Datasheet LED Drivers for Automotive Light BD8381AEFV-M General Description Key Specifications BD8381AEFV-M is a white LED driver with the Input Supply Voltage Range: 5.0V to 30V capability of withstanding high input voltage (50V MAX). Operating Temperature Range: -40C to +125C It has also an integrated current-mode, buck-boost DC/DC controller to achieve stable operation against Package W(Typ) x D(Typ) x H(Max) 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. Features Integrated buck-boost current-mode DC/DC controller Built-in CR timer for PWM brightness PWM linear brightness HTSSOP-B28 Built-in protection functions (UVLO, OVP, TSD, OCP, 9.70mm x 6.40mm x 1.00mm SCP) LED error status detection function (OPEN/ SHORT) Applications Headlight and Daytime Running Light etc. Typical Application Circuit and Block Diagram VREG FAIL1 Vin OVP COUT UVLO TSD OVP OCP CS VCC VREG Timer EN Latch PWM BOOT Control Logic OUTH DRV SW CTL SYNC PWM SLOPE OSC DGND RT VREG OUTL ERR AMP GND - COMP + LEDR + SHORT OCP OVP LEDC Det SS SS VREG PWMOUT THM FB INP1 INP2 DRLIN VREG OPEN/ SHORT/ SCP Detect CR DISC TIMER Open Det VTH Timer Latch FAIL2 SCP Det CT PGND Product structure: Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0T1T0C700160-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/36 TSZ22111 14 001 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 Symbol Function 1 COMP Error amplifier output 2 SS Soft start setting input 3 VCC Input power supply 4 EN Enable input 5 RT Oscillation frequency-setting resistance input 6 SYNC External synchronization signal input 7 GND Small-signal GND 8 THM Thermally sensitive resistor connection pin 9 FB ERRAMP FB signal input pin 10 DISC CR Timer discharge pin 11 VTH CR Timer threshold pin 12 DRLIN DRL switch pin (Pulse output setting pin) 13 FAIL1 Failure signal output 14 FAIL2 LED open/short detection signal output 15 OVP Over-voltage detection input 16 LEDC LED short detection pin (LED detection side) 17 LEDR LED short detection pin (Resistor detection side) 18 N.C. - 19 PGND PWM brightness source pin 20 PWMOUT PWM brightness signal output pin 21 CT GND short protection timer setting pin 22 OUTL Low-side external FET Gate Drive out put 23 DGND Low-side FET driver source pin 24 SW High-side FET Source pin 25 OUTH High-side external FET Gate Drive out put 26 CS DC/DC output current detection pin 27 BOOT High-side FET driver source pin 28 VREG Internal reference voltage output www.rohm.com TSZ02201-0T1T0C700160-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/36 TSZ2211115001 31.Oct.2014 Rev.001