Microchip HV9861A Handleiding

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Features

•Fast Average Current Control

•Programmable Constant Off-Time Switching

•PWM/Linear Dimming Input

•Output Short Circuit Protection with Skip Mode

•Ambient Operating Temperature -40°C to +125°C

•Pin-Compatible with the HV9910B and HV9961

Applications

•DC/DC or AC/DC LED Driver Applications

•LED Back-Light Driver for LCD Displays

•General Purpose Constant Current Source

•LED Signage and Displays

•Architectural and Decorative LED Lighting

•LED Street Lighting

Description

HV9861A is a patented, average-mode, constant-

current control, LED driver IC operating in a constant

off-time mode. Unlike the HV9910B, this control IC

does not produce a peak-to-average error, which

therefore greatly improves the accuracy, line and load

regulation of the LED current without any need for loop

compensation or high-side current sensing. The output

LED current accuracy is ±3%.

The IC is equipped with a current limit comparator for

hiccup-mode output short circuit protection. Internal

over-temperature protection is provided. The internally

regulated voltage (VDD) for the HV9861A is 7.5V.

The IC can be powered from a 15 - 450V supply. A

PWM dimming input is provided that accepts an

external control TTL-compatible signal. The output

current can be programmed by an internal 270mV

reference, or controlled externally through a 0 - 1.5V

dimming input.

HV9861A is pin-to-pin compatible with the HV9910B

and HV9961, and can be used as a drop-in

replacement for many applications to improve the LED

current accuracy and regulation.

Package Types

8-Lead SOIC16-Lead SOIC

VIN

CS

GND

GATE

RT

LD

VDD

PWMD

VIN

NC

NC

CS

GND

NC

NC

GATE

NC

NC

RT

LD

VDD

NC

NC

PWMD

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

2

3

4

8

7

6

5

See Table 2-1 for pin information

HV9861A

LED Driver with Average-Mode Constant Current Control

Product specificaties