ST AN2426 APPLICATION NOTE

1 Introduction

This document describes the reference design of the 25W Switch Mode Power Supply
which is dedicated to industrial or white goods applications. The board accepts wide range
input voltages (90 to 265Vrms) and delivers 2 or 3 output voltages depending on the
version. Two types of power supply are availabl e: negativ e output or positive output voltage.
The actual version depends the way the components are assembled on the secondary side
and on the configuration of jumpers. On the primary side, the PCB and transformer are the
same for both versions. More information is available in Chapter 3. The Switch mode power
supply is based on the VIPer53E. The VIPer53E combines in the same package an
enhanced current mode PWM controller with a high voltage MDMesh Power Mosfet. High
efficiency and low standby consumption are the main characteristics of this board. Such
features, coupled with minimal part requirements and global low cost in addition to, makes it
an ideal solution for powering industrial or consumer equipment, meeting worldwide
standards.

AN2426

Applica t ion note

Auxiliary power supply with

VIPer53EDIP

Figure 1. STEVAL-ISA023V1 demo board, described in this application note

January 2007 Rev 1 1/45

www.st.com

Contents AN2426 - Application note

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Main characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Cross regulation and stand by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Functional checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1 Stand by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Short-circuit tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.3 Start-up behavior at full load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.4 Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.5 Power down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.6 Overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.7 Output ripple voltage at full load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6 Conducted noise measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7 Part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

8 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9 Transformer specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.1 Electrical characteristics: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.2 Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

2/45

AN2426 - Application note List of tables

List of tables

Table 1. Output voltages , positive version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. Output voltages , negative version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Output voltages at V
Table 4. Output voltages at V
Table 5. Output voltages at V
Table 6. Output voltages at V
Table 7. Output voltages at V
Table 8. Output voltages at V
Table 9. Output voltages at V
Table 10. Output voltages at V

Table 11. Output voltages with open feedback loop - positive version of power supply . . . . . . . . . . . 29

Table 12. Output voltages with open feedback loop - negative version of power supply . . . . . . . . . . 29

Table 13. Bill of material (Part 1 of 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 14. Bill of material (Part 2 of 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 15. Bill of material (Part 3 of 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 16. Winding characteristics of transformer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 17. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

90VAC, 12V / 0.8A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

IN

230V A C, 12V / 0 .8A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

IN

90VAC, 5V / 3A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IN

230VAC, 5V / 3A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IN

90VAC, –12V / 0.8A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IN

230VAC, –12V / 0.8A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IN

90VAC, –5V / 3A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

IN

230V A C, –5V / 3 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

IN

3/45

List of figures AN2426 - Application note

List of figures

Figure 1. STEVAL-ISA023V1 demo board, described in this application note . . . . . . . . . . . . . . . . . . 1

Figure 2. Electrical diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3. Drain voltage and current at V
Figure 4. Drain voltage and current at V
Figure 5. Drain voltage and current at V
Figure 6. Diodes voltages at V
Figure 7. Drain-source and V
Figure 8. Drain-source and V

= 265VAC - 50Hz and full load. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

IN

voltage and current at VIN = 90VAC - 50Hz and full load . . . . . . . 12

DD

voltage and current at VIN = 265VAC - 50Hz and full load . . . . . . 12

DD

Figure 9. Power consumption during stand by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 10. Device voltages in stand by operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 11. Short circuit on 5V at V
Figure 12. Short circuit on 5V at V
Figure 13. Short circuit on 5V at V
Figure 14. Short circuit on 12V at V
Figure 15. Short circuit on 12V at V
Figure 16. Short circuit on 12V at V

