LED Driver with Average-Current Mode Constant-Current Control
Features
Fast Average Current Control
Programmable Constant Off-time Switching
Linear Dimming Input
PWM Dimming Input
Output Short-circuit Protection with Skip Mode
–40°C to +125°C Ambient Operating
Temperature
• Pin-compatible with HV9910B
•
•
•
•
•
•
General Description
The HV9961 is an Average-Current mode
constant-current control LED driver IC operating in a
constant Off-time mode. Unlike the HV9910B, this
control IC does not produce a peak-to-average error.
This greatly improves accuracy as well as the line and
load regulations of the LED current without any need
for loop compensation or high-side current sensing. Its
output LED current accuracy is ±3%.
The IC is equipped with a current limit comparator for
Hiccup mode output short-circuit protection.
The HV9961 can be powered from an 8V–450V supply.
It has a PWM dimming input that accepts an external
control TTL-compatible signal. In addition, the output
current can be programmed by an internal 275 mV
reference or controlled externally through a 0V–1.5V
linear dimming input.
The HV9961 is pin-to-pin compatible with HV9910B,
and it can be used as a drop-in replacement for many
applications to improve LED current accuracy and
regulation.
Applications
•
•
•
•
•
•
DC/DC or AC/DC LED Driver Applications
LED Backlight Driver for LCD Displays
General Purpose Constant-current Source
LED Signage and Displays
Architectural and Decorative LED Lighting
LED Street Lighting
Package Types
16-lead SOIC
(Top view)
VIN
1
NC
2
16
NC
15
NC
14
RT
13
LD
12
VDD
11
NC
10
NC
9
PWMD
8-lead SOIC
(Top view)
VIN
1
CS
2
GND
3
GATE
4
8
RT
7
LD
6
VDD
5
PWMD
NC
3
CS
4
GND
5
NC
6
NC
7
GATE
8
See
Table 2-1
for pin information.
2017 Microchip Technology Inc.
DS20005588A-page 1
HV9961
Functional Block Diagram
VIN
Regulator
VDD
UVLO
0.15/0.20V
POR
LD
MIN (V
LD
• 0.185, 0.275V)
GATE
Auto-REF
Average Current
Control Logic
CS
L/E
Blanking
IN
OUT
PWMD
R Q
GND
0.44V
Hiccup
CLK
T
OFF
Timer
Current
Mirror
S Q
HV9961
RT
400µs
i
DS20005588A-page 2
2017 Microchip Technology Inc.
HV9961
Typical Application Circuit
LED
Load
1
VIN
5
PWMD
GATE
4
8V–450V
HV9961
6
VDD
7
LD
CS
2
R
T
GND
3
RT
8
R
CS
Sets
LED
Current
2017 Microchip Technology Inc.
DS20005588A-page 3
HV9961
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
V
IN
to GND ............................................................................................................................................ –0.5V to +470V
V
DD
to GND ............................................................................................................................................................ +12V
CS, LD, PWMD, Gate, RT to GND.................................................................................................... –0.3V to V
DD
+0.3V
Junction Temperature, T
J
.................................................................................................................... –40°C to +150°C
Storage Temperature, T
S
..................................................................................................................... –65°C to +150°C
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