Microchip HV9980DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

HV9980DB1

Doc.# DSDB-HV9980DB1

A032913

General Description

The HV9980B1 demoboard is an RGB or multi-channel

white LED backlight driver designed to drive LEDs for

a large-screen TV. The HV9980DB1 can drive three

common-anode LED strings from a 100 - 140V input at

currents up to 70mA in steady state. It can also drive the

LEDs at currents as large as 160mA for short durations to

facilitate backlight scanning mode.

Each of the three channels can be individually controlled

by PWM dimming. The demoboard is also protected from

short circuit conditions across any string and recovers

automatically once the condition disappears.

Connection Diagram

3-Channel LED Array Driver IC

Specications

Parameter Value

Input voltage (VIN)100 - 140V

IC supply voltage (VDD)6.0 - 10V

Output voltage20V (min)

< ½ of input voltage (max)

Output current (steady state)70mA (max)

Output current (short durations)160mA (max)

Switching frequency (requires an

external 1.8MHz clock signal)300kHz

REF input0 - 1.0V

Output current ripple (typ)<5% peak - peak

Efciency (@ 120V input and

40V, 50mA output)~90%

Open LED protectionYES

Output short circuit protectionYES

Actual Board Size: 68.8mm x 36.1mm

+

-

+

-

120V

0 - 0.9V

8.0V

+

-

Product specificaties