VIPER122
High voltage converter
Features
730 V avalanche rugged power MOSFET
PWM controller
3.3 V reference voltage
Frequency jittering
40 mW no load input power at 230 V
AC
Short-circuit protection
Thermal shutdown
Applications
Auxiliary SMPS for:
– home appliances
– consumer goods
– industrial
– lighting
Datasheet
-
production data
Description
The device is a high performance high voltage converter that combines a 730 V rugged power
MOSFET with PWM control. The device embeds high voltage startup and current sense circuitry, which helps reduce the number of components in a BoM. Frequency jittering spreads the EMI and allows the use of a smaller filter. The burst mode feature provides very low input power consumption at light loads.
Figure 1. VIPER122 block diagram
June 2019
This is information on a product in full production.
DS13008 Rev 1 1/21 www.st.com
7
8
9
10
3
4
1
2
5
6
Contents
Contents
VIPER122
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical power capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical and thermal ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2
Feedback loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2.1
6.2.2
Resistor divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Optocoupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3
Burst mode at light load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4
Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5
VCC clamp protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Basic application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1
SSOP10 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 DS13008 Rev 1
VIPER122
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Pin descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SSOP10 mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DS13008 Rev 1 3/21
21
List of figures
List of figures
VIPER122
Figure 1.
VIPER122 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3.
Rth vs. area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
I
LIM
vs. T
J. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5.
V
REF
vs. T
J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6.
I
CC0
vs. T
J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7.
I
CC1
vs. T
J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8.
R
DS(on)
vs. T
J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9.
V
BVDSS
vs. T
J. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 10.
Non-isolated flyback converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 11.
Primary side flyback converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12.
Isolated flyback converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13.
Buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 14.
Buck-boost converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 15.
SSOP10 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 16.
SSOP10 recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4/21 DS13008 Rev 1
VIPER122
1 Pin settings
Figure 2. Connection diagram
Pin settings
SSOP10
1
2
3
4
5
6-10
Table 1. Pin descriptions
Name
GND
VCC
NC
EA-OUT
EA-IN
DRAIN
Function
Connected to the source of the internal power
MOSFET and controller ground reference.
Supply voltage of the control section. This pin provides the charging current of the external capacitor.
Not connected. The pin must be left floating.
Output of the error amplifier.
Input of the error amplifier.
High voltage drain pin. The built-in high voltage switched start-up bias current is drawn from this pin too. Connect to a PCB copper area to facilitate heat dissipation.
DS13008 Rev 1 5/21
21
Typical power capability
2 Typical power capability
VIPER122
Table 2. Typical power
Adapter
(1)
V
IN
: 230 V
AC
Open frame
(2)
V
IN
: 85 - 265 V
AC
Adapter
(1)
Open frame
(2)
9 W 11 W 5 W 6 W
1. Typical continuous power in non-ventilated enclosed adapter measured at 50 °C ambient temperature.
2. Maximum practical continuous power in an open frame design at 50 °C ambient temperature, with adequate heat-sinking.
6/21 DS13008 Rev 1
VIPER122
3 Electrical and thermal ratings
Electrical and thermal ratings
Symbol
V
DS
I
D
V
EA-IN
V
EA-OUT
V
CC
I
CC
P
TOT
T
J
T
STG
Pin
6-10
6-10
5
4
2
-
-
2
-
Table 3. Absolute maximum rating
Drain-to-source (ground) voltage
Pulse drain current (limited by T
J
= 150 °C)
Input pin voltage
Out pin voltage
Supply voltage
Input current
Parameter
Power dissipation at T
A
< 50 °C
Junction temperature range
Storage temperature
-
-
-40
-55
Min.
-
-
-0.3
-0.3
-0.3
Value
Max.
730
2
4.8
3.5
Self limited
20
1
150
150
Unit
Symbol
R
TH-JC
R
TH-JA
R
TH-JC
R
TH-JA
Table 4. Thermal data
Parameter
Thermal resistance junction to case
(1)
(Dissipated power = 1 W)
Thermal resistance junction ambient
(1)
(Dissipated power = 1 W)
Thermal resistance junction to case
(2)
(Dissipated power = 1 W)
Thermal resistance junction ambient
(2)
(Dissipated power = 1 W)
Max. value
10
155
5
95
1. When mounted on a standard single side FR4 board with minimum copper area.
2. When mounted on a standard single side FR4 board with 100 mm
2
(0.155 sq in) of Cu (35 μm thick).
Unit
°C/W
°C/W
°C/W
°C/W
V
V
V
A
V mA
W
°C
°C
DS13008 Rev 1 7/21
21
Electrical and thermal ratings
Figure 3. Rth vs. area
VIPER122
8/21 DS13008 Rev 1
VIPER122
4 Electrical characteristics
Electrical characteristics
(T
J
= 25 °C, V
CC
= 14 V, unless otherwise specified.)
