Microchip HV9918DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9918DB1

A032913

HV9918DB1

High Current LED Driver Demoboard

Specications

The HV9918DB1 demoboard is a high current LED driver designed

to drive one or two LEDs at 700mA from a 9.0 - 16VDC input. The

demoboard uses Supertex’s HV9918 hysteretic buck LED driver

IC.

The HV9918DB1 includes digital control of PWM dimming, which

allows the user to dim the LEDs using an external, TTL-compatible

square wave source applied between and . In this case, DIM GND

the PWM dimming frequency and duty ratio are set by the external

square wave source.

The demoboard is protected against short circuit and open LED

conditions. It also includes thermal derating of the LED current us-

ing an external NTC resistor to prevent over-heating.

The bottom of the HV9918DB1 is an exposed copper plane (con-

nected to the input ground) which can be connected to a 1” square

heatsink (eg: 374324B00035G from Aavid Thermalloy) to allow

for operation in higher ambient temperatures without tripping the

HV9918’s built-in over temperature protection.

Parameter Value

Input voltage9.0 - 16VDC

Output voltage 2.0 - 7.0V

Output current700mA ± 5%

Line and load regulation< ±2%

Output current ripple 5% (peak to peak)

Full load efciency

(@12.0V input)87%

Open LED protectionYes

Output short circuit protectionYes

Dimensions25.4mm X 29.2mm

General Description

Connection Diagram

Input Connection: Connect the input DC voltage between

VIN GND and terminals.

Output Connection: Connect the LED(s) between LED+

(anode of LED string) and (cathode of LED string) ter-LED-

minals.

PWM Dimming Connection:

1. If no PWM dimming is required, short PWMD and

VDD terminals.

2. If dimming using an external PWM dimming source,

connect the PWM source between the PWMD and

GND terminals.

NTC Thermistor Connection:

1. If no thermal derating is required, the terminal NTC

can be left open.

2. If thermal derating of the LED current is required, the

NTC thermistor can be connected between NTC

and GND terminals as shown.

Connections

Silk Screen

NTC

+

-

Supertex

Product specificaties