1

HIGH-VOLTAGE LED DRIVER

WITH BUILD-IN MOSFET SWITCH

FEATURES

▪

Operating temperature range -40 ..+85 ºС

▪

ON-resistance of the MOSFET switch

210 Ohm for ambient temperature 25 ºС

▪

OFF-state breakdown voltage of the

MOSFET switch not less 500 V for

Ambient temperature 25 ºC.

ORDERING INFORMATION

Device

Operating

Temperature Range

Package

Packing

HM9921T, HM9922T, HM9923T

TO-92

Tape

HM9921PR, HM9922PR, HM9923PR

SOT-89

Tape & Reel

DESCRIPTION

HM9921, HM9922, HM9923 are high-voltage LED driver control ICs with build-in MOSFET switch

and purposed for LED lighting control.

They allow efficient operation of LED strings from voltage sources ranging up to 400VDC.

The HM9921/2 includes an internal high-voltage switching MOSFET controlled with fixed off-time

TOFF of approximately 10µs. The LED string is driven at constant current, thus providing constant

light output and enhanced reliability. The output current is internally fixed at 20mA for HM9921,

50mA for HM9922 and 30mA for HM9923. The peak current control scheme provides good regulation

of the output current throughout the universal AC line voltage range of 85 to 264V AC or DC input

voltage of 20 to 400V.

PIN DESCRIPTION

Pin No

Symbol

Description

1

Drain

This is a drain terminal of the output switching MOSFET and a

linear Regulator input.

2

GND

This is a common connection for all circuits

3

This is a power supply pin for all control circuits.

Bypass this pin with a 0.1uF low impedance capacitor.

HM9921/2/3

2. GND

1.Drain

2.

1

2

3

1.Drain

2.GND

SOT-89

TO-92

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Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com