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STEVAL-ISA174V1
7 W dual output offline flyback converter for home appliances
using VIPer0P
Data brief
Description
The key feature of this offline converter is ZeroPower Mode (ZPM). It is an idle state during
which the device is totally shut down and the
residual consumption from the mains @ 230 VAC
is kept below 10 mW. The IC enters ZPM by
pulling the OFF pin to SGND for more than 10 ms
and exits ZPM (resuming normal switching) by
pulling the ON pin to SGND for more than 20 µs.
This function can be tested by acting on the
tactile switches connected to the ON and OFF
pins.
Features
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Zero-power input consumption ratified as per
IEC62301 Clause 4.5 (PIN_ZPM < 5 mW @
230 VAC)
Negative output voltage easily set through
the voltage divider
Five-star energy efficiency when operating
with no load (PIN_no_load < 10 mW @ 230 VAC)
Meets ErP Lot 6 Tier 2 requirements for
household and office equipment
Meets European regulation 1275/2008
regarding eco-design requirements for
standby and off-mode electric power
consumption for household and office
equipment
Compliant with the ErP Lot 6 Tier 2
requirements in off-mode
Compliant with the 10% load efficiency and
4-point average active-mode efficiency
targets prescribed by the European CoC ver.
5 Tier 2
Meets IEC55022 Class B conducted EMI
even with reduced EMI filter, thanks to the
frequency jittering feature
VIPer0P 800 V avalanche rugged
technology and its embedded protections
ensure enhanced system reliability
RoHS compliant
November 2015
The negative voltage setup is extremely
simplified thanks to an embedded error amplifier,
whose accurate 1.2 V internal reference (FB pin)
is referred to a separate ground (EAGND pin)
that can drift down to -12.5 V with respect to the
signal ground of the IC (SGND). The negative
output (OUT1) is obtained by just connecting
EAGND to the negative rail and a voltage divider
between FB, EAGND and SGND. The positive
output (OUT2) is obtained from OUT1 through
the turn ratio of the secondary windings of the
transformer.
To achieve extremely low input power
consumption, the IC is biased through a diode
coming from the OUT2, which maintains the VCC
voltage high enough (> 4.5 V) to prevent the
activation of the internal HV current source.
DocID028199 Rev 3
For further information contact your local STMicroelectronics sales
office
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www.st.com
Specifications
1
Specifications
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STEVAL-ISA174V1
Topology: Flyback
Isolation: no
Input power consumption:

Less than 5 mW @ 230 VAC in Zero-Power Mode

Less than 10 mW @ 230 VAC in no-load condition

Less than 400 mW @ 230 VAC with 250 mW load
Input Voltage: 85 - 265 VAC
Output 1: -5 V , 840 mA
Output 2: 7 V, 400 mA
Frequency: 60 kHz with jittering (±7%)
Max amb temp: 60 °C
Automatic restart protections: OLP, VCC clamp, max duty cycle counter, thermal
shutdown
Pulse-skip protection to prevent the flux-runaway
Dimensions: 69.6 mm x 28 mm
DocID028199 Rev 3
IN
2
1
10
R1
MRA4007
D6
MRA4007
D1
R4
3.3k
R3
10k
1mH
L2
DocID028199 Rev 3
1
4
EAGND
2
OFF 18
ON 17
15 0nF
PGND
SGND
C7
Vcc
R5
C6 82k
1nF
Drain
Drain
Drain
Drain
COMP
3
FB
7
8
D5
220pF
OFF
ON
220pF
C9
470uF
16ZLK470M8X16
2
1
ZERO POWER
1
Te connectivity V (RS 680-5129)
2
3
M.3VITE
+7V-400mA
GND
-5V-800mA
C11
100uF 25V
+
C8
470uF 16V ZL
R6
16ZLJ470M8X11.5 TBD
4.7uH
L3
STPS2L60A
TRANSFORMER_WURTH_750314288
IC1
VIPER0P
4
9
D4
STPS1L60A
10
BAT41ZFILM
2 TR1
R2
220k 1/2W
D2
MRA4007
C3
1nF
16
15
14
13
6
5
C4
100pF
C5
10uF
+ C1
C2 +
15uF 450V
1mH
L1
15uF 450V
+
C12
1uF
C10
1uF
M.3VITE
OUT
1
2
3
2
D3
STEVAL-ISA174V1
Schematic diagram
Schematic diagram
Figure 1: STEVAL-ISA174V1 circuit schematic
C17
C16
220pF
0
0
C15
GSPG12082015DI1230
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Revision history
3
STEVAL-ISA174V1
Revision history
Table 1: Document revision history
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Date
Version
Changes
07-Aug-2015
1
Initial release.
10-Aug-2015
2
Added: Section Specifications.
20-Nov-2015
3
Updated title on the cover page.
DocID028199 Rev 3
STEVAL-ISA174V1
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DocID028199 Rev 3
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