BD8381AEFV-ME2

Datasheet LED Drivers for Automotive Light BD8381AEFV-M General Description Key Specifications  Input Supply Voltage Range:  Operating Temperature Range: BD8381AEFV-M is a white LED driver with the capability of withstanding high input voltage (50V MAX). It has also an integrated current-mode, buck-boost DC/DC controller to achieve stable operation against high input voltage and to remove the constraint of the number of LEDs in series connection. The LED brightness is controlled by either linear or PWM signal and is also possible to be controlled even without using a microcomputer, but instead, by means of the built-in PWM brightness signal generation circuit. Package 5.0V to 30V -40°C to +125°C W(Typ) x D(Typ) x H(Max) Features      Integrated buck-boost current-mode DC/DC controller Built-in CR timer for PWM brightness PWM linear brightness Built-in protection functions (UVLO, OVP, TSD, OCP, SCP) LED error status detection function (OPEN/ SHORT) HTSSOP-B28 9.70mm x 6.40mm x 1.00mm Applications Headlight and Daytime Running Light etc. Typical Application Circuit and Block Diagram VREG Vin FAIL1 OVP UVLO VCC TSD COUT OVP OCP CS VREG Timer Latch EN PWM BOOT Control Logic OUTH DRV CTL SYNC OSC SLOPE SW PWM DGND RT VREG OUTL ERR AMP GND - COMP + SS VREG LEDR + OCP OVP SHORT Det LEDC SS PWMOUT THM INP1 FB INP2 DRLIN VREG OPEN/ SHORT/ SCP Detect DISC CR TIMER Open Det VTH Timer Latch FAIL2 CT PGND 〇Product structure: Silicon monolithic integrated circuit .www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111 • 14 • 001 SCP Det 〇This product has no designed protection against radioactive rays 1/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Pin Configuration (TOP VIEW) 1 28 2 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 Pin Descriptions Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Symbol COMP SS VCC EN RT SYNC GND THM FB DISC VTH DRLIN FAIL1 FAIL2 OVP LEDC LEDR N.C. PGND PWMOUT CT OUTL DGND SW OUTH CS BOOT VREG www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Function Error amplifier output Soft start setting input Input power supply Enable input Oscillation frequency-setting resistance input External synchronization signal input Small-signal GND Thermally sensitive resistor connection pin ERRAMP FB signal input pin CR Timer discharge pin CR Timer threshold pin DRL switch pin (Pulse output setting pin) Failure signal output LED open/short detection signal output Over-voltage detection input LED short detection pin (LED detection side) LED short detection pin (Resistor detection side) PWM brightness source pin PWM brightness signal output pin GND short protection timer setting pin Low-side external FET Gate Drive out put Low-side FET driver source pin High-side FET Source pin High-side external FET Gate Drive out put DC/DC output current detection pin High-side FET driver source pin Internal reference voltage output 2/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Absolute Maximum Ratings (Ta=25°C) Parameter Symbol Rating Unit VCC 50 V VBOOT 55 V VSW, VCS, VOUTH 