Microchip HV9925 Bruksanvisning

Microchip Inte kategoriserad HV9925

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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)

RSENSE

GND

PWMD

VDD

DRAIN

Heat Slug

Programmable Current LED Lamp Driver IC with PWM Dimming

HV9925

DS20005723A-page 2 2019 Microchip Technology Inc.

Functional Block Diagram

GND VDD DRAIN

7.5V

OFF

= 10.5µs

REF

S Q

R Q

Over

Temperature

PWMD

HV9925

RSENSE

BLANK

= 300ns

 2019 Microchip Technology Inc. DS20005723A-page 3

HV9925

Typical Application Circuit

RSENSE

VDD

PWMD

DRAIN

DRAIN DRAIN

GND

CDD

ENABLE

CIN

LED1

LEDN

HV9925

1 2

6 7 8

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	HV9925
Färg på produkten:	Blue, Red
Bredd:	305 mm
Djup:	1020 mm
Höjd:	470 mm
Användarmanual:	Ja
Antal hastigheter:	1
Maximal viktbelastning:	30 kg
Hjul storlek:	- "
Batteritid (max):	- km
Batteri/Batterispänning:	6 V
Inkluderar batteriladdare:	Ja
Batterij capaciteit:	- Ah
Vikt (inklusive batteri):	10570 g
Maximal hastighet (elcykelläge):	4 km/h
Bagagehylla:	Nee
Avstånd per batteriladdning (i pedalassistansläge):	- km