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RT9285CGJ6 Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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RT9285CGJ6 Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 13 page RT9285C Preliminary 2 DS9285C-00 August 2007 www.richtek.com Function Pin Description Pin No. XDFN/WDFN-8L TSOT-23-6 Pin Name Pin Function 1, Exposed Pad (9) 2 GND Ground Pin. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 2 1 LX LX Pin. Connect this Pin to an inductor. Minimize the track area to reduce EMI. 3 -- NC No Internal Connection. 4 -- PGND Power Ground Pin. 5 6 VDD Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the input ripple. 6 5 VOUT Output Voltage pin. The pin internally connects to OVP diode to limit output voltage while LEDs are disconnected. 7 4 EN Chip Enable (Active High). Note that this pin has an internal pull-down resistance around 300k Ω. 8 3 FB Feedback Pin. Series connecting a resistor between WLED and ground as a current sense. Sense the current feedback voltage to set the current rating. Typical Application Circuit LX GND VDD FB VOUT RT9285C EN C1 1uF RSET L1 10uH to 22uH 12.5 C2 0.22uF to 1uF Chip Enable VIN 2.7V to 5.5V PGND PGND pin for XDFN/WDFN-8L Packages Figure 1. Operation of Digital Pulse Dimming Control IWLED 0.5us < tLO < 300us 0.5us < tHI 15/16 14/16 13/16 12/16 3/16 1/16 2/16 100% 100% 15/16 0 1234 5 14 15 01 EN Shutdown Shutdown |
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