Microchip HV9931DB1 Manual

Microchip Ikke kategoriseret HV9931DB1

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Supertex inc.

www.supertex.com

HV9931DB1

Doc.# DSDB-HV9931DB1

A032713

The HV9931 LED driver is primarily targeted at low to

medium power LED lighting applications where galvanic

isolation of the LED string is not an essential requirement.

The driver provides near unity power factor and constant

current regulation using a two stage topology driven by

a single MOSFET and control IC. Triac dimming of this

design is possible with the addition of some components for

preloading and inrush current shaping.

The DB1 and DB2 Demoboards were designed for a xed

string current of 350mA and a string voltage of 40V for a load

power of about 14W. The boards will regulate current for an

output voltage down to 0V.

Nominal input voltage for the DB1 is 120VAC, for the DB2

230VAC. Design for universal input (85 to 265VAC) is by

all means possible but does increase cost and size while

lowering efciency.

The input EMI lter was designed to suppress the differential

mode switching noise to meet CISPR15 requirements.

No specic components were added to suppress currents

of common mode nature. Common mode current can be

controlled in many ways to satisfy CISPR 15 requirements.

The board is tted with a number of optional circuits; a

schematic of a simplied driver is given as well. The circuits

featured are output current soft start and protections from

line overvoltage, load overvoltage and open circuit. The

driver is inherently short circuit proof by virtue of the peak

current regulation method.

Board Layout and Connections

LED Driver Demoboard

Input 120VAC // Output 350mA, 40V (14W)

Specications

Input voltage: 100V

RMS

to 135V

RMS

, 60Hz

Output voltage: 0 to 40V

Output current: 350mA +/-5%

Output power: 14W, Max

Power factor 98%

Total harmonic distortion EN61000-3-2 Class C

EMI limits CISPR 15 (see text)

Efciency 83%

Output current ripple 30%

Input overvoltage

protection

140V

RMS

, Latching

Output overvoltage

protection

43V, Latching

Switching frequency 73kHz

Dimensions: 3.5” x 3.0” x 1.25”

General Description

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	HV9931DB1

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