50 V VBOOT-SW 7 V -0.3 to +7 < VCC V Power Supply Voltage Boot Voltage SW,CS,OUTH Voltage BOOT-SW Voltage VREG,OVP,OUTL,FAIL1,FAIL2,THM,SS, COMP,RT,SYNC,EN,DISC,VTH,FB,LEDR, LEDC,DRLIN, PWMOUT,CT Voltage VREG, VOVP, VOUTL, VFAIL1, VFAIL2, VTHM, VSS, VCOMP, VRT, VSYNC, VEN, VDISC, VVTH, VFB, VLEDR, VLEDC, VDRLIN, VPWMOUT, VCT Power Consumption Pd 1.45 (Note 1) W Operating Temperature Range Topr -40 to +125 °C Storage Temperature Range Tstg -55 to +150 °C Tjmax 150 °C Junction Temperature (Note 1) IC mounted on glass epoxy board measuring 70mm x 70mm x 1.6mm, power dissipated at a rate of 11.60mW/°C at temperatures above 25°C. Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings.. Recommended Operating Conditions (Ta=25°C) Parameter Symbol Rating Unit Power Supply Voltage VCC 5.0 to 30 V Oscillating Frequency Range fOSC 100 to 600 kHz fSYNC fOSC to 600 kHz fSDUTY 40 to 60 % External Synchronization Frequency Range (Note 2) (Note 3) External Synchronization Pulse Duty Range (Note 2) Connect SYNC to GND or OPEN when not using external frequency synchronization. (Note 3) Do not switch between internal and external synchronization when an external synchronization signal is input to the device. www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Electrical Characteristics (Unless otherwise specified, VCC=12V Ta=25°C) Parameter Circuit Current Standby Current [VREG Block (VREG)] Reference Voltage [OUTH Block] OUTH High-Side ON-Resistance OUTH Low-Side ON-Resistance Over-Current Protection Operating Voltage SS Charge Current [OUTL Block] OUTL High-Side ON-Resistance OUTL Low –Side ON-Resistance [SW Block] SW Low -Side ON-Resistance [PWMOUT Block] PWMOUT High-Side ON-Resistance PWMOUT Low-Side ON-Resistance [Error Amplifier Block] Reference Voltage1 Reference Voltage2 The Amount of Change of VREF by Temperature COMP Sink Current COMP Source Current Max Duty Output [Oscillator Block] Oscillating Frequency [OVP Block] Over-Voltage Detection Reference Voltage OVP Hysteresis Width [UVLO Block ] UVLO Voltage UVLO Hysteresis Width [PWM Generation Circuit Block] VTH Threshold Voltage VTH Threshold Voltage PWM Minimum ON Width LED OPEN Detection Function LED SHORT Detection Function LED GND Short Protection Timer [Logic Inputs] Input HIGH Voltage Input LOW Voltage Input Current 1 Input Current 2 [FAIL Output (Open Drain) ] Fail LOW Voltage www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Min Limit Typ Max ICC - 4.5 7.0 mA ISTBY - 0 8 µA EN=Hi, SYNC=Hi, RT=OPEN, CIN=10µF EN=Low VREG 4.5 5.0 5.5 V IREG=-5mA, CREG=10µF RONHH RONHL 3.5 2.5 VCC -0.60 5 7.0 5.0 VCC -0.52 7 Ω Ω ION=-10mA ION=10mA ISS 1.5 1.0 VCC -0.68 3 µA VSS=0V RONLH RONLL 2.0 1.0 4.0 2.5 8.0 5.0 Ω Ω ION=-10mA ION=10mA RONSW 2.0 4.5 9.0 Ω IONSW=10mA RONPWMH RONPWML 2.0 1.0 4.0 2.5 8.0 5.0 Ω Ω IONPWMH=-10mA IONPWML=10mA VREF1 VREF2 0.194 0.190 0.200 0.200 0.206 0.210 V V FB-COMP Short,1MΩ/250kΩ dVREF2 -0.090 -0.045 -0.003 mV/°C ICOMPSINK ICOMPSOURCE Dmax 50 -100 83 75 -75 90 100 -50 - µA µA % fOSC 285 300 315 KHz VOVP 1.9 2.0 2.1 V VOVP=Sweep up VOHYS 