Test Procedure for the 45-W High Density
NCP1339H Evaluation Board
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Yann Vaquette - 6/15/2015
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Board Electrical Schematic
Dc output
voltage
Vout
C5
2 2 0p
R1
100k
C3
82u
400V
LGJ 2G820MELA20
R8
2 .7 k
C 22
33n
T1
R 11
1 50 k
IN
D1
C GR M4 0 0 7
L1
10 mH / 2 A
C2
3 3 0 nF
D6
R SFJ L
R 12
22k
R6
4.7M
C6
1n
B32922D3334K
C9
4 7p
C7
1n
F1
2A / 2 50 V
R 10
1k
IC 3x
Op to Ba s e
D4
MMSD 4 1 4 8
1
14
2
13
3
12
4
11
5
10
6
9
7
D3
MMSD 4 1 4 8
C8
2 .2 n
R7
10M
35V
D9
BAS2 1
35V
Gnd
M2
FD MS8 6 2 55 ET1 50
R 20
470
C4
NC
R 15
10
D8
MMSD 4 1 4 8
C 13
10 0 p
Q1
BC 8 5 7
R 26
1k
R 28
3 6k
IC 5
N C P4 3 0 5A
M1
SPP0 7 N 6 5C 3
8
Gnd
R 25
10k
C 18
100n
R 16
47k
R 21
5 .1 k
1
8
2
7
3
6
4
5
IC 3
OptoD iod e
R 27
1 0k
R 29
1 10 k
C 20
47n
IC 4
N C P4 3 1
C 14
100n
R 17
0 .3 3 R
R 19
2 2k
C1
2 .2 n F
NCP1339 demoboard 19 V / 45 W
Gnd
Ac input
voltage
Yann Vaquette - 6/15/2015
C 17
6 8 0 uF
.
D7
BAS21
C 15
1 0 0u / 3 5V
R 13
N TC
C 12
1n
J2
PL U G1
C 16
6 80 u F
R 24
6 .8 k
C 19
1uF
R 14
1k
C 11
1n
J1
PL U G1
.
IC 2
N C P1 33 9 H
R5
4.7M
D2
C GR M4 0 0 7
.
D5
2 0V
R4
5.6M
2
R 23
39k
R 22
39 k
-
+
IC 1
Z4 GP2 0 6 L
C 21
10n
R3
47
R9
2 .7 k
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ON Semiconductor - Confidential propertyGnd
Gnd
Board Picture
Live parts, lethal voltages
Isolated output
Output voltage is 19 V,
nominal current is 2.4 A
Input voltage from 85 V rms to 265 V rms
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Yann Vaquette - 6/15/2015
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Needed Equipment
 The needed equipements are the following:
 An ac source (85 to 265 V rms, 60 / 50 Hz), needed power is below
100 W
 An input ac watt-meter, up to 100 W
 A dc load absorbing up to 50 V, Vin(max) < 30 V, Iout(max) < 6 A
 Usually, dc electronic load can display dc V and dc A. If not, an
voltmeter and ampmeter will be needed
 If the load does not use local Kelvin sensors, then the output voltage
must be measured at the board level, not at the cable ends.
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Yann Vaquette - 6/15/2015
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Connecting the Board for Testing
Watt-meter
Input power
19 V
Electronic load
Ac source
85 to 265 V rms
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Yann Vaquette - 6/15/2015
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Test n°1: No-load Standby
 Apply the input voltage 115 V rms to J1 connector
 Electronic load is disconnected or set to no load
 Check that output voltage is 19 V (±5%)
 Verify that input power is below 35 mW
 Apply the input voltage to 230 V rms
 Repeat above steps
 Input power must be below 40 mW
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Yann Vaquette - 6/15/2015
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Test n°2: Nominal Power
 Apply the input voltage 115 V rms to J1 connector
 Connect electronic load to J2 connector
 Load is set to 2.4 A
 Check that output voltage is 19 V (±5%)
 Verify that input power is: Pin < 50 W
 Apply the input voltage to 230 V rms
 Repeat above steps
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Yann Vaquette - 6/15/2015
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Test n°3: Maximum Power
 Apply the input voltage 115 V rms to J1 connector
 Connect electronic load to J2 connector
 Load is increased over nominal current (2.4 A)
 At a certain point, Iout(max), Vout collapses and the
converter enters in auto-recovery mode (typical is
3.5 A)
 Maximum output current is: 2.7 A < Iout(max) < 5.1 A
 Apply the input voltage to 265 V rms
 Repeat above steps
 Iout(max) is now typically 5.1 A
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Yann Vaquette - 6/15/2015
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Test n°4: Short-circuit
 Apply the input voltage 115 V rms to J1 connector
 Short-circuit is applied at the output via the electronic
load for instance
 Load is increased over nominal current (2.4 A)
 Vout must collapse and the converter enters in autorecovery mode
 Verify that average input power is below 3 W
 Apply the input voltage to 265 V rms
 Repeat above steps
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Yann Vaquette - 6/15/2015
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