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STEVAL-ISA117V1
Wide range isolated flyback demonstration board, single output
12 V/4.2 W based on the VIPER16LN
Data brief
Description
This board implements a 4 W single-output wide
range mains power supply set in flyback isolated
topology, using the VIPER16LN, an off-line high
voltage converter by STMicroelectronics.
STEVAL-ISA117V1
GIPD1712121716FSR
Features






Universal input mains range:

input voltage 90 - 264 VAC

frequency 45 - 65 Hz
Single output voltage: 12 V at 0.35 A
continuous operation
Stand-by mains consumption: < 30 mW at
230 VAC
Average efficiency: > 75 %
Fully protected against faults (overload,
feedback disconnection and overheating)
EMI: according to EN55022-Class-B
May 2013
The features include an 800 V avalanche rugged
power section, PWM operation at 60 kHz with
frequency jittering for lower EMI, current limiting
with adjustable set point, on-board soft-start, a
safe auto-restart after a fault condition and a low
stand-by power.
The device does not require a biasing circuit to
operate because the IC can be supplied by an
internal current generator, therefore saving the
cost of the transformers auxiliary winding. If the
device is biased through an auxiliary winding, the
demonstration board can reach very low standby
consumption (< 30 mW at 230 VAC, with output
load disconnected).
The IC implements several protections that
considerably increase end-product safety and
reliability: thermal shutdown with hysteresis,
delayed overload protection, open loop failure
protection (the last one available only if the
device is biased through the auxiliary winding).
DocID024074 Rev 1
This is information on a product in full production.
1/13
www.st.com
Contents
STEVAL-ISA117V1
Contents
1
Adapter features .............................................................................. 3
2
BOM and schematic ........................................................................ 4
3
Layout .............................................................................................. 6
4
5
Transformer ..................................................................................... 7
Electrical performances .................................................................. 9
6
Revision history ............................................................................ 12
2/13
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STEVAL-ISA117V1
1
Adapter features
Adapter features
The electrical specifications of the demonstration board are listed below:
Table 1: Electrical specification
Parameter
Symbol
Value
Input voltage range
VIN
[90VAC; 265VAC]
Output voltage
VOUT
12V
Max output current
IOUT
0.35A
Precision of output regulation
ΔVOUT_LF
±5%
High frequency output voltage ripple
ΔVOUT_HF
50mV
Max. ambient operating temperature
TAMB
60 ºC
DocID024074 Rev 1
3/13
BOM and schematic
2
STEVAL-ISA117V1
BOM and schematic
Table 2: Bill of material
4/13
Reference
Part
Description
Manufacturer
D0
DF06M
Diode bridge
VISHAY
C1, C2
4.7μF, 400V
Electrolytic capacitor, NHG series
PANASONIC
C3
Not mounted
C4
10μF, 35V
Electrolytic capacitor, GA series
PANASONIC
C5
100nF, 50V
Ceramic capacitor, SR series
AVX
C8
3.3nF, 100V
Ceramic capacitor
C9
470μF, 25V
Ultra-low ESR electrol. Cap., ZL serie
C10
Not mounted
Electrolytic capacitor
C11
33nF, 50V
Ceramic capacitor B3798x serie
EPCOS
C12
2.2nF
Y1 capacitor 440L serie
VISHAY
C13
100nF, 50V
Ceramic capacitor, SR serie
AVX
D1
Not mounted
Clamp diode
D2
STPS2H100
Output diode 2A, 100V
STMicroelectronics
D3
BAT46
Small signal diode
STMicroelectronics
Dz
18V
Zener diode
Rz
6.8kΩ
1/4W resistor
R1
4.7Ω
1W resistor
R4
Not mounted
1/4W resistor
R5
Not mounted
1/2W resistor
R8
