USER GUIDES

Application Note 1854
ISL1903DEMO1Z: Offline Triac Dimmable LED Driver
Introduction
Design Specifications
ISL1903DEMO1Z evaluation board converts a low line AC input
voltage (120V) to a 42V, 350mA constant current output to
drive LEDs. It is implemented with Intersil’s critical conduction
mode (CrCM) single ended buck controller, the ISL1903. It
demonstrates fundamental functions of the ISL1903,
including soft-start, triac dimming, overvoltage protection,
short circuit protection, etc. The circuit operates in CrCM with
variable frequency and allows for near zero-voltage switching
(ZVS). Typical efficiency is about 87% at full load. This
application note covers the test setup, performance data,
dimming data, schematics, layout and BOM.
• Input voltage VIN: 96V to 144V
• Output voltage VO: 28V to 42V
• Output current IO: 350mA (14W)
• Board dimensions: 55×26×15mm3 (L×W×H)
• Input power factor greater than 0.95
• Total harmonic distortion less than 15%
• Peak efficiency at full load: 87%
• 0-100% dimming with leading and trailing edge dimmers
42V, 350mA
LED +
LED Driver with Triac Dimming
10K
0805
R25
LINE
R53
F1
10mH
L2
630V
4700pF, 5%
C9
305V
680nF, 20%
R1e
0O
2512
~
L3
LED Load
50V
270uF, 20%
50V
1uF, 10%
10O
0805
Q2
400V
47nF, 10%
2SK3471
Vdrain
600V, 1A
MB6S
BAV70
70V, 0.2A
D2
NEUTRAL
R27
C19
C3
220uH
2.3:1 (Pri:Aux)
Aux
C1
~
_
R1a
680O
2512
10mH
D4
R11
510K
0805
+
250V
330nF, 10%
RV1
275V, 23J
V275LA4P
D1
200V, 3A
STTH2R02A-T
100O
axial
R8
C1a
C7
120V AC, 60Hz
R9
510K
0805
250V, 2.5A
10K
0805
D1a
R29
R10
10O
0805
R5
R30
D12
LED Q1
21.5K
0603
13V
Zener
T1
400V, 5.4A
TK8P25DA or
STD7NK40ZT4
R12
499O
0603
MCL4448
0.22O
1206
1.58K
0603
50V
10pF, 10%
C18
acp
R1c
DNP
OUT 16
1 VDD
ISL1903DEMO1Z Rev A
R19
R1d
16V
100nF, 10%
4.99K
0603
R52
C12
C13
C6
4 IOUT
GND 13
R1b
21.5K
0603
acp
AC 12
6 OC
OVP 11
7 FB
RAMP 10
8 DELADJ
VERR 9
300K
1206
ISL1903
R20
C4
R16
21.5K
0603
16V
100nF, 10%
100O
0805
DHC 14
5 CS+
510K
0603
100K
0603
3 VREF
Vdrain
R14
NC
NC
2 OFFREF PWMOUT 15
R13
43K
0603
C17
R15
R3
C5
C2
50V
1000pF, 5%
16V
0.47uF, 10%
50V
100pF, 5%
25V
25V
33uF, 20% 33uF, 20%
1.58K
0603
3K
0603
FIGURE 1. AC BUCK CONVERTER APPLICATION SCHEMATIC
ISL1903DEMO1Z Rev A
ISL1903DEMO1Z Rev A
LINE
LINE
LED Driver
Dimmer
LED +
AC LINE
LED
Vout
LOAD
Vin
AC LINE
Vin
LED Driver
LED +
Vout
LED
LOAD
LED -
LED -
NEUTRAL
NEUTRAL
FIGURE 2. TEST SETUP WITH AND WITHOUT DIMMING
June 14, 2013
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1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1854
FIGURE 3. TOP/BOTTOM VIEW OF THE EVALUATION BOARD
Schematic Description
The ISL1903 is a high-performance, critical conduction mode
(CrCM), single-ended buck LED driver controller. It supports
single-stage conversion of the AC mains to a constant current
source with power factor correction (PFC). It also may be used
with DC input converters. The ISL1903 supports buck converter
topologies, such as isolated forward converters or non-isolated
source return buck converters. Operation in CrCM allows near
zero-voltage switching (ZVS) for improved efficiency while
maximizing magnetic core utilization. The ISL1903 LED driver
provides all of the features required for high-performance
dimmable LED ballast designs.
