Használati útmutató Microchip HV9861A
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2014-2022 Microchip Technology Inc. and its subsidiariesDS20005333B-page 1
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
Termékspecifikációk
| Márka: | Microchip |
| Kategória: | nincs kategorizálva |
| Modell: | HV9861A |
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