A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q 60V 550mA LED DRIVER and AUTOMOTIVE GRADE Description Pin Assignments The ZXLD1356 is a continuous mode inductive step-down converter, (TOP VIEW) designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates 5 VIN LX 1 from an input supply between 6V and 60V and provides an externally GND 2 adjustable output current of up to 550mA. Depending upon supply voltage and external components, this can provide up to 30 watts of 4 ISENSE ADJ 3 output power. TSOT25 The ZXLD1356 has been qualified to AECQ100 Grade 1 enabling operation in ambient temperatures from -40°C to +125°C (TOP VIEW) Output current can be adjusted above, or below the set value, by LX 1 applying an external control signal to the 'ADJ' pin. Enhanced output 6 VIN current dimming can be achieved by applying a PWM signal to the ‘ADJ’ pin. GND 2 5 GND ADJ 3 4 ISENSE Features V-DFN3030-6 • Typically better than 0.8% output current accuracy • Simple and with low part count • Single pin on/off and brightness control using DC voltage or PWM Applications • PWM resolution up to 1000:1 • • High efficiency (up to 97%) • • Automotive Lighting Wide input voltage range: 6V to 60V • • Low Voltage Industrial Lighting Inherent open-circuit LED protection • • LED Back-Up Lighting Available in thermally enhanced packages 44°C/W V-DFN3030-6 θJA • Illuminated Signs • Emergency Lighting • SELV Lighting • Refrigeration Lights • TSOT25 θJA 82°C/W Available in “Green” Molding Compound (No Br, Sb) with lead Free Low Voltage Halogen Replacement LEDs Finish/ RoHS Compliant • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) ZXLD1356QET5TA Automotive Grade qualified to AEC-Q100 Grade 1 Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen and Antimony free, "Green" and Lead-Free. 3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 1 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Applications Circuit D1 Rs VIN (24V) 0.36V L1 C1 4.7µF 100nF VIN I SENSE ADJ ZXLD1356 LX GND GND Pin Descriptions Pin Name LX GND Pin Number TSOT25 V-DFN3030-6 1 1 2 2, 5 ADJ 3 3 ISENSE 4 4 VIN 5 6 Pad — Pad ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 Function Drain of NDMOS switch Ground (0V) Multi-function On/Off and brightness control pin: • Leave floating for normal operation.(VADJ = VREF = 1.25V giving nominal average output current o IOUTnom = 0.2V/RS) • Drive to voltage below 0.2V to turn off output current • Drive with DC voltage (0.3V<VADJ<2.5V) to adjust output current from 24% to 200% of IOUTnom • Connect a capacitor from this pin to ground to define soft-start time. Soft-start time is approx.0.2ms/nF Connect resistor RS from this to VIN to define nominal average output current IOUTnom = 0.2/RS (Note: RSMIN=0.36V with ADJ pin open circuit) Input voltage (6V to 60V). Decouple to ground with 4.7µF of higher X7R ceramic capacitor close to device Exposed pad (EP) - connected to device substrate. To improve thermal impedance of package the EP must be connected to power ground but should not be used as the 0V (GND) current path. It can be left floating but must not be connected to any other voltage other than 0V. 2 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Functional Block Diagram D1 VIN L1 RS 5 5V C1 4.7μF 4 VIN 1 ISENSE LX R1 Voltage regulator + 0.2V + Low voltage detector MN + Adj 3 R4 50K R5 20K 600KHz R2 D1 1.25V + R3 1.35V Gnd 2 Figure 1. Block Diagram – Pin Connections Shown for TSOT25 Package Absolute Maximum Ratings (Voltages to GND, unless otherwise specified.) Symbol VIN VSENSE VLX VADJ ILX PTOT Parameter Input Voltage ISENSE Voltage LX Output Voltage Adjust Pin Input Voltage Switch Output Current Power Dissipation (Refer to package thermal de-rating curve on page 25) TSOT25 V-DFN3030-6 Rating -0.3 to +60 (65V for 0.5 sec) +0.3 to -5.0 (measured with respect to VIN) -0.3 to +60 (65V for 0.5 sec) Unit -0.3 to +6.0 V 0.65 A 1 1.8 W V V V TST Storage Temperature -55 to +150 °C TJ MAX Junction Temperature 150 °C These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability. ESD Susceptibility Human Body Model Charged Device Model Machine Model Rating 500 >1000 <100 Unit V V V Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor pin. The machine model is a 200pF capacitor discharged directly into each pin. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Thermal Resistance Symbol Parameter TSOT25 Rating V-DFN3030-6 44 Unit θJA Junction to Ambient 82 ΨJB Junction to Board 33 — °C/W θJC Junction to Case — 14 °C/W Min Max Units 6 60 V Minimum switch off-time 800 ns tONMIN Minimum switch on-time 800 ns fLX max Recommended maximum operating frequency (Note 5) 625 kHz °C/W Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol tOFFMIN DLX TOP Notes: Parameter Input voltage (Note 4) VIN Duty cycle range 0.01 0.99 Operating temperature range -40 +125 °C 4. VIN > 16V to fully enhance output transistor. Otherwise out current must be derated - see graphs. Operation at low supply may cause excessive heating due to increased on-resistance. Tested at 7V guaranteed for 6V by design. 5. ZXLD1356 will operate at higher frequencies but accuracy will be affected due to propagation delays. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 4 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Electrical Characteristics (VIN = 24V, @TAMB = +25°C, unless otherwise specified.) Symbol Parameter VSU Internal regulator start-up threshold VSD Internal regulator shutdown threshold Condition Min 4.40 Typ Max 4.85 5.2 4.75 IINQoff Quiescent supply current with output off ADJ pin grounded 65 IINQon Quiescent supply current with output switching (Note 6) ADJ pin floating, L = 68mH, 3 LEDsf = 360kHz 1.6 Mean current sense threshold voltage (Defines LED current setting accuracy) Measured on ISENSE pin with respect to VIN VADJ = 1.25V; VIN = 18V VSENSE VSENSEHYS ISENSE Sense threshold hysteresis ΔVREF/ΔT VADJ VADJoff VADJon RADJ ISENSE pin input current Temperature coefficient of VREF External control voltage range on ADJ pin for DC brightness control (Note 7) DC voltage on ADJ pin to switch device from active (on) state to quiescent (off) state DC voltage on ADJ pin to switch device from quiescent (off) state to active (on) state LX switch ‘On’ resistance ILX(leak) LX switch leakage current DCADJ (*) fLXmax Notes: mV % 10 µA 50 ppm/°C 2.5 V 0.20 0.27 V VADJ rising 0.2 0.25 0.3 V 0< VADJ < VREF, VADJ > VREF +100mV 30 10.4 50 14.2 65 18.0 kΩ 0.5 @ ILX = 0.55A Note 8 Operating frequency (See graphs for more details) 205 0.15 DC Brightness control range fLX mA VADJ falling PWM frequency <300Hz PWM amplitude = VREF Measured on ADJ pin Start up time (See graphs for more details) µA V 0.3 Duty cycle range of PWM signal applied to ADJ pin during low frequency PWM dimming mode Brightness control range tSS 108 1.25 Continuous LX switch current RLX DPWM(LF) 4 VSENSE = VIN -0.2 Measured on ADJ pin with pin floating Resistance between ADJ pin and VREF ILXmean 200 V V ±15 Internal reference voltage VREF 195 Unit Time taken for output current to reach 90% of final value after voltage on ADJ pin has risen above 0.3V. Requires external capacitor 22nF. ADJ pin floating L= 68mH (0.36V) IOUT = 0.55A @ VLED = 3.6V Driving 3 LEDs Recommended maximum operating frequency 0.001 0.55 A 0.75 Ω 5 µA 1 1000:1 5:1 2 ms 360 kHz 500 kHz 6. Static current of device is approximately 700 µA, see Graph, Page 17. 7. 100% brightness corresponds to VADJ = VADJ(nom) = VREF. Driving the ADJ pin above VREF will increase the VSENSE. threshold and output current proportionally. 8. Ratio of maximum brightness to minimum brightness before shutdown VREF =1.25/0.25. VREF externally driven to 2.5V, ratio 10.1. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 5 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Device Description The device, in conjunction with the coil (L1) and current sense resistor (RS), forms a self-oscillating continuous-mode buck converter. Device operation (refer to Figure 1 - Block diagram and Figure 2 operating waveforms) VIN LX voltage 0V Toff Ton VIN 230mV 170mV SENSE voltage 200mV VSENSEVSENSE+ IOUTnom +15% IOUTnom Coil current IOUTnom -15% 0V Comparator input voltage 0.15VADJ VADJ 0.15VADJ Comparator output 5V 0V Figure 2. Theoretical Operating Waveforms Operation can be best understood by assuming that the ADJ pin of the device is unconnected and the voltage on this pin (VADJ) appears directly at the (+) input of the comparator. When input voltage VIN is first applied, the initial current in L1 and RS is zero and there is no output from the current sense circuit. Under this condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches the LX pin low, causing current to flow from VIN to ground, via RS, L1 and the LED(s). The current rises at a rate determined by VIN and L1 to produce a voltage ramp (VSENSE) across RS. The supply referred voltage VSENSE is forced across internal resistor R1 by the current sense circuit and produces a proportional current in internal resistors R2 and R3. This produces a ground referred rising voltage at the (-) input of the comparator. When this reaches the threshold voltage (VADJ), the comparator output switches low and MN turns off. The comparator output also drives another NMOS switch, which bypasses internal resistor R3 to provide a controlled amount of hysteresis. The hysteresis is set by R3 to be nominally 15% of VADJ. When MN is off, the current in L1 continues to flow via D1 and the LED(s) back to VIN. The current decays at a rate determined by the LED(s) and diode forward voltages to produce a falling voltage at the input of the comparator. When this voltage returns to VADJ, the comparator output switches high again. This cycle of events repeats, with the comparator input ramping between limits of VADJ ± 15%. Switching Thresholds With VADJ = VREF, the ratios of R1, R2 and R3 define an average VSENSE switching threshold of 200mV (measured on the ISENSE pin with respect to VIN). The average output current IOUTnom is then defined by this voltage and RS according to: IOUTnom = 200mV/RS Nominal ripple current is ±30mV/RS ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 6 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Device Description (cont.) Adjusting Output Current The device contains a low pass filter between the ADJ pin and the threshold comparator and an internal current limiting resistor (50kΩ nom) between ADJ and the internal reference voltage. This allows the ADJ pin to be overdriven with either DC or pulse signals to change the VSENSE switching threshold and adjust the output current. Details of the different modes of adjusting output current are given in the applications section. Output Shutdown The output of the low pass filter drives the shutdown circuit. When the input voltage to this circuit falls below the threshold (0.2V nom.), the internal regulator and the output switch are turned off. The voltage reference remains powered during shutdown to provide the bias current for the shutdown circuit. Quiescent supply current during shutdown is nominally 60µA and switch leakage is below 5µA. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 7 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Actual Operating Waveforms [VIN = 15V, RS = 0.36V, L = 68µH] Normal operation. Output current (Ch3) and LX voltage (Ch2) Actual Operating Waveforms [VIN = 30V, RS = 0.36V, L = 68µH] Normal operation. Output current (Ch3) and LX voltage (Ch2) Actual Operating Waveforms [VIN = 60V, RS = 0.36V, L = 68µH] Normal operation. Output current (Ch3) and LX voltage (Ch2) ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 8 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions ZXLD1356 Output Current L = 68µH 0.640 0.620 Output Current (A) 0.600 0.580 0.560 0.540 0.520 0.500 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs ZXLD 1356 Output Current Deviation (Normalized) L = 68µH 10% 8% Output Current Deviation (%) 6% 4% 2% 0% -2% -4% -6% -8% -10% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LED s ZXLD1356 Efficiency L = 68µH 100% 95% 90% Efficiency (%) 85% 80% 75% 70% 65% 60% 55% 50% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 9 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Switching Frequency L = 68µH 700 Switching Frequency (kHz) 600 500 400 300 200 100 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs ZXLD1356 Duty Cycle L = 68µH 100 90 