Input EMI Filtering
Inductors L2, L3 and capacitors C7, C9 filter the switching
current to the AC line. Resistors R25, R27 dampen the resonance
of the EMI filter, preventing peaks in the conducted EMI
spectrum.
MOV RV1 clamps the maximum line voltages during line surge
events. Bridge rectifier D1 rectifies the AC line voltage. Fuse F1
provides overload protection from the AC mains.
Start-up Network
R8, R53, R9, Q2 and D2 constitute the linear regulator circuit
which is used during startup. Once the energy is built and voltage
is generated on the aux winding, the linear regulator circuit is
disabled and the auxiliary winding supplies the VDD and current
to the IC.
Power Stage
Q1, D4, T1 (coupled inductor) and C3 are the AC buck converter
components. The source of the main MOSFET Q1 is tied to
ground and a high voltage level shifter is not needed as is the
case in a buck converter.
Near zero voltage switching (ZVS) or quasi-resonant switching, as
it is sometimes referred to, can be achieved in the buck topology
by delaying the next switching cycle after the inductor current
decays to zero (critical conduction mode). The delay allows the
inductance and parasitic capacitance to oscillate, causing the
switching FET drain-source voltage to ring down to minima. If the
FET is turned on at this minima, the capacitive switching losses
2
1
--- CV  are greatly reduced.
2

2
Inductance Calculation
TABLE 1. BUCK CONVERTER ELECTRICAL PARAMETERS
NAME
VALUE
VINmin(rms)
96V
VINmax(rms)
144V
VOUT
42V
IOUT
350mA
Fmin(avg)
90kHz
Inductance value is important in operating the buck converter in
critical conduction mode. The desired inductance is calculated
using Equation 1:
V OUT  V IN  rms  – V OUT 
L = ------------------------------------------------------------------------------------2  f min  I OUT  V IN  rms   2
(EQ. 1)
H
where VOUT is the LED string voltage, VIN is the rms input voltage,
IOUT is the current through the LED string and fmin is the chosen
minimum frequency at minimum VIN. Plugging in the values
from Table 1 into Equation 1 provides:
42  96 – 42 
L = ---------------------------------------------------------------- H = 265H
2  90k  0.35  96  2
(EQ. 2)
The above equation calculates the required inductance when
operating at the DC equivalent input voltage. It does not take into
account the reduction in conduction angle that occurs when the
instantaneous input voltage is less the output voltage.
Equation 3 corrects for this.
 V OUT 
 – 2  arc sin  -----------------------
 V IN  2
L buck = L  -----------------------------------------------------------------
H
(EQ. 3)
42
 – 2  asin  --------------------
 96  2
L buck = 265H  --------------------------------------------------------- = 239H

220µH inductor is selected for this application.
The auxiliary winding is used to detect inductor zero-current for
critical conduction mode operation. R29, R12 and D12 scale
down the sensed zero crossing voltage and applied to the IC.
Deladj sets delay before a new switching cycles starts. This
adjustment allows the user to delay the next switching cycle until
the switching FET drain-source voltage reaches a minimum value
to allow quasi-ZVS (Zero Voltage Switching) operation. Resistor
R16 to ground programs the delay.
