IS31LT3932
HIGH PF LOW THD UNIVERSAL LED DRIVER
December 2013
GENERAL DESCRIPTION
FEATURES
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 few external 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.
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.
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: 85Vac~265Vac
Low start-up current (15µA)
Valley turn-on MOSFET to achieve high
efficiency for buck application
Few external components
UVLO,OCP,OVP and OTP protections
SOP-8 package
APPLICATION
LED bulb
LED tube lamp
LED PAR
TYPICAL OPERATING CIRCUIT
Figure 1 Typical isolated Operating Circuit
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/28/2013
1
IS31LT3932
PIN CONFIGURATIONS
Package
Top View
SOP-8
PIN DESCRIPTIONS
Pin
Name
Function
1
VSINE
Power line voltage detection.
2
OPT
Isolation and non-isolation option PIN.
-Floating: fly-back and buck-boost
-Connect to ground: buck sinusoidal.
Time setting through the resistor between PIN and ground.
-Isolation: operation cycle time setting
3
CT
f 50k
VFB
300
0.8V Rct (k)
-Non-isolation: MOSFET turn-off delay time setting when FB
detects zero voltage
Tdelay 15 106 REXT
4
GND
Ground.
5
FB
Fly-back and buck-boost: operation frequency is regulated
through this PIN to compensate output current
Non-isolation: valley turn-on detect PIN, the external MOS turns
on after a short delay when FB detects zero voltage
6
CS
MOSFET switching Current sense Pin.
7
GATE
Driver output to the external Power MOSFET.
8
VCC
Power supply input PIN, at a range of 8V~30V.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/28/2013
2
IS31LT3932
ORDERING INFORMATION
Industrial Range: -40°C to +85°C
Order Part No.
Package
QTY/Reel
IS31LT3932-GRLS2-TR
SOP-8, Lead-free
2500
Copyright © 2013 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 11/28/2013
3
IS31LT3932
ABSOLUTE MAXIMUM RATINGS
VCC,GATE to GND
VSINE, OPT, CT, ISEN, FB to GND
Operating temperature, TA
Storage temperature, TST
Junction temperature, TJMAX
ESD (HBM)
ESD (CDM)
-0.3V ~ 36V
-0.3V ~ 6.0V
-40°C ~ +85°C
-60°C ~ +150°C
150°C
2.5kV
750V
Note:
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VCC=16V, VFB=0V, VSINE=0V, VCS=0V, OPT Floating, RSET=300k, and TA=25°C.
Symbol
Parameter
Condition
Min
Type
Unit
30
V
VCC
Power supply range
VOVP
VCC over voltage threshold
33.5
V
tOVP
OVP reset time
160
ms
VST
Startup voltage
VCC rising
14.5
16.0
17.5
V
Under voltage lockout
VCC falling
6
7
8
V
GATE output clamp voltage
VCC=22V
14
16.5
19
V
IIN
Quiescent current
without switching
750
1000
µA
IST
Startup current
VCC=