= 90VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

IN

= 230VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

IN

= 265VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

IN

IN
IN
IN

Figure 17. Start-up, positive version of power supply at V
Figure 18. Start-up, positive version of power supply at V
Figure 19. Start-up, negative version of power supply at V
Figure 20. Start-up, negative version of power supply at V
Figure 21. Wake-up time, positive version of power supply at V
Figure 22. Wake-up time, positive version of power supply at V
Figure 23. Wake-up time, negative version of power supply at V
Figure 24. Wake-up time, negative version of power supply at V
Figure 25. Power down, positive version of power supply at V
Figure 26. Power down, positive version of power supply at V
Figure 27. Power down, negative version of power supply at V
Figure 28. Power down, negative version of power supply at V

Figure 29. Ripple voltage at switching frequency, positive version of power supply . . . . . . . . . . . . . . 30

Figure 30. Ripple voltage at switching frequency, negative version of power supply . . . . . . . . . . . . . 30

Figure 31. Conducted noise measurements Phase A - positive version of power supply,

peak detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 32. Conducted noise measurements Phase B - positive version of power supply,

peak detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 33. Conducted noise measurements Phase A - positive version of power supply,

AVG detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 34. Conducted noise measurements Phase B - positive version of power supply,

AVG detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 35. Conducted noise measurements Phase A - negative version of powe r supply,

peak detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 36. Conducted noise measurements Phase B - negative version of powe r supply,

peak detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 37. Conducted noise measurements Phase A - negative version of powe r supply,

AVG detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 38. Conducted noise measurements Phase B - negative version of powe r supply,

AVG detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 39. Silk screen - top side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 40. Silk screen - bottom side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

= 90VAC - 50Hz and full load . . . . . . . . . . . . . . . . . . . . . . 9

IN

= 230VAC - 50Hz and full load . . . . . . . . . . . . . . . . . . . . 10

IN

= 265VAC - 50Hz and full load . . . . . . . . . . . . . . . . . . . . 10

IN

= 90VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

= 230VAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

= 265VAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

= 90VAC . . . . . . . . . . . . . . . . . . . . . . . . 21

IN

= 230V AC . . . . . . . . . . . . . . . . . . . . . . . 22

IN

= 90VAC. . . . . . . . . . . . . . . . . . . . . . . . 22

IN

= 230V AC. . . . . . . . . . . . . . . . . . . . . . . 2 3

IN

= 90VAC. . . . . . . . . . . . . . . . . . . . 24

IN

= 230VA C . . . . . . . . . . . . . . . . . . 24

IN

= 90VAC . . . . . . . . . . . . . . . . . . . 25

IN

= 230VAC . . . . . . . . . . . . . . . . . . 25

IN

= 90VAC. . . . . . . . . . . . . . . . . . . . . 26

IN

= 230VAC . . . . . . . . . . . . . . . . . . . 27

IN

= 90VAC . . . . . . . . . . . . . . . . . . . . 27

IN

= 230VAC . . . . . . . . . . . . . . . . . . . 28

IN

4/45

AN2426 - Application note List of figures

Figure 41. Copper tracks - bottom side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 42. Transformer layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 43. Dimension and appearance of transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 44. Winding position of transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5/45

Main characteristics AN2426 - Application note

2 Main characteristics

The main characteristics of the SMPS are listed below:

● Input voltage: Vin: 90-265Vrms

● Frequency 45-66Hz

● Output voltages are given in Table 1, and 2:

● Standby consumption: <1 Watt

● Short circuit protection: on all outputs with auto-restart at short removal

● EMI according to:EN55022 Class B.