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Application Note 1854
Performance Data
TABLE 2. PERFORMANCE DATA- 14 LED LOAD
TABLE 4. PERFORMANCE DATA - 10 LED LOAD
VIN
(V)
PIN
(W)
VO
(V)
IO
(mA)
PO
(W)
PF
(V/V)
THD
(%)
η
(%)
VIN
(V)
PIN
(W)
VO
(V)
IO
(mA)
PO
(W)
PF
(V/V)
THD
(%)
η
(%)
90
15.79
40.89
332.79
13.61
0.983
16.32
86.20
90
11.44
29.43
332.90
9.8
0.99
9.8
85.61
100
15.61
40.88
331.10
13.54
0.985
13.62
86.72
100
11.40
29.43
332.50
9.78
0.99
9.10
85.81
110
15.55
40.88
330.53
13.51
0.986
11.68
86.92
110
11.42
29.42
332.64
9.79
0.98
8.98
85.68
120
15.58
40.88
330.63
13.52
0.98
10.17
86.77
120
11.46
29.42
333.24
9.8
0.98
9.10
85.54
130
15.60
40.88
331.16
13.54
0.98
9.12
86.76
130
11.52
29.42
334.15
9.83
0.97
9.38
85.35
140
15.67
40.88
332.00
13.57
0.98
8.35
86.60
140
11.61
29.42
335.26
9.86
0.96
9.41
84.97
VIN
(V)
PIN
(W)
VO
(V)
IO
(mA)
PO
(W)
PF
(V/V)
THD
(%)
η
(%)
90
13.67
35.30
333.84
11.79
0.99
12.69
86.24
100
13.59
35.29
332.8
11.75
0.99
10.87
86.42
110
13.58
35.28
332.55
11.73
0.99
9.63
86.39
120
13.59
35.27
332.90
11.74
0.98
8.77
86.40
130
13.64
35.26
333.62
11.77
0.98
8.60
86.24
140
13.75
35.26
334.54
11.8
0.97
8.38
85.80
TABLE 3. PERFORMANCE DATA - 12 LED LOAD
Performance Curves
30
100
25
98
10 LEDs
20
12 LEDs
96
THD (%)
POWER FACTOR (V/V) (%)
14 LEDs
94
15
14 LEDs
10
12 LEDs
92
90
10 LEDs
5
90
100
110
120
130
0
140
90
100
110
LINE VOLTAGE (V)
120
130
140
LINE VOLTAGE (V)
FIGURE 4. POWER FACTOR vs LINE VOLTAGE
FIGURE 5. THD WITH LINE VARIATION
90
336
89
OUTPUT CURRENT (mA)
EFFICIENCY (%)
88
14 LEDs
87
86
85
10 LEDs
12 LEDs
84
83
334
10 LEDs
12 LEDs
332
82
14 LEDs
81
80
90
100
110
120
130
LINE VOLTAGE (V)
FIGURE 6. EFFICIENCY vs LINE VOLTAGE
3
140
33090
100
110
120
130
140
LINE VOLTAGE (V)
FIGURE 7. OUTPUT CURRENT VARIATION WITH LINE
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Application Note 1854
Key Waveforms
WAVEFORMS DEPICTING INPUT VOLTAGE AND CURRENT
INPUT
VOLTAGE
INPUT VOLTAGE AND CURRENT DURING STARTUP
INPUT VOLTAGE
INPUT
CURRENT
INPUT CURRENT
FIGURE 8. INPUT VOLTAGE AND CURRENT WAVEFORMS WITH
NO DIMMER CONNECTED; TRACE 3: INPUT VOLTAGE
(70V/DIV); TRACE 4: INPUT CURRENT (100mA/DIV)
OUTPUT VOLTAGE AND CURRENT DURING STARTUP
OUTPUT VOLTAGE
LED CURRENT
FIGURE 10. OUTPUT VOLTAGE AND CURRENT DURING STARTUP;
TRACE 3: OUTPUT VOLTAGE (8V/DIV); TRACE 4:
OUTPUT CURRENT (100mA/DIV)
4
FIGURE 9. INPUT VOLTAGE AND CURRENT DURING STARTUP;
TRACE 3: INPUT VOLTAGE (70V/DIV); TRACE 4: INPUT
CURRENT (100mA/DIV)
LED CURRENT RIPPLE
OUTPUT VOLTAGE
LED CURRENT
