Datasheet LED Drivers for LCD Backlights White LED Driver for large LCD Panels (DCDC Converter type) BD9483F,FV General Description Features BD9483F,FV is a high efficiency driver for white LEDs 2ch boost DCDC converter with current mode and designed for large LCDs. This IC is built-in 2ch LED protection circuit (Max duty protection, LED boost DCDC converters that employ an array of LEDs OCP protection) as the light source. BD9483F,FV has some protect Over-voltage protection (OVP) for the output function against fault conditions, such as the voltage Vout over-voltage protection (OVP), the over current limit Adjustable soft start protection of DCDC (OCP), Max duty protection, LED The wide range of analog dimming 0.2V-3.0V OCP protection. Therefore BD9483F,FV is available for 2ch independent PWM dimming input the fail-safe design over a wide range output voltage. The UVLO detection for the input voltage of the Key Specification power stage Operating power supply voltage range:11.0V to 35.0V FAIL logic output Oscillator frequency: 150kHz (RT=100k) Operating Current: 3mA (typ.) Package Operating temperature range: -40C to +85C W(Typ.) D(Typ.) H(Max.) SOP-24: 15.00mm x 7.80mm x 2.01mm Applications Pin Pitch: 1.27mm TV, Computer Display, Notebook, LCD Backlighting Typical Application Circuit VOUT2 VOUT1 VCC VIN UVLO VCC OVP REG90 VCC Figure 2-1. SOP-24 VREG UVLO TSD OVP UVLO STB REG90 UVLO REG90 PWM GATE1 RT COMP OSC CONTROL LOGIC CS1 W(Typ.) D(Typ.) H(Max.) LEB Current PGND1 SSOP-B24: 7.80mm x 7.60mm x 1.35mm compensation Css SS SS REG90 Pin Pitch: 0.65mm DIMOUT1 SS-FB clamper LEDOCP Ccp CP Fail ISENSE1 detect 1.0V ERROR FAILB amp FB1 MAXFB PWM1 PWM2 Each channel GATE2 CS2 ADIM PGND2 1/3 DIMOUT2 ISENSE2 FB2 Figure 2-2. SSOP-B24 Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays . www.rohm.com TSZ02201-0F1F0C100100-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/29 TSZ2211114001 28.Nov.2013 Rev.003 + + - - - +DatasheetDatasheet BD9483F,FV 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 Maximum Junction Temperature Tjmax 150 C Power Dissipation *1 (SOP24) Pd1 687 mW Power Dissipation *2 (SSOP-B24) Pd2 1024 mW *1 In the case of mounting 1 layer glass epoxy base-plate of 70mm70mm1.6mm, 5.5mW is reduced at 1C above Ta=25. *2 In the case of mounting 1 layer glass epoxy base-plate of 70mm70mm1.6mm, 8.2mW is reduced at 1C above Ta=25 Operating Ratings (Ta = 25C) Parameter Symbol Range Unit Power supply voltage VCC 11.0 to 35.0 V DC/DC oscillation frequency fsw 50 to 800 kHz The effective range of ADIM signal VADIM 0.2 to 3.0 V PWM input frequency FPWM 40 to 50k Hz 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 REG90 pin connection capacitance CREG90 1.0 to10 F Soft start connection capacitance CSS 0.001 to 4.7 F RT pin connection resistance RRT 15 to 300 k The assumed capacitance of GATE pin CGATE to 1000 pF 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 BD9483F Lot No. Figure 4-1. SOP-24 D9483FV Figure 3. Lot No. Figure 4-2. SSOP-B24 www.rohm.com TSZ02201-0F1F0C100100-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/29 TSZ2211115001 28.Nov.2013 Rev.003