Microchip HV9980 Manual


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2020 Microchip Technology Inc. DS20005915A-page 1
HV9980
Features
Integrated 200V, 25Ω (Typical) MOSFETs
Programmable Output Current of up to 80 mA per
Channel
TTL-Compatible PWM Dimming Inputs
Three-Phase Synchronous Operation
Leading Edge Blanking
Individual Channel Short-Circuit Protection with Skip
Mode
Overtemperature Protection
Applications
LCD Panel Backlighting
DLP RPTV or Projector LED Engine Driver
RGB Decorative Lighting
General LED Lighting
General Description
The HV9980 is a fully integrated 3-channel peak-current
PWM controller for driving buck converters in Constant
Output Current mode. It is optimized for use with a large
array of 20 mA to 80 mA LED strings, where multiple
HV9980 ICs are used, sharing a common clock and a
common reference voltage.
Both the clock and the voltage reference are external to
the HV9980 for improved output current accuracy and
uniform illumination. The output currents are programmed
by controlling peak source current in each of the three
internal 200V, 25Ω switching MOSFETs.
The peak current is detected by monitoring voltage at
external sense resistors connected to RSENSE1-3. The
switching MOSFET is turned off when the corresponding
current sense signal exceeds the reference voltage
applied at REF1-3 (in the case of normal output signal
polarity). The beginning of the next switching cycle is
determined by the external clock signal received at the
CLK input. All three channels operate at a switching
frequency of 1/6 of the external clock frequency and
positioned 120º out-of-phase for the purpose of input and
output ripple current reduction. Each channel is protected
from an output Short-circuit condition. When an
Overcurrent condition is detected in the output switch
(RSENSE1-3), the corresponding channel shuts down for
200 µs. The HV9980 recovers automatically, when the
Short-circuit Overcurrent condition is removed. Each
current sense input (CS1-CS3) is equipped with a leading
edge blanking delay to prevent false triggering of the
current sense comparators due to circuit parasitics.
Overtemperature protection is included to prevent
destructive failures due to overheating. Programmable
slope compensation is available at each CS input. AGND
and PGND1-3 must be tied together on the printed circuit
board (PCB). VDD1-3 must be also connected together on
the PCB.
Package Type
24-lead SOW
(Top view)
See Table 3-1 for pin information.
REF1
VDD1
CLK
PWMD1
AGND
POL
REF2
VDD2
PWMD2
REF3
VDD3
PWMD3
PGND1
CS1
RSENSE1
DRAIN1
PGND2
CS2
RSENSE2
DRAIN2
DRAIN3
RSENSE3
CS3
PGND3
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
3-Channel LED Array Driver IC


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV9980

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