FIGURE 11. OUTPUT VOLTAGE AND CURRENT; TRACE 3: OUTPUT
VOLTAGE (8V/DIV); TRACE 4: OUTPUT CURRENT
(100mA/DIV)
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Application Note 1854
Key Waveforms
(Continued)
ZERO-VOLTAGE SWITCHING
SWITCHING WAVEFORMS
RECTIFIED AC
DRAIN
DRAIN
GATE
GATE
LED CURRENT
FIGURE 12. TRACE 1: DRAIN VOLTAGE (70V/DIV); TRACE 2: GATE
VOLTAGE (9V/DIV); TRACE 3: RECTIFIED AC VOLTAGE
(80V/DIV); TRACE 4: OUTPUT CURRENT (300mA/DIV)
FIGURE 13. TRACE 1: DRAIN VOLTAGE (60V/DIV); TRACE 2: GATE
VOLTAGE (7V/DIV)
Dimming Compatibility
The requirement to provide dimming with low cost, triac based
dimmers introduced trade-offs in the design. Due to lower power
consumption by LED lighting, the input current drawn by the
lamp during triac based dimming is below the holding current of
triac dimmers. This causes the triac to trigger inconsistently and
causes flickering and/or limited dimming range. Large
impedance presented to the line by the LED driver allows
significant ringing to occur due to inrush current charging the
input capacitance when triac turns on. This can cause
undesirable operation as the ringing may cause the triac current
to fall to zero and turn off prematurely.
To overcome these issues, an active dimmer current holding
circuit (DHC pin, R17) and a passive damping circuit (C1a, R1a)
are incorporated into the design. These circuits result in
increased power dissipation and hence reduce electrical
efficiency and overall lamp efficacy. For non-dimming
applications, these circuits can be omitted.
ISL1903EVAL1Z evaluation board has been tested against the
following common dimmers available in the market.
1. Leviton 6602-1W
2. Leviton Truetouch TT106-1
3. Lutron DVCL-153P
TABLE 5. DIMMING DATA
% OF OUTPUT
CURRENT AS
PERCEIVED BY
HUMAN EYE
(%)
CONDUCTION
ANGLE
(%)
OUTPUT
CURRENT
(mA)
% OF OUTPUT
CURRENT
MEASURED
(%)
100
348
100.0
100.0
90
348
100.0
100.0
85.2
348
100.0
100.0
80.62
348
100.0
100.0
64.2
247
70.98
84.25
50.4
158
45.4
67.38
39.12
106
30.46
55.19
32.16
75
21.55
46.42
26.16
46
13.22
36.36
13.44
7.7
2.21
14.87
12
1.6
0.46
6.78
8.4
0
0
0
0
0
0
0
4. Luton CTCL-153P
5. Leviton Decora slide dimmer
6. Lutron Skylar S-600
5
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Application Note 1854
Dimming Curve
400
OUTPUT CURRENT (mA)
350
300
250
200
150
100
50
0
0
10
20
30
40
50
60
70
80
90
100
CONDUCTION ANGLE (%)
FIGURE 14. DIMMING CURVE - LEADING EDGE DIMMER
Dimming Waveforms
WAVEFORM SHOWING LINE VOLTAGE AND CURRENT;
CONDUCTION ANGLE: 85.2%
INPUT VOLTAGE
INPUT
CURRENT
