BD18345EFV-ME2 ROHM

Datasheet Constant Current LED Drivers Constant Current Controller for Automotive LED Lamps BD18345EFV-M General Description Key Specifications BD18345EFV-M is 70 V-withstanding constant current Input Voltage Range: 4.5 V to 19.0 V controller for automotive LED lamps. It is able to drive at FB Pin Voltage Accuracy: 650 mV 3 % maximum 10 rows of PNP transistors. It can also Ta=25 C to 125 C contribute to reduction in the consumption power of the Stand-by Current: 0 A (Typ) set as it has the built-in standby function. The IC provides LED Current De-rating Accuracy: high reliability because it has two Current de-rating DCDIM Pin : 3 % V =0.75 V to 2.00 V DCDIM function, LED open detection, short circuit protection, THD Pin : 6 % V =0.50 V to 0.75 V THD over voltage mute function and LED failure input/output Operating Temperature Range: -40 C to +125 C function. Package W (Typ) x D (Typ) x H (Max) Features HTSSOP-B20 6.50 mm x 6.40 mm x 1.00 mm (Note 1) AEC-Q100 Qualified PWM Dimming Function PWM Signal Output LED Current DC Dimming Thermal De-rating Function LED Open Detection Short Circuit Protection (SCP) Over Voltage Mute Function (OVM) Disable LED Open Detection Function at Reduced-Voltage LED Failure Input/Output Functions (PBUS) HTSSOP-B20 (Note 1) Grade1 Applications Automotive LED Exterior Lamp (Rear Lamp, Turn Lamp, DRL/Position Lamp, Fog Lamp etc.) Automotive LED Interior Lamp (Air Conditioner Lamp, Interior Lamp, Cluster Light etc.) Typical Application Circuit RFB1 RFB2 VIN FB PWM in D1 RLIM ZD1 CVIN1 CVIN2 EN BASE D2 CRT OP DC in D3 CCRT RCRT SCP CLED DISC BD18345EFV-M RDCIN D VREG CD CVREG RDCDIM1 DCDIM PWMOUT RDCDIM2 OPM PBUS ROPM RTHD GND THD NTC Product structure : Silicon integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0T3T0B300040-1-2 2018 ROHM Co., Ltd. All rights reserved. 1/37 TSZ22111 14 001 21.Sep.2018 Rev.001 BD18345EFV-M Pin Configuration (TOP VIEW) FB VIN 1 20 BASE N.C. 2 19 N.C. 3 18 EN OP N.C. 4 17 SCP DISC 5 16 EXP-PAD GND CRT 6 15 PBUS 7 14 D N.C. DCDIM 8 13 THD VREG 9 12 PWMOUT OPM 10 11 Pin Description Pin No. Pin Name Function 1 FB Feedback voltage input 2 BASE Connecting PNP Tr. BASE (Note 1) 3 N.C. No internal connection 4 OP LED open detection input 5 SCP Short circuit protection input 6 GND GND 7 PBUS Output for fault flag / Input to disable output current (Note 1) 8 N.C. No internal connection 9 THD Connecting resistor for thermal de-rating setting 10 PWMOUT PWM signal output 11 OPM Connecting resistor for disable LED open detection voltage setting at reduced voltage 12 VREG Internal reference voltage output 13 DCDIM Connecting resistor for DC dimming setting 14 D Connecting capacitor for disable LED open detection time setting 15 CRT Connect capacitor and resistor to set output current ON Duty 16 DISC Connecting resistor to set output current on time (Note 1) 17 N.C. No internal connection 18 EN Enable input (Note 1) 19 N.C. No internal connection 20 VIN Power supply input - EXP-PAD The EXP-PAD connect to GND. (Note 1) Leave this pin unconnected www.rohm.com TSZ02201-0T3T0B300040-1-2 2018 ROHM Co., Ltd. All rights reserved. 2/37 TSZ22111 15 001 21.Sep.2018 Rev.001