Data Brief
For further information contact your local STMicroelectronics sales office.
February 2009 Rev 1 1/4
4
STEVAL-ISA060V1
6 W single output SMPS demonstration board
based on the VIPER17
Features
■Input voltage range Vin: 90 VRMS to 265
VRMS
■Output voltage Vout: 12 V
■Max output current Iout: 500 mA
■Precision of output regulation ∆Vout_LF: ±5%
■High frequency output voltage ripple
∆Vout_LF: 50 mV
Description
This demonstration board is based on the new
VIPER17 device and implements a standard
single-output isolated flyback converter operating
at fixed frequency that can be 115 kHz or 60 kHz.
The VIPER17 device integrates in the same
package two components: an advanced PWM
controller with built-in BCD6 technology and an
800 V avalanche rugged vertical power MOSFET.
It is very suitable for offline power conversion
operating either with wide range input voltage (85
VAC - 270 VAC) up to 6 W or with single range
input voltage (85 VAC - 132 VAC or 175 VAC - 265
VAC). With European range input voltage (175
VAC - 265 VAC) the device can handle up to 10 W
of output power.
The proposed solution has the advantage of using
few external components compared to a discrete
solution, providing several protections and very
low standby consumption in no-load condition.
The protections present on the device such as
overload and output overvoltage protections,
secondary winding short-circuit protection, hard
transformer saturation and brownout protections
improve the reliability and safety of the design.
The frequency jittering, that is inside
implemented, helps to meet the standards
regarding electromagnetic disturbance.
Moreover internal thermal shutdown and an 800 V
avalanche rugged power MOSFET improve the
robustness of all the system.
If brownout and overvoltage protection are not
necessary, the number of external components is
further reduced.
STEVAL-ISA060V1
www.st.com
Circuit schematic STEVAL-ISA060V1
2/4
1 Circuit schematic
Figure 1. Schematic
12V 500m
12V 500m
A
R3
R3
68k
68k
R3
R3
68k
68k
C1
C1
X2
X2
C1
C1
X2
X2
1
2
J1
J1
CON2
CON2
J1
J1
CON2
CON2
1
2
J2
J2
CON2
CON2
J2
J2
CON2
CON2
R1
R1
10
10
R1
R1
10
10
R1
R1
3
1k
1k
R1
R1
3
1k
1k
C3
C3
10uF 450
10uF 450
V
C3
C3
10uF 450
10uF 450
V
L1
L1
4.7 u
4.7 u
HL1
L1
4.7 u
4.7 u
H
12
43
OP
OP
TO
TO
1
PC81
PC81
7
OP
OP
TO
TO
1
PC81
PC81
7
4 2
81
3
5
7
BROWN OU
BROWN OU
T
CONT
CONT
DRA
DRA
IN
IN
SOURCE
SOURCE
CONT
CONT
RO
RO
L
VD
VD
D
FB
FB
U1
U1
VIPER17H
VIPER17H
N
BROWN OU
BROWN OU
T
CONT
CONT
DRA
DRA
IN
IN
SOURCE
SOURCE
CONT
CONT
RO
RO
L
VD
VD
D
FB
FB
U1
U1
VIPER17H
VIPER17H
N
C4
C4
22uF 25V
22uF 25V
C4
C4
22uF 25V
22uF 25V
C1
C1
1
15n
15n
F
C1
C1
1
15n
15n
F
C5
C5
N.
N.
M
C5
C5
N.
N.
M
D1
D1
BAT46
BAT46
D1
D1
BAT46
BAT46
D3
D3
STTH1L06
STTH1L06
D3
D3
STTH1L06
STTH1L06
C8
C8
Y1 1.8n
1 1.8n
FC8
C8
Y1 1.8n
1 1.8n
F
F1
F1
500mA FUSE
500mA FUSE
F1
F1
500mA FUSE
500mA FUSE
D5
D5
P6KE250
P6KE250
D5
D5
P6KE250
P6KE250
13
2
J3
J3
JUMPER
JUMPER
J3
J3
JUMPER
JUMPER
D2
D2
1N4148
1N4148
D2
D2
1N4148
1N4148
R1
R1
0
330k
330k
R1
R1
0
330k
330k
R1
R1
2
33k
33k
R1
R1
2
33k
33k
C6
C6
1.8n
1.8n
F
C6
C6
1.8n
1.8n
FR9
R9
18k 1%
18k 1%
R9
R9
18k 1%
18k 1%
12
t
NT
NT
C1
C1
10 Ohm NTC
10 Ohm NTC
t
NT
NT
C1
C1
10 Ohm NTC
10 Ohm NTC
R1
R1
4
220k
220k
R1
R1
4
220k
220k
R8
R8
68k 1%
68k 1%
R8
R8
68k 1%
68k 1%
R4
R4
1600k
1600k
R4
R4
1600k
1600k
4
1
3
2
BR
BR
1BR
BR
1C9
C9
ZL 470uF 25
ZL 470uF 25
V
C9
C9
ZL 470uF 25
ZL 470uF 25
V
C7
C7
33nF
33nF
C7
C7
33nF
33nF
5
4 6
9
1
2
8
7
T1
T1
TR
TR
ANSF
ANSF
OR
OR
ME
ME
R
T1
T1
TR
TR
ANSF
ANSF
OR
OR
ME
ME
R
R6
R6
1k
1k
R6
R6
1k
1k
2 1
3
VR
VR
1
TL431
TL431
VR
VR
1
TL431
TL431
R2
R2
1600k
1600k
R2
R2
1600k
1600k
D4
D4
STPS2H100
STPS2H100
D4
D4
STPS2H100
STPS2H100
4
13
2
T2
T2
T2
T2
C1
C1
0
YK
YK
47uF 25
47uF 25
V
C1
C1
0
YK
YK
47uF 25
47uF 25
V
C1
C1
2
10nF
10nF
C1
C1
2
10nF
10nF
R5
R5
22k
22k
R5
R5
22k
22k
C2
C2
10uF 450V
10uF 450V
C2
C2
10uF 450V
10uF 450V
STEVAL-ISA060V1 Revision history
3/4
2 Revision history
Table 1. Document revision history
Date Revision Changes
09-Feb-2009 1 Initial release.
STEVAL-ISA060V1
4/4
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