FIGURE 15. TRACE 3: INPUT VOLTAGE (100V/DIV);
TRACE 4: INPUT CURRENT (100mA/DIV)
6
WAVEFORM SHOWING LINE VOLTAGE AND CURRENT;
CONDUCTION ANGLE: 57.2%
INPUT VOLTAGE
INPUT CURRENT
FIGURE 16. TRACE 3: INPUT VOLTAGE (100V/DIV);
TRACE 4: INPUT CURRENT (100mA/DIV)
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Application Note 1854
Dimming Waveforms
(Continued)
WAVEFORM SHOWING LINE VOLTAGE AND CURRENT;
CONDUCTION ANGLE: 34.09%
WAVEFORM SHOWING LINE VOLTAGE AND CURRENT;
CONDUCTION ANGLE: 21.6%
INPUT VOLTAGE
INPUT VOLTAGE
INPUT CURRENT
INPUT CURRENT
FIGURE 17. TRACE 3: INPUT VOLTAGE (100V/DIV);
TRACE 4: INPUT CURRENT (100mA/DIV)
FIGURE 18. TRACE 3: INPUT VOLTAGE (100V/DIV);
TRACE 4: INPUT CURRENT (100mA/DIV)
WAVEFORM SHOWING LINE VOLTAGE AND CURRENT;
CONDUCTION ANGLE: 12.96%
INPUT VOLTAGE
INPUT CURRENT
FIGURE 19. TRACE 3: INPUT VOLTAGE (100V/DIV); TRACE 4: INPUT CURRENT (100mA/DIV)
7
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Application Note 1854
Overvoltage Protection
OVP - NO LOAD CONDITION
OVP - NORMAL OPERATION
VDD
VDD
OVP
OUTPUT CURRENT
OUTPUT CURRENT
OVP
FIGURE 20. TRACE 1: VDD (9V/DIV); TRACE 2: OVP (500mV/DIV);
TRACE 4: LED CURRENT (200mA/DIV)
FIGURE 21. TRACE 1: VDD (9V/DIV); TRACE 2: OVP (500mV/DIV);
TRACE 4: LED CURRENT (80mA/DIV)
Short Circuit Protection
VDD VOLTAGE
OUTPUT VOLTAGE
OUTPUT CURRENT
FIGURE 22. TRACE 1: VDD (8V/DIV); TRACE 3: OUTPUT VOLTAGE
(20V/DIV); TRACE 4: LED CURRENT (800mA/DIV)
8
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Application Note 1854
EMI Results - Cispr 22 Class B
QUASI PEAK
AVERAGE
FIGURE 23. LINE AT 120V, 60Hz
QUASI PEAK
AVERAGE
FIGURE 24. NEUTRAL AT 120V, 60Hz
TABLE 6. QUASI PEAK AND AVERAGE READINGS
CLASS B
FREQUENCY (MHz)
LEVEL (dBµV)
AC LINE
LIMIT
MARGIN
DETECTOR (QP/AVG)
0.175
53.5
Line 1
64.7
-11.2
QP
0.175
52.9
Neutral
64.7
-11.8
QP
0.183
51.8
Neutral
64.3
-12.5
QP
0.185
51.6
Line 1
64.3
-12.7
QP
0.175
39.4
Line 1
54.7
-15.3
AVG
0.175
38.7
Neutral
54.7
-16.0
AVG
0.213
46.9
Neutral
63.1
-16.2
QP
0.183
37.5
Neutral
54.3
-16.8
AVG
0.541
37.5
Line 1
56.0
-18.5
QP
0.185
35.4
Line 1
54.3
-18.9
AVG
0.635
35.7
Line 1
56.0
-20.3
QP
0.541
21.1
Line 1
46.0
-24.9
AVG
0.635
20.8
Line 1
46.0
-25.2
AVG
0.213
24.5
Neutral
53.1
-28.6
AVG
27.809
20.4
Neutral
50.0
-29.6
AVG
27.840
18.7
Line 1
50.0
-31.3
AVG
27.809
28.4
Neutral
60.0
-31.6
QP
27.840
26.9
Line 1
60.0
-33.1
QP
9
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Application Note 1854
Temperature Mapping
The following pictures show the temperature of ISL1903 evaluation board.