80 Duty Cycle (% ) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 10 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Output Current L = 100µH 0.640 0.620 Output Current (A) 0.600 0.580 0.560 0.540 0.520 0.500 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LED s 15 LED s ZXLD1356 Output Current Deviation (N ormalized) L = 100µH 10% Output Current Deviation (%) 8% 6% 4% 2% 0% -2% -4% -6% -8% -10% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LED s 15 LED s ZXLD1356 Efficiency L = 100µH 100% 95% 90% Efficiency (%) 85% 80% 75% 70% 65% 60% 55% 50% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Switching Frequency L = 100µH 700 Switching Frequency (kHz) 600 500 400 300 200 100 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs ZXLD1356 Duty Cycle L = 100µH 100 90 80 Duty Cycle (%) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 12 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Output C urrent L = 150µH 0.640 0.620 Output Current (A) 0.600 0.580 0.560 0.540 0.520 0.500 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LED s 15 LED s ZXLD1356 Output Current Deviation (Normalized) L = 150µH 10% 8% Output Current Deviation (%) 6% 4% 2% 0% -2% -4% -6% -8% -10% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs ZXLD1356 Efficiency L = 150µH 100% 95% 90% Efficiency (%) 85% 80% 75% 70% 65% 60% 55% 50% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 13 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Switching Frequency L = 150µH 700 Switching Frequency (kHz) 600 500 400 300 200 100 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LED s 15 LED s ZXLD1356 Duty Cycle L = 150µH 100 90 80 Duty Cycle (%) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 5 LEDs 7 LEDs 9 LEDs 14 of 29 www.diodes.com 11 LEDs 13 LEDs 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Output Current L = 220µH 0.640 0.620 Output Current (A) 0.600 0.580 0.560 0.540 0.520 0.500 0 10 20 30 40 60 50 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs ZXLD 1356 Output Current Deviation (Normalized) L = 220µH 10% Output Current Deviation (%) 8% 6% 4% 2% 0% -2% -4% -6% -8% -10% 0 10 20 30 40 50 60 Supply Voltage (V) 1 LED 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LED s 15 LEDs ZXLD1356 Efficiency L = 220µH 100% 95% 90% Efficiency (%) 85% 80% 75% 70% 65% 60% 55% 50% 0 10 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 20 5 LEDs 30 Supply Voltage (V) 7 LEDs 9 LEDs 15 of 29 www.diodes.com 40 11 LEDs 50 13 LEDs 60 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) ZXLD1356 Switching Frequency L = 220µH 700 Switching Frequency (kHz) 600 500 400 300 200 100 0 0 10 1 LED 3 LEDs 20 5 LEDs 30 Supply Voltage (V) 7 LEDs 40 9 LEDs 11 LEDs 50 13 LEDs 60 15 LEDs ZXLD1356 Duty Cycle L = 220µH 100 90 80 Duty Cycle (%) 70 60 50 40 30 20 10 0 0 10 1 LED ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 3 LEDs 20 5 LEDs 30 Supply Voltage (V) 7 LEDs 9 LEDs 16 of 29 www.diodes.com 40 11 LEDs 50 13 LED s 60 15 LEDs October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) LED Current vs Vadj 600 500 LED Current (mA) 400 300 200 100 0 0 1 2 3 ADJ Pin Voltage (V) R=0.36Ω R=0.56Ω R=1.33Ω Supply current 800 Supply current (mA) 700 600 500 400 Output transistor fully enhanced 300 Output transistor not fully enhanced 200 100 0 0 10 20 30 40 50 60 70 Supply voltage (V) Vref ADJ pin voltage (V) 1.243 1.2425 1.242 1.2415 1.241 1.2405 1.24 1.2395 1.239 1.2385 1.238 0 10 20 30 40 50 60 70 Supply voltage (V) Shutdown current Shutdown current (mA) 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 Supply voltage (V) ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 17 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Typical Operating Conditions (cont.) Lx on-resistance vs supply voltage 2.5 O n -resistan ce (O h m s) 2 1.5 -40 oC 25 oC 125 oC 1 0.5 0 0 10 20 30 40 50 60 70 S u p p ly V o ltag e (V ) Vadj vs Temperature 1.262 1.26 1.258 Vadj (V) 1.256 7V 9V 12V 20V 30V 1.254 1.252 1.25 1.248 1.246 1.244 -50 0 50 100 Temperature (C) 150 200 Lx on-resistance vs die temperature 1.6 On-resistance (Ohms) 1.4 1.2 1 7V 9V 12V 20V 30V 0.8 0.6 0.4 0.2 0 -50 ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 0 50 100 Die Temperature (C) 18 of 29 www.diodes.com 150 200 October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information Setting Nominal Average Output Current with External Resistor RS The nominal average output current in the LED(s) is determined by the value of the external current sense resistor (RS) connected between VIN and ISENSE and is given by: IOUTnom = 0.2/RS [for RS > 0.36Ω] The table below gives values of nominal average output current for several preferred values of current setting resistor (RS) in the typical application circuit shown on page 1: RS(Ω) 0.36 0.56 1.33 Nominal Average Output Current (mA) 555 357 150 The above values assume that the ADJ pin is floating and at a nominal voltage of VREF (= 1.25V). Note that RS = 0.36V is the minimum allowed value of sense resistor under these conditions to maintain switch current below the specified maximum value. It is possible to use different values of RS if the ADJ pin is driven from an external voltage. (See next section). Output Current Adjustment by External DC Control Voltage The ADJ pin can be driven by an external dc voltage (VADJ), as shown, to adjust the output current to a value above or below the nominal average value defined by RS. ZXLD1356 ADJ + GND DC GND The nominal average output current in this case is given by: IOUTdc = (VADJ /1.25) x (0.2/RS) [for 0.3< VADJ <2.5V] Note that 100% brightness setting corresponds to VADJ = VREF. When driving the ADJ pin above 1.25V, RS must be increased in proportion to prevent IOUTdc exceeding 550mA maximum. The input impedance of the ADJ pin is 50kΩ ±25% for voltages below VREF and 14.2kΩ ±25% for voltages above VREF +100mV. Output Current Adjustment by PWM Control Directly driving ADJ input A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the ADJ pin, as shown below, to adjust the output current to a value above or below the nominal average value set by resistor RS: PWM VADJ ADJ 0V ZXLD1356 GND GND ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 19 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Driving the ADJ Input via Open Collector Transistor The recommended method of driving the ADJ pin and controlling the amplitude of the PWM waveform is to use a small NPN switching transistor as shown below: ADJ PWM ZXLD1356 GND GND This scheme uses the 50k resistor between the ADJ pin and the internal voltage reference as a pull-up resistor for the external transistor eg MMBT3904. Driving the ADJ Input from a Microcontroller Another possibility is to drive the device from the open drain output of a microcontroller. The diagram below shows one method of doing this: MCU 3.3k ADJ ZXLD1356 GND If the NMOS transistor within the microcontroller has high Gate / Drain capacitance, this arrangement can inject a negative spike into ADJ input of the ZXLD1356 and cause erratic operation but the addition of a Schottky clamp diode (eg Diodes Inc. SD103CWS) to ground and inclusion of a series resistor (3.3k) will prevent this. See the section on PWM dimming for more details of the various modes of control using high frequency and low frequency PWM signals. Shutdown Mode Taking the ADJ pin to a voltage below 0.2V for more than approximately 100µs will turn off the output and supply current to a low standby level of 65µA nominal. Note that the ADJ pin is not a logic input. Taking the ADJ pin to a voltage above VREF will increase output current above the 100% nominal average value. (See page 17 graphs for details). Soft-Start An external capacitor from the ADJ pin to ground will provide a soft-start delay, by increasing the time taken for the voltage on this pin to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. Adding capacitance increases this delay by approximately 0.2ms/nF. The graph on the next page shows the variation of soft-start time for different values of capacitor. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 20 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Soft-Start (cont.) Soft Start Time vs Capacitance from ADJ pin to Ground 16 14 Soft Start Time (ms) 12 10 8 6 4 2 0 -2 0 20 40 60 Capacitance (nf) 80 100 120 Actual Operating Waveforms [VIN = 60V, RS = 0.36V, L = 68µH, 22nF on ADJ] Soft-start operation. LX voltage (Ch2) and Output current (Ch3) using a 22nF external capacitor on the ADJ pin. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 21 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) VIN Capacitor Selection A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor appears in series with the supply source impedance and lowers overall efficiency. This capacitor has to supply the relatively high peak current to the coil and smooth the current ripple on the input supply. To avoid transients into the IC, the size of the input capacitor will depend on the VIN voltage: VIN = 6 to 40V CIN = 2.2µF VIN = 40 to 50V CIN = 4.7µF VIN = 50 to 60V CIN = 10µF When the input voltage is close to the output voltage the input current increases which puts more demand on the input capacitor. The minimum value of 2.2µF may need to be increased to 4.7µF; higher values will improve performance at lower input voltages, especially when the source impedance is high. The input capacitor should be placed as close as possible to the IC. For maximum stability over temperature and voltage, capacitors with X7R, X5R, or better dielectric is recommended. Capacitors with Y5V dielectric are not suitable for decoupling in this application and should NOT be used. When higher voltages are with CIN = 10µF, an electrolytic capacitor can be used provided that a suitable 1mF ceramic capacitor is also used and positioned as close to the VIN pin as possible. A suitable capacitor would be NACEW100M1006.3x8TR13F (NIC Components). The following web sites are useful when finding alternatives: www.murata.com www.niccomp.com www.kemet.com Inductor Selection Recommended inductor values for the ZXLD1356 are in the range 68 µH to 220 µH. Higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays, which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller change in output current over the supply voltage range. (see graphs pages 10-16). The inductor should be mounted as close to the device as possible with low resistance connections to the LX and VIN pins. The chosen coil should have a saturation current higher than the peak output current and a continuous current rating above the required mean output current. Suitable coils for use with the ZXLD1356 may be selected from the MSS range manufactured by Coilcraft, or the NPIS range manufactured by NIC components. The following websites may be useful in finding suitable components. www.coilcraft.com www.niccomp.com www.wuerth-elektronik.de The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off' times within the specified limits over the supply voltage and load current range. Figures 3 and 4 (following) can be used to select a recommended inductor based on maintaining the ZXLD1356 case temperature below 60°C for the different package types. For detailed performance characteristics for the inductor values 68, 100, 150 and 220µH see graphs on pages 10-16. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 22 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Inductor Selection (cont.) Minimum Recommended Inductor 2% Accuracy, <60°C Case Temperature 15 Legend 14 68uH 13 100uH 12 150uH Number of LEDs 11 220uH 10 9 8 7 6 5 4 3 2 1 0 10 20 30 40 50 60 Supply Voltage (V) Figure 3. ZXLD1356 Minimum Recommended Inductor Diode Selection For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode* with low reverse leakage at the maximum operating voltage and temperature. They also provide better efficiency than silicon diodes, due to a combination of lower forward voltage and reduced recovery time. It is important to select parts with a peak current rating above the peak coil current and a continuous current rating higher than the maximum output load current. It is very important to consider the reverse leakage of the diode when operating above 85°C. Excess leakage will increase the power dissipation in the device and if close to the load may create a thermal runaway condition. The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak voltage on the LX output. If a silicon diode is used, care should be taken to ensure that the total voltage appearing on the LX pin including supply ripple, does not exceed the specified maximum value. *A suitable Schottky diode would be B1100B (Diodes Inc). ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 23 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Reducing Output Ripple Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor, Cled, across the LED(s) as shown below: D1 Rs VIN LED Cled L1 V IN ISENSE LX ZXLD1356 A value of 1µF will reduce the supply ripple current by a factor three (approx.). Proportionally lower ripple can be achieved with higher capacitor values. Note that the capacitor will not affect operating frequency or efficiency, but it will increase start-up delay, by reducing the rate of rise of LED voltage. By adding this capacitor the current waveform through the LED(s) changes from a triangular ramp to a more sinusoidal version without altering the mean current value. Operation at Low Supply Voltage Below the under-voltage lockout threshold (VSD) the drive to the output transistor is turned off to prevent device operation with excessive onresistance of the output transistor. The output transistor is not full enhanced until the supply voltage exceeds approximately 17V. At supply voltages between VSD and 17V care must be taken to avoid excessive power dissipation due to the on-resistance. Note that when driving loads of two or more LEDs, the forward drop will normally be sufficient to prevent the device from switching below approximately 6V. This will minimize the risk of damage to the device. Thermal Considerations When operating the device at high ambient temperatures, or when driving maximum load current, care must be taken to avoid exceeding the 2 package power dissipation limits. The graph below gives details for power derating. This assumes the device to be mounted on a (25mm) PCB with 1oz copper standing in still air. Maximum Power Dissipation 2 1.8 DFN3030-6 Power Dissipation (W) 1.6 1.4 1.2 1 0.8 TSOT23-5 0.6 0.4 0.2 0 -40 ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 -25 -10 5 20 35 50 65 Ambient Temperature (°C) 24 of 29 www.diodes.com 80 95 110 125 140 October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Thermal Considerations (cont.) Note that the device power dissipation will most often be a maximum at minimum supply voltage. It will also increase if the efficiency of the circuit is low. This may result from the use of unsuitable coils, or excessive parasitic output capacitance on the switch output. Thermal Compensation of Output Current High luminance LEDs often need to be supplied with a temperature compensated current in order to maintain stable and reliable operation at all drive levels. The LEDs are usually mounted remotely from the device so, for this reason, the temperature coefficients of the internal circuits for the ZXLD1356 have been optimized to minimize the change in output current when no compensation is employed. If output current compensation is required, it is possible to use an external temperature sensing network - normally using Negative Temperature Coefficient (NTC) thermistors and/or diodes, mounted very close to the LED(s). The output of the sensing network can be used to drive the ADJ pin in order to reduce output current with increasing temperature. Layout Considerations LX pin The LX pin of the device is a fast switching node, so PCB tracks should be kept as short as possible. To minimize ground 'bounce', the ground pin of the device should be soldered directly to the ground plane. Coil and Decoupling Capacitors and Current Sense Resistor It is particularly important to mount the coil and the input decoupling capacitor as close to the device pins as possible to minimize parasitic resistance and inductance, which will degrade efficiency. It is also important to minimize any track resistance in series with current sense resistor RS. Its best to connect VIN directly to one end of RS and Isense directly to the opposite end of RS with no other currents flowing in these