ISSI Flicker-Free IS31LT3935 User Manual
IS31LT3935 Bulb Lighting Evaluation Board Guide
Description
The Flicker-FreeTM IS31LT3935 is a single stage current
mode LED driver optimized for high power factor and
compatibility with all TRIAC dimmers. The PFC architecture
enables excellent power factor over a wide range of operating
line and load conditions, even with the simplest of inductor
based driver topologies, thereby reducing system cost and
size while maximizing efficiency.
The IS31LT3935 LED controller features patent pending
AccuDim™ flicker-free dimming technology that mimics the
characteristics of an incandescent light bulb. It presents a
dynamic impedance to the dimmer and integrates an active
bleed circuit for true dimming performance across all
dimmers.
The device is available in a tiny 10 lead DFN-EP (3mm ×3mm)
package. It operates over the temperature range of -40°C to
+85°C.
Features
● Smooth 0-100% Flicker-free Dimming Range
● Compatibility with all TRIAC Dimmers (Digital, Leading
and Trailing-edge)
● Near unity PFC without External PFC Circuitry
● Spread Spectrum Switching for Reduced EMI
● Low 500μA Quiescent Current
● Protections:
● Soft Start
● Under-voltage, (Over-voltage) Lockout
● Thermal Shutdown
Applications
● Dimmable Retrofit LED Lamps and Luminaries up to 30W
● Industrial and Commercial Lighting
● Offline LED Driver Modules and Bricks
Quick Start
● LED array(12 in series )40Vdc-0.37A
● 220V input TRIAC Dimmer
Absolute Maximum Ratings
●≤ 264VAC power supply
●≤ 47V 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 IS31LT3935 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
connections are completed.
1) Connect the positive terminal of the LEDs to the LED+ of
the DEMO and the negative terminal of the LEDs to the
LED- of the Evaluation Board.
2) Connect the input pin N of the Evaluation Board via the
main power switch to AC power supply N.
3) Connect the input pin L of the Evaluation Board via
TRAIC Dimmer pin L, Another pin of TRAIC Dimmer
Connect to the AC power supply L.
4) Turn on the power supply, Adjust the angle of TRAIC
Dimmer
Ordering Information
PART#
IS31LT3935-DLS2-TR -40 to 125°C
TEMP
RANGE
IC
PACKAGE
DFN-10
(Exposed Pad)
Recommended Equipment
● 85~265VAC/50~60Hz power supply
For pricing, delivery, and ordering information, please contact ISSI at analog_mkt@issi.com
or call +1-408-969-6600
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IS31LT3935 Bulb Lighting Evaluation Board Guide
Figure 1 IS31LT3935 Evaluation Board
Schematic
Note: ISSI Evaluation Board does not include a LED array
OPTION：for open output voltage
protection .
Figure 2 Picture of Evaluation Board
NOTE: Physical dimensions are (L×W×H): 73mm×25mm×23mm
PCB Layout
Figure 3 PCB Layout – Top layer
Figure 4 PCB Layout – Bottom layer
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IS31LT3935 Bulb Lighting Evaluation Board Guide