Table 1. Output voltages, positive version

V

OUT

I

OUT

3.3V 100mA 330mW 2%
5V 3A 15W 5%

12V 0.8A 9.6W 15%

P

= 24.93W

OUT

Table 2. Output voltages, negative version

V

OUT

I

OUT

–5V 3A 15W 5%

–12V 0.8A 9.6W 15%

P

= 24.6W

OUT

P

P

MAX

MAX

Stability

Stability

6/45

AN2426 - Application note Main characteristics

Figure 2. Electrical diagram

CON1

221

100nF/275VAC/X2

100nF/275VAC/X2

R21M

R35.6k

2

6

OSC

V

DD

D

C7

22µF/35V

D2 STPS1150

R5

C8120pF

D3
BAR18

5

1

U1
7

5

15R

F12A

C1

L1
20mH/L11A

C2

-+-+
D1

C368µF/400V

VIPer 53DIP

Q1

BC807-40

D4

STTH1R06

3

4

R11M

D5

RT1

t

1.5KE150A

1
T1

C16

2.2nF/Y1

4.7nF/50V

150nF

39nF

C6

5.1k

Input 85 - 265VAC

C4

NC

C5

8

TOVL

1

COMP

4

R4

S
S

3

7.5k

U2

U2
PC817

R14

1k

470µF/25V

0.1µH

R10
10k

C12
100nF

+

33µF/35V

9.1V

C17

CON2CON2

10

98

D8
STPS2H100

C9

L3

+

C14

D9

Positive version only

Negative version only

AI12637

7

6

3.3µH

470µF/25V

L78L33

D6

0R

L2

STPS1045D

D7

C10

+

1000µF/25V

+

+

C11

1000µF/25V

R7
220R

R9

U3
TL431

R12

R12
15k

+

3

1

C

100nF

C15

120R

U4

V
GND

V

OUT

4

+

R6
220R

R8

0R

R11

R11
15k

+

R13

IN

C18 100n

0

470n

123

43

12

STPS1045D

7/45

Circuit description AN2426 - Application note

3 Circuit description

The converter topology of this SMPS is the fly-back, working in continuous and
discontinuous conduction mode. The core of this design is the primary controller
VIPer53EDIP, integrating the controller and a Power Mosfet in a single, standard DIP-8
package. The device integrates all the functions needed to control and protect a power
supply , giving a modern, compact and cheap solution to SMPS designs. If an SMT mounting
is required, a PowerSO-10 version is also available (VIPer53ESP).

The operating frequency of the circuit (~60kHz) has been chosen in order to obtain a
compromise between the transformer size and the input filter complexity. Frequency
modulation has been implemented on the input of VIPer53E to reduce electromagnetic
interferences on the SMPS. Thus, the EMI input filter can be a simple LC-filter consists of
CMC and two X2 capacitors, for differential and common mode noise. The input of SMPS is
protected against inrush peak current by an NTC. In case any catastrophic failures a
standard 5 x 20mm fuse disconnects the SMPS from mains. The transformer reflected
voltage is ~73V, which provides enough room for the leakage inductance voltage spike and
leaves enough margin of reliability. The D4 diode and the D5 transil, clamp the leakage
inductance voltage spike, assuring reliable operation of the Viper53EDIP.

The transformer is manufactured by TDK, and designed according to the safety standard
EN60950. It has two secondary windings, which provide 5 and 12V or –5 and –12V, and an
additional winding which provides the supply voltage for the VIPer53EDIP.

This power supply can generate positive or negative output voltages depending on the
configuration of the jumpers. Jumpers J1, J2, J5 and J7 have to be assembled for the
positive version of the power supply, whilst jumpers J3, J4, J6 and J8 have to be assembled
for the negative version. It is also mandatory to change polarity of the output electrolytic
capacitors: C9, C10, C11, C13 and C14. Diode D6 is found on the secondary side of the
positive power supply, whilst diode D7 is found on the negative side. The polarization of the
diode D8 has to be also changed. The positive power supply can generate a voltage of 3.3V
from the linear regulator U4.

The output rectifiers have been chosen in accordance with the maximum reverse voltage
and their power dissipation. The 5V and –5V rectifier is a Schottky barrier, type
STPS1045D0. It is assembled in an axial TO220 package. The 12V and –12V rectifier is a
Schottky barrier, type STPS2H100. It is assembled in an SMD package. This rectifier has
low forw ard voltage drop, therefore it improves efficiency as it has a lower power dissipation
in comparison with a standard type. A small LC filter has been added on both outputs in
order to filter the high frequency ripple without increasing the output capacitors size or
quality. Output voltage regulation is performed by secondary feedback, which monitors the
5V output. The feedback network is a classical one, which uses a TL431 and optocoupler. I t
assures the required insulation between the primary and secondary sides. The opto­transistor drives the COMP pin of the Viper53EDIP, directly. Capacitor C6 and resistor R4
are parts of the compensation loop filtering the high frequency noise.