Symbol
V
BVDSS
R
DS(on)
C
OSS
I
DSS
V
START
I
CH1
I
CH2
V
CC
V
CLAMP
V
ON
V
CCL
V
OFF
I
CC0
I
CC1
I
CC2
I
CC_FAIL
I
LIM
T
ON(MIN)
F
OSC
F
D
F
M
D
MAX
V
REF
I
PULL UP
Parameter
Table 5. Electrical characteristics
Test Condition
Breakdown voltage
OFF state DRAIN leakage current
Drain-source start voltage
I
D
= 1 mA,
EA-OUT = GND
Drain-source ON state resistance
I
D
= 0.2 A; T
J
= 25 °C
Effective (energy related) output capacitance
V
DRAIN
= 100 V
(1)
V
DRAIN
= 730 V
Startup charging current
Charging current during operation
Operating voltage range
V
CC
clamp voltage
V
CC
ON threshold
V
CC
low value
UVLO
Operating supply current, not switching
-
V
DRAIN
= 100 V
V
CC
= 4 V
V
DRAIN
= 100 V
V
CC
= 9 V falling edge
-
I
CC
= 15 mA
-
-
-
Not switching
Operating supply current, switching
Operating supply current, with
V
CC
< V
OFF
Switching
V
CC
= 6 V
VCC clamp protection
Drain current limit (OCP)
Minimum turn ON time
Modulation depth
Modulation frequency
Max. duty cycle
-
E/A reference voltage
EA-IN pin current pull up
V
CC
= V
CLAMP
V
EA-OUT
= 3.3 V
V
EA-OUT
= 3.3 V
-
-
-
-
(1)
-
-
Min.
730
-0.6
-7
11.5
23.5
12
9.5
7
-
-
-
-
-
-
-
4
-
70
3.2
-
0.4
-
54
-
-
-
-
13
10.5
8
-
-
-
-
230
-
3.3
-1
0.45
-
60
±4
Typ.
-
Max.
-
Unit
V
-
12
-
-
-
27
-
70
45
-1.8
Ω pF
μA
V mA
-14
23.5
14
11.5
9
0.7
1.6
mA
0.35
-
-
80
3.4
-
0.5
450
66
mA
V
V
V
V
V mA mA mA
Hz
%
V
μA
A ns kHz kHz
DS13008 Rev 1 9/21
21
Electrical characteristics VIPER122
Symbol
Table 5. Electrical characteristics (continued)
Parameter Test Condition Min.
(1)
G
M
V
EA-SAT
V
EA-BM
V
HYST
R
DYN
H
EA-OUT
E/A Trans conductance
EA-OUT pin saturation limit
Burst mode threshold
Burst mode hysteresis
I
EA-OUT
Dynamic resistance
ΔV
EA-OUT
/ ΔI
D
EA-OUT pin source / sink current
I
EA-OUT_MAX
EA-OUT pin max. source current
T
SD
T
HYST
Thermal shutdown temperature
Thermal shutdown hysteresis
1. Specification assured by characterization.
-
-
-
V
EA-IN
= GND
(1)
-
-
(1)
(1)
1
-
-
-
-
3
-
-
150
-
Typ.
2
3
1.1
40
15
-
150
220
160
30 -
-
-
Max.
1.2
-
-
-
-
6
-
Unit mA/V
V
V mV k
V/A
μA
μA
°C
°C
10/21 DS13008 Rev 1
VIPER122
5 Typical electrical characteristics
Figure 4. I
LIM
vs. T
J
,
/,0
,
/,0
#&
Typical electrical characteristics
Figure 5. V
REF
vs. T
J
9
5()
9
5()
#&
7
-
>&@
Figure 6. I
CC0
vs. T
J
,
&&
,
&&
#&
Figure 7. I
CC1
vs. T
J
,
&&
,
&&
#&
7
-
>&@
Figure 8. R
DS(on)
vs. T
J
5
'6RQ
5
'6RQ
#&
7
-
>&@
Figure 9. V
BVDSS
vs. T
J
9
%9'66
9
%9'66
#&
7
M
&
DS13008 Rev 1
7
M
&
11/21
21
General description
6 General description
VIPER122
The VIPER122 is a 730 V high voltage converter optimized for flyback and buck topologies that operates at 60 kHz switching frequency and integrates jittering in order to reduce EMI levels.
The low IC consumption combined with Burst Mode allows very low input power at no load and very good efficiency at light load.
6.1
6.2
6.2.1
Startup
On initial startup, the integrated high voltage current source charges the VCC capacitor. The charge current I
CH1
is stopped as soon as the VCC voltage reaches V
ON
.