0.45 0.55 0.65 V VOVP= Sweep down VUVLO VUHYS 4.0 50 4.35 150 4.7 250 V mV VCC= Sweep down VCC= Sweep up VTH1 VTH2 tPWMON VOPEN VSHORT tSHORT 3 1 25 30 100 100 2/3VREG 1/3VREG 50 200 150 3.7 2 70 400 200 V V µs mV mV ms VSHORT ≥ lVLEDR-VLEDCl CCT=0.1µF VINH VINL IIN IEN 3.0 GND 20 15 35 30 1.0 50 45 V V µA µA VIN=5V (SYNC/DRLIN) VEN=5V (EN) VOL - 0.1 0.2 V IOL=0.1mA Symbol VOLIMIT 4/36 Unit Conditions V FB-COMP Short,1MΩ/250kΩ Ta=-40°C to +125°C VFB=0.4V, VCOMP=1V VFB=0V, VCOMP=1V fOSC=300kHz RRT=200kΩ TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Typical Performance Curves (Unless otherwise specified, Ta=25°C) 6 700 VCC=12V Oscillating Frequency: fOSC [kHz] Output Voltage: VREG [V] 600 4 2 500 RRT=100kohm 400 300 200 RRT=200kohm 100 0 0 0 5 10 15 20 25 30 35 40 45 -50 50 -25 0 25 50 75 100 125 TEMPERATURE: [℃] Temperature: TaTa[°C] VCC Voltage: Power Supply Voltage: [V] VCC [V] Figure 2. Oscillating Frequency vs Temperature (fOSC Temperature Characteristic) Figure 1. Output Voltage vs Power Supply Voltage (VREG Voltage Characteristic) 0.22 8.0 VCC=12V 0.21 Circuit Current: ICC [mA] Output Voltage: VCC-VCS [V] 0.215 0.205 0.2 0.195 0.19 6.0 4.0 2.0 0.185 0.18 -50 0.0 -25 0 25 50 75 100 0 125 10 15 20 25 30 35 40 45 50 [V] PowerSupply SupplyVoltage: Voltage:VV [V] CCCC Temperature: Ta [°C] Figure 4. Circuit Current vs Power Supply Voltage Figure 3. Output Voltage vs Temperature (Standard Voltage Temperature Characteristic) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5 5/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Typical Performance Curves – continued (Unless otherwise specified, Ta=25°C) 0.66 100 90 Buck VOUT=6V 0.62 0.60 0.58 VVCC=12V CC= 12V Efficiency [%] 85 Efficiency [%] Output Voltage: VCC-VCS [V] 0.64 ILED=0.6A Boost VOUT=24V 95 80 Buck-Boost VOUT=14V 75 70 0.56 65 0.54 60 -50 -25 0 25 50 75 100 6 125 21 Figure 6. Efficiency vs Power Supply Voltage (Input Voltage Dependence) Figure 5. Output Voltage vs Temperature (Overcurrent Detection Voltage Temperature Characteristic) 10 250 VCC=12V 200 150 100 50 VCC=12V PWMOUT Output Voltage: [V] [V] PWMOUT OUTPUT VOLTAGE Reference Voltage: VREF [mV] 12 15 18 SUPPLY VOLTAGE:Vcc [V] Power Supply Voltage: VCC [V] Temperature: Temperature: Ta Ta [°C] [℃] REFERENCEVOLTAGE :VREF [mV] 9 8 6 4 2 1/3VREG 2/3VREG 0 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 THMVoltage: VOLTAGE:THM[V] THM THM [V] 5 VTH Voltage: VVTH [V] Figure 8. PWMOUT Output Voltage vs VTH Threshold Voltage Figure 7. Reference vs THM Voltage Figure Voltage 7. THM Gain (THM Gain) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 1 2 3 4 VTH VOLTAGE:VVTH [V] VTH Voltage: VVTH [V] 6/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Typical Performance Curves – continued (Unless otherwise specified, Ta=25°C) 10 VCC=12V VCC=12V Ta=25°C Ta=-40°C Output Voltage: VREG [V] 8 OUTPUT VOLTAGE:VREG [V] Output Voltage: VPWMOUT [V] OUTPUT VOLTAGE:PWMOUT [V] 10 Ta=125°C 6 4 2 0 Ta=25°C 8 Ta=125°C 6 4 2 0 0 1 2 3 4 DRLIN VOLTAGE:VDRLIN DRLIN Voltage: VDRLIN [V][V] 5 0 Over-Voltage