Operating conditions: VIN = 120V, TA = +25°C, VOUT = 42V, IOUT = 350mA
FIGURE 25. TOP SIDE TEMPERATURE SNAPSHOT DURING 100%
CONDUCTION AND FULL LOADING
10
FIGURE 26. BOTTOM SIDE TEMPERATURE SNAPSHOT DURING 100%
CONDUCTION AND FULL LOADING
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June 14, 2013
Application Schematic
42V, 350mA
LED +
LED Driver with Triac Dimming
R25
LINE
10K
0805
R53
F1
250V, 2.5A
L2
10mH
11
R1e
0O
2512
~
C9
305V
680nF, 20%
L3
10mH
R1a
680O
2512
~
R27
10K
0805
C3
C19
LED Load
220uH
2.3:1 (Pri:Aux)
50V
270uF, 20%
Aux
C1
50V
1uF, 10%
10O
0805
Q2
400V
47nF, 10%
_
2SK3471
Vdrain
600V, 1A
MB6S
BAV70
70V, 0.2A
D2
NEUTRAL
D4
R11
510K
0805
+
250V
330nF, 10%
RV1
275V, 23J
V275LA4P
D1
200V, 3A
STTH2R02A-T
100O
axial
R8
C1a
C7
630V
4700pF, 5%
120V AC, 60Hz
R9
510K
0805
D1a
R29
R10
R12
R5
499O
0603
MCL4448
0.22O
1206
1.58K
0603
50V
10pF, 10%
C18
acp
R1c
DNP
OUT 16
1 VDD
ISL1903DEMO1Z Rev A
R1d
510K
0603
6 OC
OVP 11
7 FB
RAMP 10
16V
100nF, 10%
C13
C4
16V
100nF, 10%
100O
0805
25V
25V
33uF, 20% 33uF, 20%
GND 13
5 CS+
4.99K
0603
C12
DHC 14
4 IOUT
R19
100K
0603
R52
3 VREF
C6
Vdrain
R14
NC
NC
2 OFFREF PWMOUT 15
R1b
21.5K
0603
acp
AC 12
8 DELADJ
300K
1206
VERR 9
ISL1903
R20
R16
21.5K
0603
R13
43K
0603
C17
R15
R3
C5
C2
50V
1000pF, 5%
16V
0.47uF, 10%
50V
100pF, 5%
1.58K
0603
3K
0603
Application Note 1854
10O
0805
R30
D12
LED Q1
21.5K
0603
13V
Zener
T1
400V, 5.4A
TK8P25DA or
STD7NK40ZT4
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Application Note 1854
Bill of Materials
TABLE 7. BOM FOR ISL1903DEMO1Z REV. A
QTY
REFERENCE DESIGNATOR
TYPE/MOUNT/PACKAGE/VOL/TOL/MAT
Cap, Radial, 47n, 400V, 10%, FILM
MANUFACTURER
C1
1
C1a
Cap, TH, 330n, 250V, 20%, MKT
EPCOS
B32529C3334K000
1
C9
Cap, Radial, 0.033µ, 305V, 20%, MKT
EPCOS
B32921C3333M
1
C2
Cap, SM, 0603, 470n, 16V, 10%, X7R
TDK
C1608X7R1C474K
2
C4, C6
Cap, SM, 0603, 0.1µ, 16V, 10%, X7R
MURATA
GRM39X7R104K016AD
1
C5
Cap, SM, 0603, 1000p, 50V, 5%, C0G
MURATA
GRM1885C1H102JA01D
1
C17
Cap, SM, 0603, 100p, 50V, 5%, C0G
PANASONIC
ECJ-1VC1H101J
1
C18
Cap, SM, 0603, 10p, 50V, 5%, C0G
YAGEO
CC0603JRNP09BN100
2
C12, C13
Cap, SM, 1206, 33µ, 25V, 20%, X5R
TDK
C3216X5R1E336M
1
C7
Cap, RADIAL, 10X4mm, 4700p, 630V, 5%, FILM
KEMET
R76PD1470SE40J
1
C3
Cap, RADIAL, 10x20, 270µ, 50V, 20%, ALUM
PANASONIC EEU-FM1H271
1
C19
