Használati útmutató Microchip HV9982
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2014 Microchip Technology Inc.DS20005295B-page 1
HV9982
Features
•Switch mode controller for single-switch convert-
ers
•Closed loop control of output current
- Buck
- Boost
- SEPIC
•High PWM dimming ratio
•Internal 40V linear regulator
•Constant frequency operation
•Programmable slope compensation
•Linear and PWM dimming
•+0.2A/-0.4A gate drives for the switching FETs
•Output short circuit protection
•Output over voltage protection
•Hiccup-mode protection
•Analog control of PWM dimming
Applications
•RGB backlight applications
•Multiple string, white-LED driver applications
Description
HV9982 is a three-channel, closed loop, peak-current
mode PWM controller designed to drive a constant out-
put current. It can be used for driving either RGB LEDs
or multiple channels of white LEDs.
HV9982 includes a 40V linear regulator which provides
an 8.0V supply to power the IC. The switching frequen-
cies of the three converters are controlled by an exter-
nal clock signal. The channels operate at a switching
frequency of 1/12th of the external clock frequency and
are positioned 120°out-of-phase to reduce the input
current ripple. Each converter is driven by a peak cur-
rent mode controller with output current feedback.
The three output currents can be individually dimmed
using either linear or PWM dimming. The IC also
includes three disconnect FET drivers, which enable
high PWM-dimming ratios and also help to disconnect
the input in case of an output short-circuit condition.
HV9982 includes a Hiccup-mode protection for both
open LED and short-circuit condition with automatic
recovery when the fault clears.
Three-Channel, Closed-Loop, Switch Mode
LED Drive IC
Termékspecifikációk
| Márka: | Microchip |
| Kategória: | nincs kategorizálva |
| Modell: | HV9982 |
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