Detection Reference Voltage: VOVP [V] 5.5 VCC=12V 5.4 Over voltage detection voltage: VOVP[V] 5.3 OUTPUT Voltage: VREG[V] 5.2 5.1 5 4.9 4.8 4.7 4.6 4.5 -50 -25 0 25 50 75 TEMPERATURE:Ta [℃] 100 125 2 3 4 ENEN VOLTAGE:VEN Voltage: VEN [V][V] 5 2.15 VCC=12V 2.1 2.05 2 1.95 1.9 1.85 -50 -25 0 25 50 75 TEMPERATURE:Ta [℃] 100 125 Temperature: Ta [°C] Temperature: Ta [°C] Figure 12. Over-Voltage Detection Reference Voltage vs Temperature (OVP Voltage Temperature Characteristic) Figure 11. Output Voltage vs Temperature (VREG Voltage Temperature Characteristic) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 1 Figure 10. Output Voltage vs EN Threshold Voltage (DRLIN=VREG) Figure 9. Output Voltage vs DRLIN Threshold Voltage Output Voltage: VREG [V] Ta=-40°C 7/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Typical Performance Curves – continued (Unless otherwise specified, Ta=25°C) 400 60 55 50 45 40 35 30 -50 -25 0 25 50 75 TEMPERATURE:Ta [℃] 100 250 200 150 -25 0 25 50 75 TEMPERATURE:Ta [℃] 100 125 Temperature: Ta [°C] Temperature: Ta [°C] Figure 13. LED Open Detection Voltage vs Temperature www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 300 100 -50 125 VCC=12V VLEDR=2V 350 LED short detection voltage: Vshort[mV] LED Short Detection Voltage: VSHORT [mV] VCC=12V 65 LED open detection voltage: Vopen[mV] LED Open Detection Voltage: VOPEN [mV] 70 Figure 14. LED Short Detection Voltage vs Temperature 8/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M Application Information 1. Application Circuit Application Circuit 1 VREG Vin FAIL1 OVP UVLO VCC TSD COUT OVP OCP CS VREG Timer Latch EN PWM BOOT Control Logic OUTH DRV CTL SYNC SW PWM SLOPE OSC DGND RT VREG OUTL ERR AMP GND - COMP + SS LEDR + OCP OVP SHORT Det LEDC SS VREG PWMOUT THM INP1 FB INP2 DRLIN VREG OPEN/ SHORT/ SCP Detect CR TIMER DISC Open Det VTH Timer Latch FAIL2 SCP Det PGND CT Figure 15 Buck application composition (It is INP1, INP2 and two input selector function and EN connected direct to VCC) Application Circuit 2 VREG Vin FAIL1 OVP UVLO VCC TSD COUT OVP OCP CS VREG Timer Latch EN PWM BOOT Control Logic OUTH DRV CTL SYNC OSC SLOPE SW PWM DGND RT VREG OUTL ERR AMP GND - COMP SS LEDR + OCP OVP VREG VREG + SHORT Det 30kΩ LEDC 20kΩ SS PWMOUT THM FB DRLIN VREG OPEN/ SHORT/ SCP Detect DISC CR TIMER Open Det VTH Timer Latch SCP Det FAIL2 CT PGND Figure 16 Boost application composition (When invalidating short detection and EN is inputted by a voltage divider) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M 2. Reference PCB Setting VCC CVCC1 CVCC3 CVCC2 VREG COMP VREG SS BOOT VREG CREG CCS RCS2 RPC RCS1 CPC CSS SYNC DGND GND OUTL ROUTL ROVP1 RTHM21 THM1 VOUT COUT1 SYNC DI2 RSW1 DGND RLEDR1 SW TR RLEDR2 RT CBOOT COUT2 RRT OUTH RSW2 RTHM3 RTHM11 GND CS EN RQ1 SW1 EN ROVP2 VCC VREG VREG RCS3 LEDOUT CCT THM FB CCR VTH VTH SW2 RFL1 PGND PGND N.C. DRLIN LEDR FAIL1 LEDC FAIL2 OVP RSENSE2 THM2 RCR2 RSENSE1 RCR1 PWMOUT DISC RQ3 CT LEDR LEDC VREG RFL2 FAIL1 FAIL2 Figure 17 VCC=8V to 16V, VOUT=16V, ILED=1A, fOSC=300kHz, PWM dummign25%, PWM