IS31LT3932 Datasheet, PDF (1/12 Pages) Integrated Silicon Solution, Inc – High PF universal LED Driver

IS31LT3932
High PF universal LED Driver
General Description
IS31LT3932 is a universal LED driver, which can
operate in fly-back, buck-boost and buck convertor.
For isolation fly-back, it can achieve high PF, high
current accuracy, ± 5 % load and line regulation and
wide voltage input voltage range, without loop
compensation. For buck convertor, it also can
achieve high PF, high current accuracy, high
efficiency, good load and line regulation and wide
voltage input voltage range, without loop
compensation. with very few components.
IS31LT3932 has special power line sense and output
voltage sense circuits, operates in primary feedback
mode without opto-coupler and achieve stable output
current control without any loop compensation.
Features
Preliminary
 Universal isolation and non-isolation
 Single stage PFC fly-back
 No loop compensation required
 No opto-coupler required
 ± 3 %LED current accuracy
 ± 5 % line regulation and load regulation
 Wide input voltage: 85~265Vac
 Low start-up current(15uA)
 Valley turn-on MOSFET to achieve high
efficiency for buck application
 Few external components
 1A sourcing current and 2A sinking current
 multiple protections
 SOP-8 package
IS31LT3932 has multiple protections to improve the
system reliability, including LED open circuit, LED
short circuit, UVLO, OVP, current sense resistor
short, the primary over current limit and over
temperature protections.
Application
 LED bulb
 LED Tube lamp
 LED PAR
Typical Operating Circuit
Fuse
BD
Vin
D1
C1
R3
R1
C2
R2
R4
TR
C3
R5
D2
U1 3932
VCC
VSINE
GATE
CS
CT
OPT
FB
GND
Q1
Rcs
D3
C6
LED1
R9
LEDn
D5
C4
D4 R8
R6
C5
R7
Figure 1 Typical isolated Operating Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. A, 8/14/2013