6 W single output SMPS demonstration board
Features
■ Input voltage range Vin: 90 VRMS to 265
VRMS
■ Output voltage V
■ Max output current Iout: 500 mA
■ Precision of output regulation ∆V
■ High frequency output voltage ripple
∆V
out_LF
: 50 mV
out
: 12 V
out_LF
: ±5%
STEVAL-ISA060V1
based on the VIPER17
Data Brief
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.
STEVAL-ISA060V1
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.
The frequency jittering, that is inside
implemented, helps to meet the standards
regarding electromagnetic disturbance.
February 2009 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-ISA060V1
12V 500m
68kR3R3
68k
C1
X2
C1
X2
J1
CON2
J1
CON2
J2
CON2
J2
CON2
10
R1
1kR1R1
1k
10uF 450
10uF 450
L1
4.7 u
L1
4.7 u
OP
TO
PC81
OP
TO
PC81
BROWN OU
CONT
DRA
IN
SOURCE
CONT
RO
VD
FB
U1
VIPER17H
BROWN OU
CONT
DRA
IN
SOURCE
CONT
RO
VD
FB
U1
VIPER17H
22uF 25V
22uF 25V
C1
15n
C1
15n
C5
N.
C5
N.
D1
BAT46
D1
BAT46
D3
STTH1L06
D3
STTH1L06
C8
1 1.8n
C8
1 1.8n
F1
500mA FUSE
F1
500mA FUSE
D5
P6KE250
D5
P6KE250
J3
JUMPER
J3
JUMPER
D2
1N4148
D2
1N4148
R1
330kR1R1
330k
R1
33kR1R1
33k
1.8n
1.8n
R9
18k 1%
R9
18k 1%
NT
C1
10 Ohm NTC
NT
C1
10 Ohm NTC
R1
220kR1R1
220k
68k 1%R8R8
68k 1%
R4
1600k
R4
1600k
BR
C9
ZL 470uF 25
C9
ZL 470uF 25
C7
33nF
C7
33nF
T1
TR
ANSF
OR
ME
T1
TR
ANSF
OR
ME
1k
VR
TL431
VR
TL431
R2
1600k
R2
1600k
D4
STPS2H100
D4
STPS2H100
T2
C1
YK
47uF 25
C1
YK
47uF 25
C1
10nFC1C1
10nF
22kR5R5
22k
C2
10uF 450V
C2
10uF 450V
1 Circuit schematic
Figure 1. Schematic
1
2
J2
J2
STPS2H100
STPS2H100
D4
D4
T1
T1
D3
D3
5
STTH1L06
STTH1L06
D5
D5
P6KE250
P6KE250
C5
C5
M
M
N.
N.
V
V
C3C310uF 450
C3C310uF 450
A
12V 500m
0
0
HL1
H
C1
C1
4.7 u
4.7 u
L1
C9
C9
7
4 691
CON2
CON2
V
V
47uF 25
47uF 25
YK
YK
V
V
ZL 470uF 25
ZL 470uF 25
8
R8R868k 1%
68k 1%
R9
18k 1%
18k 1%
0
0
F
F
1
1
R6R61k1kR6R61k
3
3
1k
1k
R1
R
R
FC8
F
ME
ME
OR
OR
Y1 1.8n
Y1 1.8n
ANSF
ANSF
TR
TR
C8
2
D1
D1
D2
D2
BAT46
BAT46
1N4148
1N4148
R1R11010R1R110
4
4
R1
220k
220k
12
43
1
1
7
7
TO
TO
OP
OP
PC81
N
N
VIPER17H
VIPER17H
PC81
81
IN
IN
7
DRA
DRA
D
D
VD
VD
U1
U1
L
L
RO
RO
CONT
CONT
T
T
BROWN OU
BROWN OU
5
C1
C1
CONT
CONT
3
R1
15n
15n
SOURCE
SOURCE
FB
FB
4 2
2
2
C1
10nF
10nF
330k
330k
1
1
3
TL431
TL431
VR
VR
2 1
2
33nF
33nF
C6C61.8n
C6C61.8n
R3R368k
2
33k
33k
R1
F
F R9
68k
C7
C7
2/4
4
T2T2T2
C2
C2
10uF 450V
10uF 450V
3
2
1 3
2
1BRBR1
4
BR
1
R4
R4
1600k
1600k
X2
X2
C1
C1
R2
R2
C1
C1
NT
NT
12
1600k
1600k
10 Ohm NTC
10 Ohm NTC
t
t
2
13
J3
J3
JUMPER
JUMPER
F1
F1
500mA FUSE
500mA FUSE
C4C422uF 25V
C4C422uF 25V
R5R522k
22k
2
1
CON2
CON2
J1
J1
STEVAL-ISA060V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
09-Feb-2009 1 Initial release.
3/4
STEVAL-ISA060V1
y
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