Datasheet LED Drivers for LCD Backlights White LED Driver for large LCD panel BD9397EFV General Description Features BD9397EFV is a high efficiency driver for white LEDs 6ch Constant LED drivers, available 400mA drive and designed for large LCD panel. This IC is built-in per 1ch. high current drive and high responsibility type 6ch LED Constant current accuracy 1.8% (IC only) drivers and 1ch boost DCDC converter. BD9397EFV Each 6ch external PWM inputs can control independent has some protect function against fault conditions, dimming . such as the over-voltage protection (OVP), LED OPEN Current analog (linear) dimming by VREF and SHORT protection, the over current limit 1ch boost controller with current mode (external FET) protection of DCDC (OCP). Therefore BD9397EFV is Several protection functions available for the fail-safe design over a wide range DCDC part : OCP/OVP/UVLO/TSD output voltage. LED driver part :OPEN,SHORT detection SHORT detection voltage is set by LSP terminal. Key Specification Error detection output FAIL terminal inside Operating power supply voltage range: 9.0V to 35.0V (normal=Open, error=Drain) Oscillator frequency: 500kHz (RT=30k) Operating Current: 9mA (typ.) Operating temperature range: -40C to +85C Package W(Typ.) D(Typ.) H(Max.) Applications HTSSOP-B40 13.60mm x 7.80mm x 1.00mm TV, Computer Display, Notebook, LCD Backlighting Pin Pitch: 0.65mm Typical Application Circuit Vin Cin + Cout REG9V UVLO OVP VCC VCC VREG UVLO STB UVLO TSD OVP SCP (VCC) CVCC FAIL FAIL MODE PROTECTION Logic CP FAIL RST Filter PWM REG9V COMP RT OSC + + N Control - Logic - PGND SS DRIVER SS Current Sense CS REG9V ERR M DET AMP - - LED1 FB - - + - RFB - + LED LV CFB S1 REG9V LSP OPEN/SHORT Detect VREF 1/5 + LED6 - PWM + - S6 PWM6 Figure 2. HTSSOP-B40 AGND N.C. AGND Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has not designed protection against radioactive rays . www.rohm.com TSZ02201-0F1F0C100330-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/27 TSZ2211114001 1.Sep.2015 Rev.006BD9397EFV DDatasheetatasheet BD9397EFV Absolute maximum ratings (Ta=25C) Parameter Symbol Ratings Unit Operating Temperature Range Ta(opr) -40 to +85 C Storage Temperature Range Tstg -55 to +150 C Power Dissipation Pd 4.7 *1 W Thermal resistance between junction and case jc 7 *2 C/W Maximum Junction Temperature Tjmax 150 C Maximum LED output current ILED 400 *3 *4 mA *1 In the case of mounting 4 layer glass epoxy base-plate of 70mm70mm1.6mm, 37.6mW is reduced at 1C above Ta=25. *2 In the case of mounting 4 layer glass epoxy base-plate of 70mm70mm1.6mm. *3 Wide VF variation of LED increases loss at the driver, which results in rise in package temperature. Therefore, the board needs to be designed with attention paid to heat radiation. *4 This current value is per 1ch. It needs be used within a range not exceeding Pd. Operating Ratings (Ta = 25C) Parameter Symbol Range Unit Power supply voltage VCC 9 to 35 V FCT 100 to 1250 *5 kHz DC/DC oscillation frequency VREF input voltage VREF 0.2 to 2.5 V LSP terminal input voltage VLSP 0.8 to 3 V FB terminal output voltage VFB 0 to 3.3 V M DET terminal output voltage VM DET 0 to REG9V V The operating conditions written above are constants of the IC unit. Be careful enough when setting the constant in the actual set. External Components Recommended Range Item Symbol Setting Range Unit VCC terminal connection capacitance CVCC 1.0 to 10 F Soft-start set capacitance SS 0.001 to 1.0 F Timer latch set capacitance CP 0.001 to 2.7 F Operating frequency set resistance RT 12 to 150 k REG9V terminal connection capacitance CREG9V 2.2 to 10 F The values described above are constants for a single IC. Adequate attention must be paid to setting of a constant for an actual set of parts Pin Configuration Physical Dimension Tape and Marking Diagram BD9397EFV Figure 4-1. SOP-24 LOT No. Figure 3. Figure 4. HTSSOP-B40 www.rohm.com TSZ02201-0F1F0C100330-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/27 TSZ2211115001 1.Sep.2015 Rev.006