The VIPer53EDIP is activated at start-up by an internal current source, charging capacitor
C7 from the DC bus via the Drain pin. As a result of this circuit, the start-up time is short and
independent from the mains voltage input. During normal operation the device is powered
by the transformer via the LEB circuit (Q1, C8, D3 and R5) and the D2 diode. The LEB
circuit filters leakage inductance spikes, i.e. it blanks the spike appearing at the leading
edges of the voltage which are generated by the self-supply winding. These spikes, which
are due to inductance leakage from the transformer, are the major cause of raised V

CC

8/45

AN2426 - Application note Circuit description

voltages at high load. This circuit also helps to keep the max VCC voltage under control if the
transformer has a high leakage inductance across the auxiliary.

The switching frequency is selected by resistor R3 and capacitor C4. Capacitor C5 provides
a delay to the current protection intervention, the so called TOVL function.

Figure 3, Figure 4 and Figure 5 show the drain voltage and current at nominal mains voltage

input during normal operation at full load. Clearly the current peak is below the maximum
current peak defined in the VIPer53 datasheet. The drain voltage rise time is around 120ns.

Figure 3 shows the drain peak voltage at full load and maximum mains voltage input. The

measured voltage of 564V, assures reliable operation of the Viper53 MOSFET with a good
margin of the maximum break down voltage BV

DSS

(620V).

Figure 3. Drain voltage and current at V

Ch1: VPIN5 (Drain) Ch4: IPIN5 (Drain current)

= 90V AC - 50Hz and full load

IN

9/45

Circuit description AN2426 - Application note

Figure 4. Drain voltage and current at VIN = 230VAC - 50Hz and full load

Ch1: VPIN5 (Drain) Ch4: IPIN5 (Drain current)

Figure 5. Drain voltage and current at VIN = 265VAC - 50Hz and full load

Ch1: VPIN5 (Drain) Ch4: IPIN5 (Drain current)

10/45

AN2426 - Application note Circuit description

The Figure 6 shows the maximum PIV of rectifiers. They have been measured during 'worst
case scenario'. The margin, with respect to the maximum voltage sustained by each diode,
assure a safe operating conditions for these devices.

Figure 6. Diodes voltages at VIN = 265VAC - 50Hz and full load

Ch3: +5V Diode: Anode voltage Ch4: +12V Diode: Anode voltage

Signals measured on the VIPer53E are shown in Figure 7 and Figure 8, the most salient
controller IC signals are shown. In both figures, clean waveforms, free of hard spikes and
noise that could affect correct operation of SMPS, are distinguishable.

11/45

Circuit description AN2426 - Application note

Figure 7. Drain-source and VDD voltage and current at VIN = 90VAC - 50Hz and full

load

Ch1: VPIN5 (Drain) Ch2: VPIN1 (Comp) Ch3: VPIN2 (Osc) Ch4: VPIN7 (V

DD

)

Figure 8. Drain-source and VDD voltage and current at VIN = 265V AC - 50Hz and full

load

Ch1: VPIN5 (Drain) Ch2: VPIN1 (Comp) Ch3: VPIN2 (Osc) Ch4: VPIN7 (V

12/45

DD

)

AN2426 - Application note Cross regulation and stand by

4 Cross regulation and stand by

The following tables show the output voltages for both positive and negative version of
power supplies, in addition to the overall efficiency of the converter measured at different
input voltages. All the output voltages have been measured on the output connector. It
should be noted that the 5V output is regulated. The 12V output is influenced by load of 5V
branch. If the 5V voltage branch is not loaded typically the voltage on the 12V branch fall
rapidly down.