Cap, SM, 0805, 1µ, 50V, 10%, X7R
Murata
GRM21BR71H105KA12L
1
D1a
Diode, SM, SOT23, 150mA, 75V, Switching
MICRO COM
BAV70-TP
1
D1
Diode, SMD, $P 4.2X4.9, 600V, 0.5A, Rectifier
MICRO COM
MB6S-TP
1
D2
Diode, SMD, SOD-123, 13V, 500mW, zener
FAIRCHILD
MMSZ5243B
1
D12
Diode, SMD, MICROMELF, 100V, 200mA, Small signal
VISHAY
MCL4448-TR
1
D4
Diode, SM, SMA, 200V, 2A, Fast Recovery
STM
STTH2R02A
1
T1
Coupled Inductor, SM,220µH
Renco
RLIN1000
2
L2, L3
Inductor, Radial, 10mH
Renco
RL-5480-3-10000
1
F1
Fuse, Radial, 250V, 2.5A
Bel Fuse
RST 2.5
1
U1
IC, ISL1903 16Pin, QSOP
INTERSIL
ISL1903FAZ
1
Q1
MOSFET, SM, DPAK, 250V, 7.5A
Toshiba/STM
TK8P25DA/STD7NK40ZT4
2
Q2
MOSFET, SM, SOT89, 500V, 0.5A
Toshiba
2SK3471
1
R1a
Res, SM, 2512, 680, 1%, Thick Film
VISHAY
CRCW2512680RFKEG
1
R1b
Res, SM, 1206, 300k, 1%, Thick Film
YAGEO
RC1206FR-07300KL
1
R1c
Res, SM, 0603, 0, 1%, Thick Film
DNP
DNP
2
R1d, R15
Res, SM, 0603, 100k, 1%, Thick Film
VENKEL
CR0603-10W-1003FT
1
R3
Res, SM, 0603, 3k, 1%, Thick Film
YAGEO
RC0603FR-073KL
1
R5
Res, SM, 1206, 0.22, 1%, Thick Film
PANASONIC
ERJ-8RQFR22V
1
R8, R53
Res, SM, 1206, 510k, 1%, Thick Film
VENKEL
CR1206-4W-5103FT
1
R9
Res, SM, 1206, 200, 1%, Thick Film
Res, TH, 200, 1% - substitution for SM
YAGEO
MFR-25FBF-100R
2
R10, R11
Res, SM, 0805, 10, 1%, Thick Film
VENKEL
CR0805-8W-10R0FT
1
R12
Res, SM, 0603, 1.58k, 1%, Thick Film
VENKEL
CR0603-10W-1581FT
1
R13
Res, SM, 0603, 43k, 1%, Thick Film
VENKEL
C0603-10W-4302FT
1
R14
Res, SM, 0603, 1.2Meg, 1%, Thick Film
PANASONIC
ERJ-3EKF1204V
2
R16, R29
Res, SM, 0603, 21.5k, 1%, Thick Film
VENKEL
CR0603-10W-2152FT
1
R1e
Res, SM, 2512, 0, 1%, Thick Film
VENKEL
CR2512-1W-000T
1
R19
Res, SM, 0603, 510k, 1% ,Thick Film
PANASONIC
ERJ-3EKF5103V
1
R20
Res, SM, 0603, 4.99k, 1%, Thick Film
PANASONIC
ERJ-3EKF4991V
2
R25, R27
Res, SM, 1206, 10k, 1%, Thick Film
VENKEL
CR1206-4W-1002FT
1
R30
Res, SM, 0603, 499, 1%, Thick Film
VENKEL
CR0603-10W-4990FT
1
R52
Res, SM, 0603, 100, 1%, Thick Film
VENKEL CR0603-10W-1000FT
1
RV1
Varistor, Radial, 7mm, 275V, 23J, 1.2kA, TVS
LITTLEFUSE V275LA4P
12
PANASONIC
MANUFACTURER PART #
1
ECQE4473KF
AN1854.0
June 14, 2013
Application Note 1854
Assembly Drawing
FIGURE 27. SILKSCREEN TOP
FIGURE 28. SILKSCREEN BOTTOM
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
13
AN1854.0
June 14, 2013