Microchip HV9919B Handleiding

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 2015 Microchip Technology Inc.20005462B-page 1

Features

•Hysteretic control with high-side current sensing

•Wide input-voltage range: 4.5 to 40V

•>90% Efficiency

•Typical ±5% LED current accuracy

•Up to 2.0MHz switching frequency

•Adjustable constant LED current

•Analog or PWM control signal for PWM dimming

•Over-temperature protection

•-40ºC to +125ºC operating temperature range

Applications

•Low-voltage industrial and architectural lighting

•General purpose constant current source

•Signage and decorative LED lighting

•Indicator and emergency lighting

Description

HV9919B is a Pulse-Width Modulation (PWM) control-

ler IC designed to drive high-brightness LEDs using a

buck topology. It operates from an input voltage of 4.5

to 40VDC and employs hysteretic control, with a high-

side current sense resistor, to set the constant output

current.

Set the operating frequency range by selecting the

proper inductor. Operation at high switching frequency

is possible since the hysteretic control maintains accu-

racy even at high frequencies. This permits the use of

small inductors and capacitors, minimizing space and

cost in the overall system.

LED brightness control is achieved with PWM dimming

from an analog or PWM input signal. Unique PWM cir-

cuitry allows true constant color with a high dimming

range. The dimming frequency is programmed using a

single external capacitor.

HV9919B comes in a small, 8-Lead DFN package and

is ideal for industrial and general lighting applications.

Package Type

See Table 2-1for pin information

8-Lead DFN

8

7

6

5

1

2

3

4

CS

VIN

RAMP

ADIM

GATE

GND

VDD

DIM

GND

HV9919B

Hysteretic, Buck, High Brightness LED Driver

with High-Side Current Sensing

Product specificaties