN 3 18 LX1 LX2 Ch1 Over current detection terminal Ch2 Over current detection terminal VIN VIN ③ ⑱ 23 23 LX3 Ch3 Over current detection terminal PGND VIN1 4 DRV1A Ch1 Pch Driving output terminal 17 DRV2A Ch2 Pch Driving output terminal VIN1 ④ ⑰ 24 24 DRV3A Ch3 Pch Driving output terminal PGND 5 VIN1 Ch1 Power supply input terminal 16 VIN2 Ch2 Power supply input terminal 25 VIN3 Ch3 Power supply input terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/22 PGND 2009.05 - Rev.A Technical Note BD8606FV Terminal No. 6 Terminal name Explanation OCP1 Ch1 Over current detection level Set resistance connection terminal Terminal equivalent circuit chart VCC VIN1 ⑥ ⑮ 15 OCP2 26 Ch2 Over current detection level Set resistance connection terminal GND Ch3 Over current detection level Set resistance connection terminal 26 OCP3 7 FB1 Ch1 Voltage detection terminal 14 FB2 Ch2 Voltage detection terminal VCC ⑦ ⑭ 27 27 FB3 Ch3 Voltage detection terminal GND VCC 8 FC1 Ch1 Phase amends terminal ⑧ ⑬ 28 13 FC2 Ch2 Phase amends terminal 28 FC3 Ch3 Phase amends terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/22 GND 2009.05 - Rev.A Technical Note BD8606FV Terminal No.. Terminal name 9 SS1 Ch1 Soft start Adjustment capacity connection terminal 12 SS2 Ch2 Soft start Adjustment capacity connection terminal 29 SS3 Ch3 Soft start Adjustment capacity connection terminal 10 GND GND (0V Connection) 30 GND GND (0V Connection) Explanation Terminal equivalent circuit chart VCC ⑨ ⑫ 29 GND VCC 11 RT Frequency adjustment resistance connection terminal ⑪ GND 31 TEST1 Test terminal VCC 32 TEST2 Test terminal 33 CTL1 Ch1 Control terminal 34 CTL2 Ch2 Control terminal 35 CTL3 Ch3 Control terminal 31 32 33 34 35 GND www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/22 2009.05 - Rev.A Technical Note BD8606FV Terminal No. Terminal name 36 VCC Explanation Terminal equivalent circuit chart Power supply input terminal VCC 37 RESET 37 Reset output terminal GND VCC 38 RSTDLY Reset Delay Adjustment capacity connection terminal 38 GND VCC 39 MONVCC 39 VCC Monitor terminal GND VCC 40 PDET 40 Off latch output terminal GND www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/22 2009.05 - Rev.A Technical Note BD8606FV ● Circuit chart PGND3 21 20 PGND2 DRV3B 19 22 DRV2B Driver Control Driver Control LX3 18 23 LX2 DRV3A 17 24 DRV2A VIN3 25 16 VIN2 OCP2 26 15 OCP3 VREF VREF FB2 27 14 FB3 FC3 28 13 FC2 OVP1.5 LVP0.4 29 SS2 12 OVP1.5 LVP0.4 SS3 GND TEST1 31 10 GND TEST2 FC1 36 VCC 7 6 OCP1 VIN1 DRV1A 4 37 RESET VREF 5 35 CTL3 FB1 SS1 SS2 SS3 SYSTEM CONTROL SEQUENCER 8 33 34 CTL2 RSTDLY 3 DRV1B 2 Driver Control PWM Counter PGND1 1 40 VRSTO PWM Counter LX1 Delay 38 MONVCC 39 9 32 SS1 OVP1.5 LVP0.4 CTL1 PDET 11 30 OSC RT ※ ※ It measures it by the static test mode. The circuit chart of CH2 and CH3 is omitted. Figure 2 Circuit chart www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/22 2009.05 - Rev.A Technical Note BD8606FV ● Application circuit chart VCC 40uF VIN 20 21 PGND3 PGND2 22μF×2 DRV3B DRV2B 18 LX3 LX2 24 17 4.7μH Driver Control 23 10μF 19 22 VO 3 : 3.3V Driver Control DRV3A 15 VREF VREF OCP3 OCP2 27 14 1000pF FB3 FB2 13 28 180KΩ FC3 FC2 12 29 6800pF OVP1.5 LVP0.4 OVP1.5 LVP0.4 SS3 SS2 GND RT 31 10 TEST1 6800pF 24KΩ5600pF 66KΩ SS1 SS2 SS3 FB1 4.7KΩ 33KΩ 180pF 0Ω OCP1 36 VIN 5 SYSTEM CONTROL SEQUENCER VREF VIN1 4 37 Driver Control 10μF 4.7μH VO 1 : 1.2V LX1 2 39 22μF×2 DRV1B 1 40 VRSTO 3 38 Delay DRV1A RSTDLY 100KΩ SS1 FC1 RESET MONVCC 27KΩ 6 35 External PullUp VCC 100KΩ 100KΩ 33KΩ 110KΩ1000pF 6800pF 7 34 CTL3 0.1μF 72KΩ 8 33 CTL2 9 32 OVP1.5 LVP0.4 CTL1 0Ω 0Ω 47pF 4.7KΩ 153 KΩ GND TEST2 