HV9971 Datasheet, PDF (1/2 Pages) Supertex, Inc – Isolated, Constant Current LED Driver

Product
Summary
Sheet
Applications:
►► Low Power Lighting
Fixtures
8-Lead SOIC (LG)
030211
HV9971
Isolated, Constant Current LED Driver
V_IN
R_IN
2
VIN
R_BIAS
PWMD
BIAS
4
1
HV9971
GATE
7
GND
6
VD
3
CS
5
VDD
8
R_D
C_DD
I_O
R_SN
C_SN
R_S
R_DD
Typical Application Circuit
Product Overview:
The HV9971 is a primary-side control IC for driving a discontinuous conduction mode
(DCM) flyback LED driver. The IC is optimized for operation at a constant full-load switching
frequency of 100kHz and the universal input AC voltage range of 80-264VAC. It maintains 3%
variation of the LED current setting, and features tight line and load regulation. The proprietary
primary-side output current control employed in the HV9971 makes the output current setting
insensitive to most component tolerances and parasitics without use of an opto-feedback.
The HV9971 LED driver is fully protected against output open and short circuit conditions and
input under-voltage. It also offers a logic input for dimming the LED light output by means of
pulse-width modulation of the output current.
The HV9971 is ideally suited for driving high-brightness LEDs in low-power lighting fixtures
such as incandescent bulb retrofits.
Features:
Isolated solution
Primary side current sensing
Universal 80-264VAC input
PWM dimming
Benefits:
Complies with UL requirements; easy design
No optocoupler required; reduced circuit cost and size
Versatile, one design for worldwide use
Simple controls to adjust LED brightness
Supertex inc.