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RT9284A20GJ5 Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT9284A20GJ5 Datasheet(HTML) 3 Page - Richtek Technology Corporation |
3 / 14 page 3 RT9284A/B DS9284A/B-05 August 2007 www.richtek.com Pin Description Pin No. TSOT-23-5 TSOT-23-6 Pin Name Pin Function 1 1 LX Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track area to reduce EMI. 2 2 GND Ground Pin 3 3 FB Feedback Reference Voltage Pin. Series connect a resistor between WLED and ground as a current sense. Sense the current feedback voltage to set the current rating. 4 4 EN Chip Enable (Active High). Voltage sensing input to trigger the function of over voltage protection. Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. -- 5 OVP Over Voltage Protection Pin. Voltage sensing input to trigger the function of over voltage protection. Leave it unconnected to disable this function. 5 6 VDD Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the input noise. Function Block Diagram Current Bias Soft Start OCP 750mA BandGap OVP UVLO Timer 5ms EN OVP VDD + - + - V REF PWM Logic 1.2MHz OSC GND FB LX V REF ibias Protection Circuit Buffer |
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