As soon as the VCC capacitor is charged up to the V
ON
threshold, the power MOSFET starts switching in soft-start mode and the device is either supplied from an external source
(auxiliary winding or directly from the output voltage through a diode) or internally from the high voltage startup that is reactivated whenever the VCC voltage drops to the VCCL level.
Soft-start is staggered over 16 steps up to the default current limit value (I
LIM of 8.5 ms.
), over a period
In case of fault detection, the VCC voltage moves between V
ON
(13 V) and V
CCL
(10.5 V) and power MOSFET switching is only interrupted if the VCC voltage falls below the UVLO
(V
OFF
) threshold, which typically occurs if the DRAIN voltage is removed.
Feedback loop
The device operates in current mode, so the primary current is internally sensed and converted into voltage that is applied to the non-inverting pin of the PWM comparator. The sensed voltage is compared through a voltage divider on a cycle-by-cycle basis with the voltage on the EA-IN pin.
The OCP comparator works in parallel with the PWM comparator and limits the primary current below the I
LIM
threshold.
There are two ways to close the loop and regulate the output: through a resistor divider or an optocoupler.
Resistor divider
For non-isolated topologies (flyback, buck or buck-boost converters), the output voltage can be directly regulated by connecting a resistor divider to the EA-IN pin that is the inverting input of the integrated error amplifier (EA).
Primary side regulation can be achieved by connecting the resistor divider from the auxiliary winding of the transformer to the EA-IN pin.
The loop compensation network is connected on the EA-OUT pin.
12/21 DS13008 Rev 1
VIPER122
6.2.2
General description
Optocoupler
For an isolated flyback, the EA-IN pin must be connected to ground and the optocoupler connected to the EA-OUT pin.
The EA-OUT pin dynamics range between the values V
EA-SAT
SAT
level, the primary drain current reaches its limit; below the V enters Burst Mode.
and V
EA-BM
: above the V
EA-
EA-BM
level, the device
6.3 Burst mode at light load
When the load decreases, the feedback loop reacts by lowering the EA-OUT pin voltage. If it falls below the V
EA-BM above V
EA-BM
+ V
HYST
.
threshold, power MOSFET switching is interrupted until it returns
During Burst Mode, the drain current peak is clamped to about 85 mA in order to avoid audible noise due to the low switching frequency.
6.4
6.5
Short-circuit protection
The protection for a short-circuit is only tripped if the event persists for 50 ms If the protection is tripped, the device stops switching for 1 second and then restarts automatically.
VCC clamp protection
A fault condition is detected if both of the following conditions are verified:
1.
The primary drain current reaches the I
LIM
threshold value.
2. The clamp current injected on the VCC pin reaches the I
CC_FAIL
threshold value.
When the protection is tripped, the device stops switching for 1 second and then restarts automatically. The device is protected in case of failure of the feedback network.
DS13008 Rev 1 13/21
21
Basic application schematics
7 Basic application schematics
Figure 10. Non-isolated flyback converter
VIPER122
Figure 11. Primary side flyback converter
14/21 DS13008 Rev 1
VIPER122 Basic application schematics
Figure 12. Isolated flyback converter
Figure 13. Buck converter
DS13008 Rev 1 15/21
21
Basic application schematics
Figure 14. Buck-boost converter
VIPER122
16/21 DS13008 Rev 1
VIPER122
8 Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com
.
ECOPACK ® is an ST trademark.
8.1 SSOP10 package information
,
Figure 15. SSOP10 package outline
%*.& / 4 *0/ 4 */ N N
(" 6 (& 1 -" / &
-
%
$
4 & " 5 */ ( 1 -" / &
" "
"
$
$ 01 -" / " 3 -& " %4
D
C
I Y ¡
& &
DS13008 Rev 1
5 01 7 *& 8
F
1 3 0+ & $ 5 *0/
17/21
21
Package information
Dim
D
E b c
A
A1
A2 h
L
E1 e
K
Table 6. SSOP10 mechanical data mm
Min.
0.10
1.25
0.31
0.17
4.80
5.80
3.80
0.25
0.40
0°
Typ.
4.90
6
3.90
1
Figure 16. SSOP10 recommended footprint
%*.& / 4 *0/ 4 */ N N
VIPER122
Max.
1.75
0.25
0.51
0.25
5
6.20
4
0.50
0.90
8°
3 & $ 0..& / %& % ' 005 1 3 */ 5
Y
18/21 DS13008 Rev 1
VIPER122
9 Ordering information
Order code
VIPER122LSTR
Table 7. Order code
Package
SSOP10
Ordering information
Packaging
Tape & Reel
DS13008 Rev 1 19/21
21
Revision history
10 Revision history
Date
4-Jun-2019
Table 8. Document revision history
Revision Changes
1 Initial release.
VIPER122
20/21 DS13008 Rev 1
VIPER122
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2019 STMicroelectronics – All rights reserved
DS13008 Rev 1 21/21
21
