Microchip HV9925 Handleiding
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2019 Microchip Technology Inc.DS20005723A-page 1
HV9925
Features
•Programmable Output Current up to 50 mA
•Pulse-Width Modulation (PWM) Dimming/Enable
•Universal 85 VAC to 264 VAC Operation
•Fixed Off-Time Buck Converter
•Internal 475V Power MOSFET
•Overtemperature Protection with Hysteresis
Applications
•Decorative Lighting
•Low-Power Lighting Fixtures
General Description
The HV9925 is a pulse-width modulated high-efficiency
LED driver control IC with PWM dimming capabilities. It
allows efficient operation of high-brightness LED
strings from voltage sources ranging up to 400 VDC.
The HV9925 includes an internal high-voltage
switching MOSFET controlled with a fixed off-time of
approximately 10.5 µs. The LED string is driven at
constant current, thus providing constant light output
and enhanced reliability. Selecting a current sense
resistor value can externally program the output LED
current of the HV9925.
The peak current control scheme provides good
regulation of the output current throughout the
universal AC line voltage range of 85 VAC to 264 VAC
or DC input voltage of 20V to 400V. The HV9925 is
designed with a built-in thermal shutdown to prevent
excessive power dissipation in the IC.
Package Type
Heat slug (exposed thermal pad) is at ground potential. See Table 3-1 for pin information.
8-lead SOIC
(Top view)
1
2
3
4
8
7
6
5
RSENSE
GND
PWMD
VDD
DRAIN
DRAIN
DRAIN
NC
Heat Slug
EP
Programmable Current LED Lamp Driver IC with PWM Dimming
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | HV9925 |
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