rt8450 Richtek Technology Corporation, rt8450 Datasheet
rt8450
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rt8450 Summary of contents
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... High Voltage Multi-Topology LED Driver General Description The RT8450 is a current mode PWM regulator for LED driving applications. With an 1.5A switch on board and wide input (4.5V to 40V) and/or output (up to 60V)ranges the RT8450 can operate in any of the three common topologies : Buck, Boost or Buck-Boost. With a 1MHz operating frequency, the external PWM inductor and input/output capacitors can all be small ...
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... RT8450_D3-12_V3 : Buck Converter Specification Parameter Operation voltage Range Enable Threshold voltage LED current (R =0.47Ω) SENS V Threshold voltage ACTL Current Sense Amplifier Input Threshold Voltage Regulated V LED OVP Threshold voltage Operation Frequency Boost OCP (I peak) SW ER-RT8450-0308-A April 2008 RT8450 Evaluation Board Buck Converter Efficiency vs. Input Voltage ...
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... RT8450_D3-12_V2 : Boost Converter Application Schematic TP2 TP1 ISP ISN R3 NC ISP TP3 R4 VC ISN 0 VC TP5 R14 ACTL ACTL DCTL R16 10K R19 0 3.3nF 0.47uF EN GP4 DCTL VIN TP4 EN R13 100K R15 100k EN ACTL R18 10K R8 10K Bill of Materials Reference Qty. ...
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... Connect control voltage or PWM signal to ACTL pin to control LED brightness. 4. Connect LED strings positive and negative to VOUT2 and GND respectively. 5. The maximum output current of LED strings can be set by RSENS. ILED= (190mV/ RSENS) ER-RT8450-0308-A April 2008 RT8450 Evaluation Board 3.3nF/16V/X7R 0.47uF/16V/X7R 10nF/50V/X7R Schottky Barrier Rectifiers 10uH, 2 ...
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... RT8450_D3-12_V3 : Buck Converter Application Schematic TP5 1 TP6 ISN 1 ISP TP7 VC ISP1 ISN1 VC1 TP8 ACTL ACTL1 R5 R6 DCTL 10K 0 EN1 3.3nF GP7 0.47uF DCTL EN1 VIN TP4 EN R9 100K R10 100k EN1 ACTL1 R8 10K R1 10K Bill of Materials Reference Qty. ...
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... Connect control voltage or PWM signal to ACTL pin to control LED brightness. 4. Connect LED strings positive and negative to LED+ and LED- respectively. 5. The maximum output current of LED strings can be set by RSENS. ILED= (190mV/ RSENS) ER-RT8450-0308-A April 2008 RT8450 Evaluation Board 3.3nF 0.47uF/16V/X7R 10nF/50V/X7R/0603 Schottky Barrier Rectifiers 10uH, 2 ...
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... More Information For more information, please find the related datasheet or application notes from Richtek website: http://www.richtek.com Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 ER-RT8450-0308-A April 2008 RT8450 Evaluation Board RichTek Conceptual www.richtek.com ...