Bill of Materials
No. Name Description Ref Des. Qty. Mfr P/N
1 FUSE
2 MOV 7D471 PIN7 VR 1
3 Bridge rectifier DB107 DIP4 BD1 1
4 Inductor 3mH 0810
5 Inductor 6mH 0810 L3 1
6 Transformer 450uH PQ2016 TR 1
7 Resistor 5.1kΩ 5% 0805
8 Resistor 510Ω 5% 1W R2 1
9 Resistor 200kΩ 1% 1206 R6 1
10 Resistor 180kΩ 1% 1206 R12 1
11 Resistor 3.0kΩ 1% 0805 R16 1
12 Resistor 270kΩ 1% 1206 R7 1
13 Resistor 200kΩ 1% 1206 R13 1
14 Resistor 5.6kΩ 1% 0805 R17 1
15 Resistor 10Ω 1% 1206
16 Resistor 330kΩ 5% 1206 R8 1
17 Resistor 1.0Ω 5% 0805
18 Resistor 10.0Ω 5% 0805 R15 1
19 Resistor 100Ω 5% 0805 R10 1
20 Resistor 5.6M Ω 5% 0805 R11 1
21 Resistor NC R20,R5,C12,C4,R27 0
22 Resistor 300kΩ 5% 1206 R21,R22 2
23 Resistor 180kΩ 5% 1206 R23,R24 2
24 Resistor 180kΩ 1% 0805 R19 1
25 Resistor 0.16Ω 1% 1206 R18 1
26 Resistor 200Ω 5% 0805 R26 1
27 Resistor 51Ω 5% 0805 R25 1
28 CBB-CAP 68nF 630V pin10 C1 1
29 CBB-CAP 220nF 630V pin15 C5 1
30 E-CAP 470uF 50V 1020 C2,C3 2
31 SMD-CAP 22nF 25V X7R 0805 C6 1
32 SMD-CAP 1uF 25V X7R 0805 C7,C8 2
33 SMD-CAP 10uF 25V X7R 0805 C14 1
34 SMD-CAP 10uF 25V X7R 1206 C9,C10 2
35 SMD-CAP 33PF 25V X7R 0805 C11 1
36 SMD-CAP 1nF 1000V X7R 1206 C13 1
37 Y1-CAP 1nF PIN10 CY 1
38 SMD-DIODE ES2J D1 1
39 SMD-DIODE FR107 D6 1
1A250V Φ3
F1 1
L1，L2
R1，R4，R4.1
R3，R14
R9，R15
2
3
2
1
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IS31LT3935 Bulb Lighting Evaluation Board Guide
40 SMD-DIODE 1N914BWT SOD-523F D2,D4,D5,D7 4
41 SMD-DIODE 1N4148 SOD-80 D10 1
42 SMD-ZENER 9.1V 1% SOD-80 D3 1
43 SMD-ZENER 16V 1% SOD-80 D9 1
44 SMD-ZENER 47V 1% SOD-80 D8 1
45 MOS 4N60C TO-252 Q3 1
46 MOS AP2306 SOT-23 Q2 1
47 MOS BSP125 SOT223 Q1 1
48 Photo-coupler EL357 MSOP-4 U2 1
49 IC IS31LT3935 DFN10 U1 1
50 CBB-CAP 22nF 630V PIN10 CX 1
NOTE：please make sure you Dimmer parameter is suitable you application voltage and
frequency.
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IS31LT3935 Bulb Lighting Evaluation Board Guide
Transformer Design
ELECTRICAL SPECIFCATIONS:
1.Primary inductance(Lp)=450uH@10kHz
2. Primary Leakage Inductance (Lk)< = 20uH @10KHz
3. Electrical Strength = 3KV, 50/60Hz,1Min
MATERIALS:
1. Core:PQ2016(Ferrite Material TDK PC40 or equivalent)
2. Bobin:PQ2016 Primary 6,Secondary:8
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 number
of turns
1 NP1 3 2 17T 2 0.40mm-2-UEW 2 0.02*7.5mm
2 NS 14 9 16T 2 2P*0.20mm-TEX 3 0.02*7.5mm
3 NP2 2 1 16T 1 0.40mm- 2-UEW 3 0.02*7.5mm
number
of plies
diameter
number of
plies
tape
remar
ks
Line Regulation and Efficiency
Input Voltage Input Power THD PF Output Voltage Output Current Efficiency
176Vac/50Hz 15.53 11.8% 0.979 40.4 0.329 85.60%
198Vac/50Hz 17.24 13.8% 0.964 40.8 0.360 85.20%
220Vac/50Hz 18.69 26.0% 0.945 41.2 0.386 85.09%
242Vac/50Hz 19.95 27.3% 0.925 41.5 0.407 84.66%
264Vac/50Hz 21.10 28.5% 0.905 41.8 0.424 84.00%
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