Használati útmutató Microchip HV9931
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2020 Microchip Technology Inc.DS20005733A-page 1
HV9931
Features
•Constant Output Current LED Driver
•Large Step-Down Ratio
•Unity Power Factor
•Low-Input Current Harmonic Distortion
•Fixed-Frequency or Fixed Off-Time Operation
•Internal 450V Linear Regulator
•Input and Output Current Sensing
•Input Current Limit
•Enable Pulse-Width Modulation (PWM) Dimming
and Phase Dimming
Applications
•Offline LED Lamps and Fixtures
•Street Lamps
•Traffic Signals
•Decorative Lighting
General Description
The HV9931 is a fixed-frequency PWM controller IC
designed to control an LED lamp driver using a
single-stage PFC buck-boost-buck topology. It can
achieve a unity power factor and a very high step-down
ratio that enables driving a single high-brightness LED
from 85 VAC to 264 VAC input without a power
transformer. This topology allows reducing the filter
capacitors and using non-electrolytic capacitors to
improve reliability. The HV9931 uses open-loop peak
current control to regulate both input and output
currents. This control technique eliminates the need for
loop compensation, limits the input inrush current, and
is inherently protected from Input Undervoltage
condition.
Capacitive isolation protects the LED Lamp from failure
of the switching MOSFET. The HV9931 provides a
low-frequency PWM dimming input that accepts an
external control signal with a duty ratio of 0% to 100%
and a frequency of up to a few kilohertz. The PWM
dimming capability enables HV9931 phase control
solutions that can work with standard wall dimmers.
Package Type
8-lead SOIC
(Top view)
See Table 2-1 for pin information.
1
2
3
4
8
7
6
5
VIN
CS1
GND
GATE
RT
CS2
VDD
PWMD
Unity Power Factor LED Lamp Driver
Termékspecifikációk
| Márka: | Microchip |
| Kategória: | nincs kategorizálva |
| Modell: | HV9931 |
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