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| GM9623 Datasheet, PDF (1/6 Pages) Gamma Microelectronics Inc. – Requires low inductance value | |||
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GM9623
350mA, High Voltage LED driver
with Build in Power FET
Description
GM9623 is a pulse width modulated (PWM) high
efficient operation of LED driver control IC with
internal high voltage power switching MOSFET.
Having HV MOSFET allows to use direct supply-
line voltage (220VAC or 320VDC). The LED string
is driven at constant current of 50mA, thus
providing constant light output and enhanced
reliability.
The GM9623 has constant time off PWM
architecture. The peak current control scheme
provides good regulation of the output current
throughout the universal AC line voltage range of
85 to 264VAC or DC input voltage of 20 to 400V.
GM9623 is designed and tuned for using low
inductance value (typically 4.7mH).
Features
 High input voltage from 85 to 265VAC
 Fixed DC output current â 350mA with 3%
accuracy
 Internal HV MOSFET switch with minimum
550V breakdown voltage
 Requires low inductance value (low cost)
 Available in SOT23 package
Applications
 LED Lamps with AC or DC operation
 LED decorations
Typical Application Circuit
 General purpose constant current source
AC Input
Co
L1
GM9623
D
CU
Gnd
LED 1
LED n
AC Input
T1
Co
GM9623
D
CU
Gnd
LED 1
LED n
Typical Non Isolated Application Circuit
Typical Isolated Application Circuit
www.gammamicro.com.tw 1
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