Microchip HV9923DB1 Handleiding

Bekijk gratis de handleiding van Microchip HV9923DB1 (2 pagina’s), behorend tot de categorie Niet gecategoriseerd. Deze gids werd als nuttig beoordeeld door 33 mensen en kreeg gemiddeld 4.0 sterren uit 5 reviews. Heb je een vraag over Microchip HV9923DB1 of wil je andere gebruikers van dit product iets vragen? Stel een vraag

Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9923DB1

A032913

HV9923DB1

Introduction

The Supertex HV9923DB1 demoboard is a complete LED

power driver to supply a string of LEDs using the HV9923,

an integrated 3-pin high input voltage constant-current

buck regulator IC. The HV9923 integrates a 500V switching

MOSFET and can operate directly from the rectied universal

AC line voltage range of 80 to 265VAC.

The current in the LED string is internally programmed to

30mA ±15%. The HV9923DB1 is ideally suited for driving

strings of LEDs having forward voltage from 20 to 30V at

high efciency (typically 80% at 120VAC).

The HV9923DB1 is a peak current-controlled buck converter

operating with xed off-time of 10.5us. Its xed off-time

control scheme provides good stability and tight regulation

of the LED current throughout the input AC line voltage

range. As its switching frequency varies over the AC line

cycle, the HV9923 inherently introduces frequency dither

and simplies the compliance with EMI regulations.

Specications

Board Layout and Connection Diagram

Universal Off-line

LED Driver Demoboard

Connections

LED+: Connect the Anode of the LED string to this pin.

LED-: Connect the Cathode of the LED string to this pin.

AC1, AC2: Connect AC Line to these pins.

Note:

The demoboard is not protected from output open/

short circuit condition. Damage to the demoboard may

occur if the output load is not properly connected.

L1

C0

D1 U1

CDD

CIN

LED-

D2

+

D3

D5

D4

CIN2

LIN

C2

HV9923

LED+

LED String

VF = 20 to 30V

IF = 30mA

AC Line

80 - 265VAC

Parameter Value

Input voltage range80 to 265VAC

Load current30mA ± 15%

LED string voltage20 - 30V

Conducted EMICISPR15

Efciency 80% typ.

Product specificaties