IS31LT3932 Bulb Lighting Evaluation Board Guide
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.
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.
LED PAR
Quick Start
Recommended Equipment
●
85~265VAC/50~60Hz power supply
Absolute Maximum Ratings
●≤
265VAC power supply
●≤
39V Vout (Total Vf)
Caution: Do not exceed the conditions listed above,
otherwise the board will be damaged or the output will
be limited
Procedure
The IS31LT3932 DEMO Board is fully assembled and tested.
Follow the steps listed below to verify board operation.
Caution: Do not turn on the power supply until all
Features
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
connections are completed.
1)
Connect the input pin N of the Evaluation Board via the
main power switch to AC power supply N.
2)
3)
Connect the input pin L of the Evaluation L.
Turn on the power supply.
Ordering Information
PART#
IS31LT3932-GRLS2-TR
TEMP
RANGE
-40 to 125°C
IC
PACKAGE
SOP-8
Applications
LED bulb
LED Tube lamp
For pricing, delivery, and ordering information, please contact ISSI at
analog_mkt@issi.com
or call +1-408-969-6600
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 06/08/2013
1
1
IS31LT3932 Bulb Lighting Evaluation Board Guide
Transformer Design
ELECTRICAL SPECIFCATIONS:
1.Primary inductance(Lp)=1.1mH@10kHz
2.
Primary Leakage Inductance (Lk)< = 30uH @10KHz
3. Electrical Strength = 3KV, 50/60Hz,1Min
MATERIALS:
1. Core:EE16(Ferrite Material TDK PC40 or equivalent)
2. Bobin:EE16 Primary
5,Secondary:5
3.. Magnet Wires (Pri) : Type 2-UEW
4. Magnet Wire (Sec) : Triple Insulated Wires
5. Layer Insulation Tape :3M1298 or equivalent.
SCHEMTIC
No
winding
start
end
Wires
Tape
1
2
3
N1
N2
N3
3
10
4
10
1
5
85T
44T
40T
0.18mm-QA
0.35mm-QA
0.18mm-QA
9mm-3
9mm-2
9mm-2
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 06/08/2013
5
5
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