Frequency 130Hz No. Component Name Component Value Component Product Name No. 23 CCS N.M - 24 CBOOT 0.1μF GCM188R11H104KA42 Name Component Value Product Name 1 CVCC1 10μF 2 CVCC2 10μF GCM32ER71E106KA42 GCM32ER71E106KA42 3 CVCC3 0.1μF GRM31CB31E104KA75B 25 Q1 RSS070N05 - 4 CPC 0.1μF GCM188R11H104KA42 26 DI1 RB050L-40 - 5 RPC MCR03 Series 27 RSW1 6 CSS GCM188R11H104KA42 28 RSW2 N.M 7 RRT 200kΩ MCR03 Series 29 RQ1 N.M - 8 RTHM11 100kΩ MCR03 Series 30 L 10μH SLF12575T100M5R4-H 820Ω 0.1μF 0Ω - 9 RTHM12 100kΩ MCR03 Series 31 ROUTL 10 RTHM21 100kΩ MCR03 Series 32 Q2 RSS070N05 11 RTHM22 100kΩ MCR03 Series 33 DI2 RF201L2S - 12 RTHM3 0Ω - 34 COUT1 10μF GCM32ER71E106KA42 - 0Ω - MCR03 Series - 13 TR 35 COUT2 10μF GCM32ER71E106KA42 14 RCR1 30kΩ MCR03 Series 36 CCT 0.1μF GCM188R11H104KA42 15 RCR2 10kΩ MCR03 Series 37 ROVP1 270kΩ 16 CCR GCM21BR11H224KA01 38 ROVP2 30kΩ 17 FRL1 100kΩ MCR03 Series 39 RLEDR1 90kΩ 18 FRL2 100kΩ MCR03 Series 39 RLEDR2 30kΩ 19 CREG 10μF GCM32ER71E106KA42 40 Q3 20 RCS1 110mΩ MCR100JZHFSR110 41 RQ3 RSS070N0 5 N.M 21 RCS2 N.M - 42 RSENSE1 200mΩ 22 RCS3 - 43 RSENSE2 N.M 0.22μF 0Ω MCR03 Series MCR03 Series MCR03 Series MCR03 Series MCR100JZHFSR510 - (Note)  When no PWM dimming, DI2 should be a schottky diode instead of a Fast Recovery diode to improve efficiency. When dimming with External PWM signal, DISC should be pulled up to VREG with 10KΩ,then input PWM signal to VTH.(when no PWM dimming, remove Q3 and replace RQ3=0Ω and short to DS）  Efficiency improvement is possible by making DI2 a schottky Diode .However, since high temperature leakage current is large and output voltage ripple is large as well, LED may flicker when PWM dimming ratio is very low. So it is recommended to use a Fast recovery Diode.  Values of the capacitors can be smaller than the amount that was selected by the DC bias characteristics of the capacitor when using ceramic capacitors.  For EMI reduction, please insert resistance to ROUTL and RBOOT. It is recommended to be below 20Ω.  The output voltage ripple is larger in Boost application than in Buck application. Hence, it is recommended to use at least 100µ F output capacitor. www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/36 TSZ02201-0T1T0C700160-1-2 31.Oct.2014 Rev.001 BD8381AEFV-M 3. 5V Voltage Reference (VREG) 5V (Typ) is generated from the VCC input voltage when the enable pin is set high. This voltage is used to power internal circuitry, as well as the voltage source for device pins that need to be fixed to a logical HIGH. UVLO protection is integrated into the VREG pin. The voltage regulation circuitry operates uninterrupted for output voltages higher than 4.5 V (Typ), but if output voltage drops to 4.3 V (Typ) or lower, UVLO engages and turns the IC off. Connect a capacitor (CREG = 10µF Typ) to the VREG terminal for phase compensation. Operation may become unstable if CREG is not connected. 4. LED Current Setting and Control Method. (1) Method of setting the LED current The LED current can be calculated by the following formula. THM ≥1.0V→ILED＝0.2V(Typ) / RSET THM