REG75 VCC N PGND AGND CS FAIL OVP RT LSP FB VREF SEL STB STB VREF BSx CLx PWMA PWMA PWMB PWMB PWMC PWMC Datasheet LED Drivers for LCD Backlights White LED Driver for large LCD Panels (DCDC Converter Type) BD9420F General Description Key Specifications BD9420F is high efficiency driver for white LED. This is VCC Supply Voltage Range: 9.0V to 35.0V designed for large sized LCD. BD9420F is built-in DCDC Oscillation Frequency: 150kHz(RT=100k) DCDC converter that supply appropriate voltage for Operation Circuit Current: 5mA(Typ) light source. Operating Temperature Range: -40C to +85C BD9420F is also built-in protection function for abnormal state such as OVP: over voltage protection, OCP: over current limit protection of DCDC, SCP: short Applications circuit protection, open detection of LED string. LED driver for TV, Monitor and LCD Back Light Thus this is used for conditions of large output voltage and load conditions. Package W(Typ) x D(Typ) x H(Max) SOP28 18.50mm x 9.90mm x 2.41mm Features Pin Pitch 1.27mm 6ch LED constant current driver(External PNP Tr Type) Maximum LED setting current 500mA(VREF Pin setting) 2% LED current accuracy(VREF=0.9V setting) Built-in DC/DC converter Analog Dimming(Linear) function Built-in PWM-independent soft start circuit LED protection function(OPEN/SHORT protection) PWM-independent Type Individual detection and individual LED OFF for both OPEN and SHORT circuit VOUT Over Voltage Protection(OVP) and reduced voltage protection(SCP) circuit Built-in under voltage lockout function(UVLO) and Figure 1. SOP28 over voltage protection(OVP) Built-in VOUT discharge circuit while shutdown Typical Application Circuit VIN PGND PGND REG75 COVP CREG75 REG75 AGND PGND AGND CVREF VCC CVCC AGND AGND REG75 PGND Figure 2. Typical Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0F1F0C100300-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/29 TSZ22111 14 001 20.Jun.2017 Rev.004 BD9420F Absolute Maximum Ratings(Ta = 25C) Parameter Symbol Rating Unit Supply Voltage VCC -0.3 to +36 V STB,OVP Voltage STB,OVP -0.3 to +36 V BS1-6 Voltage BS1-6 -0.3 to +60 V CS,CL1-6,FB,RT,LSP Voltage CS,CL1-6,FB,RT,LSP -0.3 to +7 V REG75,N Voltage REG75,N -0.3 to +14 V PWMA-C,SEL,VREF Voltage PWMA-C,SEL,VREF -0.3 to +20 V (Note 1) Power Dissipation for SOP28 Pd 0.75 W Operating Temperature Range Topr -40 to +85 C Storage Temperature Range Tstg -55 to +150 C Maximum Junction Temperature Tjmax 150 C (Note 1) Derating in done 6.0 mW/C for operating above Ta25C (Mount on 1-layer 70.0mm x 70.0mm x 1.6mm board) 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= -40C to +85C) Parameter Symbol Min Typ Max Unit Supply Voltage VCC 9 24 35 V DC/DC Oscillation Frequency FSW 100 - 800 kHz Analog Dimming Setting Input Range VREF 0.6 0.9 3.0 V LSP Setting Input Range VLSP 0.3 - 2.5 V External Component Recommended Range Parameter Symbol Specification unit VCC pin connecting capacity CVCC 1 to 100 uF REG75 pin connecting capacity C REG 1.0 to 10 uF RT pin connection resistance range RRT 18.75 to 150 k The operating conditions listed above are constants for the IC alone. To make constant setting with practical set devices, utmost attention should be paid. Pin Configuration Marking Diagram and Physical Dimension (TOP VIEW) 1 28 (REG75) (VCC) 2 27 (N) (STB) 3 26 (PGND) (AGND) 25 4 (CS) (RT) 5 24 (SEL) (OVP) 6 23 (FB) (PWMA) BD9420F 7 22 (LSP) (PWMB) 8 21 (VREF) (PWMC) 9 20 (BS1) (CL1) 10 19 (BS2) (CL2) 1PIN MARK 18 11 (BS3) (CL3) 12 17 (BS4) (CL4) LOT No. 13 16 (BS5) (CL5) 14 15 (BS6) (CL6) SOP28 Figure 3. Pin Configuration Figure 4. Physical Dimension www.rohm.com TSZ02201-0F1F0C100300-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/29 TSZ22111 15 001 20.Jun.2017 Rev.004