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RT9284A20GJ5 Datasheet(PDF) 3 Page - Richtek Technology Corporation

Part # RT9284A20GJ5
Description  Tiny Package, High Performance, Constant Current Switching Regulator for White LED
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9284A20GJ5 Datasheet(HTML) 3 Page - Richtek Technology Corporation

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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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