0Ω 0Ω 11 30 OSC 56KΩ VO 2 : 2.5V VIN2 26 0Ω 39pF 175KΩ 4.7μH 16 VIN3 4.7KΩ 22μF×2 DRV2A 25 VIN 10μF TEST3 PGND1 Figure 3 Application circuit chart www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/22 2009.05 - Rev.A Technical Note BD8606FV ●Each characteristic reference data 600 550 500 450 SWITCHING FREQUENCY : fosc[kHz] ERROR AMP REFERENCE VOLTAGE : VREF[V] 0.900 0.875 0.850 0.825 0.800 0.775 0.750 0.725 400 350 300 250 200 150 100 0.700 -40 -30 -20 -10 0 10 20 30 40 50 60 70 RT=27kΩ -40 -30 -20 -10 80 Figure 4 Standard voltage-temperature characteristic 135 60 GAIN [dB] 40 20 45 0 0 Gain -45 -40 Ph ase [de g] 90 -90 -60 -80 -135 -100 -180 1000 10000 100000 20 30 40 50 60 70 80 4.0 SS CHARGE CURRENT : Iss[μA] Phase -20 10 Figure 5 Switching frequency-temperature characteristic 180 100 80 0 AMBIENT TEMPERATURE : Ta[℃] AMBIENT TEMPERATURE : Ta[℃] 1000000 3.5 3.0 2.5 2.0 1.5 1.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE : Ta[℃] 10000000 f [H z] Figure 7 Terminal SS charge current-temperature characteristic Figure 6 Open loop characteristic 15 RSTDLY CHARGE CURRENT : Irstdly[μA] OCP INPUT CURRENT : Iocp[μA] 80 70 60 50 40 30 20 -40 -30 -20 -10 0 10 20 30 40 50 60 70 14 13 12 11 10 9 8 7 6 5 -40 -30 -20 -10 80 AMBIENT TEMPERATURE : Ta[℃] 10 20 30 40 50 60 70 80 Figure 9 Terminal RSTDLY charge current-temperature characteristic Figure 8 Terminal OCP inflow current-temperature characteristic 1.10 PWM FREQUENCY [kHz] 1000 1.05 Vrsto[V] 0 AMBIENT TEMPERATURE : Ta[℃] 1.00 0.95 0.90 -40 -30 -20 -10 0 10 20 30 40 50 60 70 100 10 80 10 AMBIENT TEMPERATURE : Ta[℃] Figure 10 MONVCC reset detection voltage-temperature characteristic 100 90 POWER EFFICIENCY[%] 3.4ms 1.72V SS 3.3V 80 70 60 50 VIN=5.0V Vo=3.3V External FET：SP8M4 Drive 40 30 20 10 Vo 1000 Figure 11 Switching frequency-terminal RT resistance characteristic 5V CTL 100 RT RESISTANCE [kΩ] Css=6800pF 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT[A] Figure 12 Soft start crimp www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Figure 13 Efficiency 10/22 2009.05 - Rev.A Technical Note BD8606FV Reference data of dead time 90% DRVA (Pch Gate) 10% 90% DRVB (Nch Gate) 10% Trdeat Tfdeat Figure 14 Dead time (VCC=5.0V,VIN=5.0V,Ta=25℃) Parameter PchMOS OFF→NchMOS ON Dead time NchMOS OFF→PchMOS ON Dead time Symbol Trdeat Tfdeat 200 min 90 100 typ 120 140 max 160 190 UNIT ns ns 200 VCC=4.0V VCC=4.0V VCC=5.0V Tfdeat [nsec] 150 Trdeat [nsec] 150 VCC=5.0V VCC=7.0V 100 VCC=7.0V 100 50 50 -40 -20 0 20 40 60 80 -40 AMBIENT TEMPERATURE : Ta[℃] -20 0 20 40 60 80 AMBIENT TEMPERATURE : Ta[℃] Figure 15 Dead time Trdeat - Temperature characteristic (pcs) 7 Figure 16 Dead time Tfdeat - Temperature characteristic (pcs) 7 VCC=VIN=5.0V Ta=25℃ n=12(2lot) 6 6 5 5 5 4 4 VCC=VIN=5.0V Ta=25℃ n=12(2lot) 6 6 4 3 3 2 2 2 1 190 188 185 183 180 178 175 173 170 168 165 163 160 158 155 153 150 148 145 143 140 138 135 133 130 128 125 123 120 118 115 113 110 108 105 103 100 160 158 155 153 150 148 145 143 140 138 135 133 130 128 125 123 120 118 115 113 110 108 0 105 103 100 0 98 95 93 1 90 1 Trdeat[ns] Tfdeat[ns] Figure 17 Dead time Trdeat - Difference www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Figure 18 Dead time Tfdeat - Difference 11/22 2009.05 - Rev.A Technical Note BD8606FV Reset detection data VCC 100kΩ RESET MONVCC 1.235V (typ) 1.0V (typ) RSTDLY Figure 19 Circuit chart RESET[V] VRST_HYS VOL_RST MONVCC[V] VRSTO Figure 20 Reset detection (VCC=5V,Ta=25℃) Parameter Terminal MONVCC reset detection voltage Terminal MONVCC reset detection voltage Maximum hysteresis error www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Symbol