8.2kΩ
1/4 W resistor
R9
15kΩ
1/4 W resistor
R10
680kΩ
1/4W resistor
R11a
120kΩ
1/4W resistor
R11b
27kΩ
1/4W resistor
R12a
15kΩ
1/4W resistor
R12b
1.8kΩ
1/4W resistor
IC1
VIPER16LN
PWM controller
STMicroelectronics
IC2
TS431
Voltage reference
STMicroelectronics
IC3
PC817
Optocoupler
L1
1mH
Filter inductor BC type
L2
Short-circuit
L3
1µH
Small signal inductor
DocID024074 Rev 1
Rubycon
TYCO Electronics
EPCOS
STEVAL-ISA117V1
BOM and schematic
Reference
Part
Description
Manufacturer
T1
1335.0062
Transformer
MAGNETICA
J
Jumper
R12b
R10
IC2
2
GND
R4
LIM
C8
COMP
CONTROL
AC IN
AC IN
-
R1
D0
+
C1
+
L1
C2
+
Rz
Dz
C4
+
C5
J
FB
L3
VDD
IC1
D3
R5
DRAIN
D1
C3
4
1
5
T1
C12
8
D2
7
+
C9
R8
IC3
L2
R9
C10
+
C13
C11
R11a
R11b
R12a
-
Vout
Figure 1: Application schematic
GIPD131212 1123FSR
DocID024074 Rev 1
5/13
Layout
3
STEVAL-ISA117V1
Layout
Figure 2: Board layout
GIPD1312121146FSR
6/13
DocID024074 Rev 1
STEVAL-ISA117V1
4
Transformer
Transformer
The transformer characteristics are listed in the table below.
Table 3: Transformer characteristics
Parameter
Value
Test conditions
Manufacturer
MAGNETICA
Part number
1335.0062
Primary inductance
1.2mH ±15%
Measured at 1kHz 0.1V
Leakage inductance
2.9%
Measured at 10kHz 0.1V
Primary to secondary turn ratio (4 - 5)/(7, 8)
7.85 ±5%
Measured at 10kHz 0.1V
Primary to auxiliary turn ratio (4 - 5)/(1 - 2)
7.33 ±5%
Measured at 10kHz 0.1V
The following figures show size and pins distances (mm) of the transformers.
Figure 3: Transformers pins distances
GIPD1312121647FSR
DocID024074 Rev 1
Figure 4: Transformer electrical diagram
GIPD1312121654FSR
7/13
Transformer
STEVAL-ISA117V1
Figure 5: Transformer side view
Figure 6: Transformer size and pin diagram
GIPD1312121806FSR
8/13
DocID024074 Rev 1
GIPD1312121810FSR
STEVAL-ISA117V1
Electrical performances
Figure 7: Standby consumption at no/light
load: IC externally biased (J selected)
Figure 8: Standby consumption at no/light
load: IC self biased (J not selected)
250
350
0
200
300
25mW
250
PIN [mW]
PIN [mW]
50mW
150
100
200
150
0
100
50
25mW
50
50mW
0
0
80
105
130
155
180
205
230
80
255
105
130
VIN [VAC]
155
180 205
VIN [VAC]
GIPD1412121346FSR
230
255
GIPD1412121422FSR
Figure 9: Line regulation
Figure 10: Load regulation
12.3
12.3
12.2
12.2
0
25%
50%
12.1
75%
V OUT [V]
Vout[V]
5
Electrical performances
90
115
12.1
230
100%
265
12
12
11.9
11.9
105
130
155
180
205
230
255
0
0.05
0.1
0.15
0.2 0.25
0.3
0.35
0.4
IOUT [A]
Vin[V]
GIPD1412121446FSR
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GIPD1412121459FSR
9/13
Electrical performances
STEVAL-ISA117V1
Figure 12: Efficiency @ PIN= 1W, IC self
biased
80
80
75
75
70
70
65
65
eff [%]
eff [%]
Figure 11: Efficiency @ PIN= 1W, IC externally
biased
60
60
55
55
50
50
45
45
40
40
80
110
140
170
200
VIN [VAC]
230
260
80
110
140
170
200
VIN [VAC]
GIPD1412121516FSR
230
260
GIPD1412121518FSR
Figure 13: PIN @ POUT = 0.25W, IC externally
biased
Figure 14: PIN @ POUT = 0.25W, IC self
biased
0.5
0.8
0.75
0.45
0.4
P IN [W]
PIN [W]
0.7
0.65
0.35
0.6
0.55
0.5
0.3
0.45
0.4
0.25
80
110
140
170
200
VIN [VAC]
230
260
GIPD1412121521FSR
10/13
DocID024074 Rev 1
80
110
140
170
200
V IN [V AC]
230
260
GIPD1412121528FSR
STEVAL-ISA117V1
Electrical performances
Figure 15: Active mode efficiency and comparison with energy efficiency standards (IC
externally biased)
81
79
77
eff [%]
75
73
DOE limit
71
69
67
CoC 4 limit
115
230
av @ 115 Vac
av @ 230 Vac
65
0.4
0.6
0.8
Iout [% IOUT ]
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GIPD1412121535FSR
11/13
Revision history
6
STEVAL-ISA117V1
Revision history
Table 4: Document revision history
12/13
Date
Revision
Changes
21-May-2013
1
First release.
DocID024074 Rev 1
STEVAL-ISA117V1
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