tracks. It is important that the cathode current of the Schottky diode does not flow in a track between RS and VIN as this may give an apparent higher measure of current than is actual because of track resistance. ADJ Pin The ADJ pin is a high impedance input for voltages up to 1.35V so, when left floating, PCB tracks to this pin should be as short as possible to reduce noise pickup. A 100nF capacitor from the ADJ pin to ground will reduce frequency modulation of the output under these conditions. An additional series 3.3kΩ resistor can also be used when driving the ADJ pin from an external circuit (see below). This resistor will provide filtering for low frequency noise and provide protection against high voltage transients. 3.3k ADJ 100nF ZXLD1356 GND GND High Voltage Tracks Avoid running any high voltage tracks close to the ADJ pin, to reduce the risk of leakage currents due to board contamination. The ADJ pin is soft-clamped for voltages above 1.35V to desensitize it to leakage that might raise the ADJ pin voltage and cause excessive output current. However, a ground ring placed around the ADJ pin is recommended to minimize changes in output current under these conditions. Evaluation Boards ZXLD1356 evaluation boards are available on request, which have connection terminals that allow customers to connect their own LED products to the board. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 25 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Application Information (cont.) Dimming Output Current Using PWM Low Frequency PWM Mode When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage VADJ and a low level of zero, the output of the internal low pass filter will swing between 0V and VADJ, causing the input to the shutdown circuit to fall below its turn-off threshold (200mV nom) when the ADJ pin is low. This will cause the output current to be switched on and off at the PWM frequency, resulting in an average output current IOUTavg proportional to the PWM duty cycle. (See Figure 4 - Low frequency PWM operating waveforms). Figure 4. Low Frequency PWM Operating Waveforms The average value of output current in this mode is given by: IOUTavg = 0.2DPWM RS for DPWM > 0.001 This mode is preferable if optimum LED 'whiteness' is required. It will also provide the widest possible dimming range (approx. 1000:1) and higher efficiency at the expense of greater output ripple. ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 26 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Ordering Information Part mark 1356 1356 1356 Device ZXLD1356DACTC ZXLD1356ET5TA ZXLD1356QET5TA Note: Package Code DAC ET5 ET5 Packaging Reel size (inches) Reel Width (mm) Quantity per Reel Part Number Suffix Automotive Grade V-DFN3030-6 TSOT25 TSOT25 13 7 7 12 8 8 3000 3000 3000 TC TA TA Y (Note 9) 9. For Automotive grade with AEC-Q100 Grade 1 qualification the ZXLD1356QET5TA should be ordered. Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. 1 A V-DFN3030-6 3 A e n a l P g n i t a e S A D V-DFN3030-6 Dim Min Max Typ A 0.80 0.90 0.85 A1 0 0.05 A3 0.203 b 0.30 0.40 0.35 D 2.95 3.05 3.00 D2 1.95 2.05 2.00 E 2.95 3.05 3.00 E2 1.15 1.25 1.20 e 0.95 e1 1.90 L 0.45 0.55 0.50 All Dimensions in mm e L 2 D 2 E E ° 5 4 X 0 0 3 . 0 Dr Ie 1f #m a nh i P C b 1 e TSOT25 D e1 E E1 L2 c 4x θ1 e L θ 5x b A A2 A1 ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 27 of 29 www.diodes.com TSOT25 Dim Min Max Typ A 1.00 − − A1 0.01 0.10 − A2 0.84 0.90 − D 2.90 − − E 2.80 − − E1 1.60 − − b 0.30 0.45 − c 0.12 0.20 − e 0.95 − − e1 1.90 − − L 0.30 0.50 L2 0.25 − − θ 0° 8° 4° θ1 4° 12° − All Dimensions in mm October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. V-DFN3030-6 Y Dimensions 1 X 1 Y 2 Y C X X1 Y Y1 Y2 9 2 3 . 0 C Value (in mm) 0.950 0.450 2.100 0.630 1.300 3.160 X C TSOT25 C C Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Y1 Y (5x) X (5x) ZXLD1356/ ZXLD1356Q Document number: DS33470 Rev. 4 - 2 28 of 29 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated ZXLD1356/ ZXLD1356Q IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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