VRSTO min 0.98 typ 1.0 max 1.02 UNIT V VRST_HYS 20 72 180 mV 12/22 2009.05 - Rev.A Technical Note BD8606FV Permissible loss T cmax θ jc [ ℃ /W] 28.0 θ ja [ ℃ /W] 111.1 T STGmin T STGmax T a min T a max [℃ ] [℃ ] [℃ ] [℃ ] -50.0 150.0 -45.0 T j max Destruction Destruction temperature temperature 85.0 [℃ ] [℃ ] 150.0 150.0 1.2 Permissible loss ： Pd [W] 1 ROHM standard substrate mounting θja=111.1℃/W 0.8 0.6 0.4 0.2 0 0 25 50 75 100 125 150 Ambient temperature ： Ta [℃] ROHM standard substrate specification Material The glass epoxy Size 70mm×70mm×1.6mmt Figure 21Heat decrease curve ※These values are the example values, and no guarantee values. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/22 2009.05 - Rev.A Technical Note BD8606FV ● Operation description ON/OFF control DC/DC converter controller ON/OFF function DC/DC converter controller of each Ch can be independently controlled ON/OFF by CTL1, CTL2, and CTL3 terminal. Analog circuit of Ch interlocked to each CTL terminal starts operation at ON control (on mode), and goes down to setting output voltage. Analog circuit of Ch interlocked to each CTL terminal should be standby at OFF control (off mode), and output voltage becomes 0V. Table 2 DC/DC converter controller ON/OFF function CTL1 terminal voltage Ch1 CTL2 terminal voltage Ch2 CTL3 terminal voltage Ch3 >VIHCTL1 ON control >VIHCTL2 ON control >VIHCTL3 ON control <VILCTL1 OFF control <VILCTL2 OFF control <VILCTL3 OFF control Soft start time set function DC/DC converter controller of each Ch can do soft start without overshoot by charging soft start capacity (Css) connected between ss terminal and GND in each Ch by charging current at ON control. The mute of the output is released when it reaches VSS=0.15V (VSSSTB), and the output voltage does the soft start operation from the point of VSS=0.3V (typ) in proportion to the voltage of the terminal SS. Also, soft start time (tss) can be set by setting soft start capacity arbitrarily. Soft start time (tss) should be set at 3msec < tss < 30msec. ※Please note that the overshoot is not caused in the output setting voltage when setting it to tss≦3msec. t SS 400us＋ 1.1V CSS 2.5uA Discharge function DC/DC converter controller of each Ch can do soft off by discharging load discharged to soft start capacity connected between SS terminal to GND by discharging resistance at OFF control. Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ). 2.0V CTL terminal voltage 0.5V 1.9V 1.1V 0.8V SS terminal voltage 0.15V 0.3V Output voltage Mute release tss Figure 22 Wave form at ON/OFF control www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 14/22 2009.05 - Rev.A Technical Note BD8606FV OSC oscillation frequency setting function DRVA and DRVB output oscillation frequency of DC/DC converter controller of each Ch can be set by installing resistance between RT terminal and GND externally. Switching frequency[KHz] 10000 1000 100 10 1 10 RT terminal resistance[KΩ] 100 *reference data 1000 Figure 23 Terminal RT resistance-oscillation frequency Off latch signal output function PDET terminal outputs condition of off latch when protection operation of DC/DC converter controller of each Ch operates. Table 3 PDET terminal off latch signal output function Protection operation Terminal PDET ON LOW OFF Hi-Z www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 15/22 2009.05 - Rev.A Technical Note BD8606FV Reset output function Reset output function observes voltage value from MONVCC terminal and does reset operation compared to internal reference level. Set MONVCC terminal external resistance to make VCC