Microchip HV9982 Handleiding

Microchip Niet gecategoriseerd 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
HV9982
DS20005295B-page 2  2014 Microchip Technology Inc.
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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
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 2014 Microchip Technology Inc. DS20005295B-page 3
HV9982
Pin Diagram
Typical Application Circuit
40-Lead QFN
VDD3
FLT3
CS3
COMP3
FDBK3
REF3
OVP3
CLK
NS
S2
GND
1
10
11 20
40
30
21
31
VDD1
FLT1
CS1
COMP1
FDBK1
REF1
OVP1
VIN
VDD
EN
GND
COMP2
REF2
OVP2
SKIP
RAMP
PWMD1
PWMD2
PWMD3
S1
GATE1
GND1
FDBK2
CS2
FLT2
GATE2
GND2
VDD2
GND3
GATE3
GATE1
CS1
GND1
FLT1
FDBK1
GATE2
CS
GND2
FLT2
FDBK2
GATE3
CS3
OVP3
FLT3
FDBK3
OVP1
OVP2
GND3
VIN
VDD
VDD1
VDD2
VDD3
PWMD1
PWMD2
PWMD3
REF1
REF2
REF3
EN
CLK
GND
COMP1
COMP2
COMP3
SKIP
S2 RAMPS1
HV9982

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9982

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