Positive version of power supply

Table 3. Output voltages at VIN 90VAC, 12V / 0.8A

3.3V 5V 12V
P

V oltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

OUT

[W]

3.28 0.1 4.95 0.5 11.00 0.8 11.60 15.30 75.80

3.28 0.1 4.95 1.0 11.13 0.8 14.17 18.70 75.70

3.28 0.1 4.94 1.5 11.23 0.8 16.71 22.00 75.90

P

[W]

IN

Efficiency

[%]

3.28 0.1 4.93 2.0 11.31 0.8 19.22 25.50 75.40

3.28 0.1 4.92 2.5 11.39 0.8 21.73 29.00 74.90

3.28 0.1 4.91 3.0 11.47 0.8 24.23 32.50 74.50

Table 4. Output voltages at VIN 230VAC, 12V / 0.8A

3.3V 5V 12V

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

P

[W]

OUT

P

[W]

IN

3.28 0.1 4.95 0.5 10.97 0.8 11.58 15.20 76.20

3.28 0.1 4.95 1.0 11.12 0.8 14.16 18.40 76.90

3.28 0.1 4.94 1.5 11.21 0.8 16.70 21.50 77.60

3.28 0.1 4.93 2.0 11.28 0.8 19.20 24.80 77.40

3.28 0.1 4.92 2.5 11.35 0.8 21.70 27.90 77.70

3.28 0.1 4.91 3.0 11.42 0.8 24.19 31.20 77.50

Efficiency

[%]

13/45

Cross regulation and stand by AN2426 - Application note

Table 5. Output voltages at VIN 90VAC, 5V / 3A

3.3V 5V 12V
P

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

V oltage

[V]

Current

[A]

OUT

[W]

3.28 0.1 4.91 3.0 12.25 0.2 17.50 23.80 73.50

3.28 0.1 4.91 3.0 11.74 0.4 19.75 26.60 74.20

3.28 0.1 4.91 3.0 11.56 0.6 21.98 29.60 74.20

3.28 0.1 4.91 3.0 11.46 0.8 24.21 32.50 74.50

Table 6. Output voltages at VIN 230VAC, 5V / 3A

3.3V 5V 12V
P

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

Voltage

[V]

Current

[A]

[W]

3.28 0.1 4.91 3.0 12.22 0.2 17.49 23.10 75.70

3.28 0.1 4.91 3.0 11.71 0.4 19.73 25.80 76.50

3.28 0.1 4.91 3.0 11.52 0.6 21.96 28.40 77.30

OUT

P
[W]

P

[W]

IN

IN

Efficiency

[%]

Efficiency

[%]

3.28 0.1 4.91 3.0 11.41 0.8 24.17 31.10 77.70

Negative version of power supply

Table 7. Output voltages at VIN 90VAC, –12V / 0.8A

–5V –12V

Voltage [V] Current [A] Voltage [V] Current [A]

P

OUT

[W]

–4.98 0.5 –10.97 0.8 11.30 14.50 77.70
–4.97 1.0 –11.16 0.8 13.90 18.00 77.20
–4.96 1.5 –11.27 0.8 16.40 21.50 76.50
–4.95 2.0 –11.36 0.8 19.00 25.10 75.60
–4.95 2.5 –11.45 0.8 21.50 28.60 75.20
–4.94 3.0 –11.54 0.8 24.00 32.20 74.60

Table 8. Output voltages at VIN 230VAC, –12V / 0.8A

–5V –12V

Voltage [V] Current [A] Voltage [V] Current [A]

P

OUT

[W]

–4.98 0.5 –10.97 0.8 11.30 14.50 77.70
–4.97 1.0 –11.12 0.8 13.90 17.80 77.90

P

[W]

P

[W]

IN

IN

Efficiency

[%]

Efficiency

[%]

–4.96 1.5 –11.24 0.8 16.40 21.00 78.20
–4.95 2.0 –11.33 0.8 19.00 24.30 78.00
–4.94 2.5 –11.41 0.8 21.50 27.40 78.40
–4.93 3.0 –11.48 0.8 24.00 30.70 78.10

14/45