voltage more than 5.0V at reset release. Table 4 DC/DC converter controller ON/OFF function MONVCC terminal voltage RESET terminal ＜1.0V(typ) LOW ＞1.072V(typ) Hi-Z Delay time until detecting reset release is settable by capacitor connected to RSTDLY terminal. TRSTDLY 1.235V CRSTDLY IRSTDLY VCC α(VRSTO+VRSTO_HYS) (α= R1+R2 R2 ) R1 MONVCC α・VRSTO VCC R2 VRSTO (1.0V) Power supply in reset input side 0 RESET IRSTDLY Hi Z RESET Low TRSTDLY 1.235V CRSTDLY Figure 24 Reset operation ( TRSTDLY：Delay time until detecting reset release ) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 16/22 2009.05 - Rev.A Technical Note BD8606FV Output Duty Output Duty of DRVA of the DC/DC converter controller of each Ch is decided depending on the voltage of the terminal FC of each Ch. Setting output Duty Output setting voltage 100 [%] VIN voltage 9% Setting output Duty 92% 100 Quality item characteristic （typ) About 92% Duty [%] Output Duty setting range When FC=1.2V Output Duty=50%±15% 50 About 9% 0.0 0.5 0.9 1.5 1.2 2.0 FC terminal Voltage [V] Figure 25 FC Voltage-Output Duty Linearity www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 17/22 2009.05 - Rev.A Technical Note BD8606FV ● Protection function Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operation. Low voltage protection function(LVP) Low voltage protection function detects output voltage VO set in each Ch from FB terminal of each Ch and off-latched all DC/DC converter controller compared to internal reference level. Low voltage protection function operates when FB terminal voltage falls below VLVP (=1.5 × VREF) and continues about more than 400μsec (typ). CTL terminal >VIHCTL <VILCTL Table 5 Low voltage protection function Low voltage protection FB terminal function <VLVP Enable >VLVP+VLVP_HYS Disable Disable SS terminal >1.1V(typ) <1.0V(typ) - Low voltage protection operation ON OFF OFF OFF ※Constant voltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start). Overvoltage protection function(OVP) Overvoltage protection function detects output voltage VO set in each Ch from FB terminal of each Ch and off-latched all DC/DC converter controller compared to internal reference level. Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.5 × VREF) and continues about more than 400μsec (typ). Table 6 Overvoltage protection function Overvoltage protection Overvoltage protection SS terminal FB terminal function operation >VOVP ON >1.1V(typ) Effective >VIHCTL <VOVP OFF <1.0V(typ) Invalidity OFF <VILCTL Invalidity OFF ※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start). CTL terminal VFB 1.5×VREF FB terminal Voltage 0.4×VREF+VLVP_HYS VREF 0.4×VREF 0 ON Protection OFF LVP PDET terminal OVP LVP Hi-Z LOW Figure 26 Low voltage and over voltage protection www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 18/22 2009.05 - Rev.A Technical Note BD8606FV Overcurrent protection function(OCP) Overcurrent protection function compared drain voltage (LX terminal voltage) with OCP terminal voltage when external Pch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS would be OFF. Up to 50uA (typ) of constant current from OCP terminal is synchronized. Overcurrent detection level (OCP terminal voltage) can be set arbitrarily by external resistance value. Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and continues about more than 400μsec (typ). Table 7 overcurrent protection function Overcurrent SS terminal LX terminal voltage protection function <VOCP >1.1V(typ) Enable >VIHCTL >VOCP <1.0V(typ) Disable <VILCTL Disable ※Set OCP terminal voltage to be more than VIN-2.5V (typ). CTL terminal Overcurrent protection operation ON OFF OFF OFF LX terminal Voltage OCP terminal Voltage Immediately off Immediately off Immediately off DRVA DRVB Output current Output current Rocp LX Protection ON OFF 400usec (typ) to an off latch in continuance 400usec OCP Immediately off operation Off latch Figure 27 Overcurrent protection www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 19/22 2009.05 - Rev.A Technical Note BD8606FV Terminal FC abnormality protection function FC FB ErrAmp FCP To SEQ DRVA PWMCOMP D R V SS DRVB Internal triangular wave FCHP=1.95V(typ) 1.5V(typ) Internal triangular wave FC 0.9V(typ) FCLP=0.62V(typ) About 400usec(typ) continuance and an off latch. About 400usec(typ) Off latch The terminal FC abnormality protection function Ofrattis it all DC/DC converter controller detecting the continuance of the state that FC which is the difference input of PWMCOMP does not intersect with an internal triangular wave. The terminal FC abnormality protection function is exceeded 1.95V(typ) by the voltage of the terminal FC or operates when it falls below 0.62V(typ), and about 400usec(typ) or more continues. CTL terminal SS terminal Protection operation FC terminal Terminal FC abnormality protection operation ON > 1.95V(typ) 0.62V(typ) < , < > VIHCTL OFF 1.95V(typ) < 1.0V(typ) < 0.62V(typ) ON Disable < VIHCTL OFF ※Terminal FC abnormality protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start). > 1.1V(typ) Enable RT terminal open/short protection function RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short condition internally from RT terminal to prevent from output voltage error caused by abnormal oscillation of internal triangular wave at RT terminal open/short. RT terminal open/short protection function is regularly enabled after boot-up. RT terminal open/short protection function operates when error detection condition continues about more than 400μsec (typ). www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 20/22 2009.05 - Rev.A Technical Note BD8606FV Soft start time-out function Each Ch DC/DC converter controller off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS after 50msec (typ) passed from soft start. VSSCLM VSSPON SS terminal VSSSTB+VSSSTB_HYS 0V about 50msec( typ) Figure 28 At soft start time-out Error detection (off latch) release method Each Ch DC/DC converter controller comes into off latch condition when protection function operates. Off latch can be released by the following method. Each Ch DC/DC converter controller becomes able to do ON control transition by releasing off latch. 1. Set all Ch CTL terminal voltage as < VILCTL and continue that condition about more than 200usec (typ). 2. Drop down power supply VCC to below 3.7V. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 21/22 2009.05 - Rev.A Technical Note BD8606FV ●Ordering part number B D 8 Part No. 6 0 6 F Part No. V - E Package FV: SSOP-B40 2 Packaging and forming specification E2: Embossed tape and reel SSOP-B40 <Dimension> <Tape and Reel information> 13.6 ± 0.2 21 1 20 Direction of feed E2 0.3Min. 2000pcs 0.15 ± 0.1 1234 1234 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1pin 1234 (Unit:mm) Reel 1234 0.08 M 1234 0.22 ± 0.1 1234 0.1 0.65 (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) 1234 0.1 Embossed carrier tape Quantity 1234 1.8 ± 0.1 7.8 ± 0.3 5.4 ± 0.2 40 Tape Direction of feed ※When you order , please order in times the amount of package quantity. 22/22 2009.05 - Rev.A 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, fuel-controller 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 © 2009 ROHM Co., Ltd. All rights reserved. R0039A