VIPER12A-E
Low power offline switched-mode power supply primary switcher
Features
■
■
■
■
■
■
■
Fixed 60 kHz switching frequency
9 V to 38 V wide range V
DD
voltage
Current mode control
Auxiliary undervoltage lockout with hysteresis
High voltage start-up current source
Overtemperature, overcurrent and overvoltage
protection with auto-restart
Typical power capability
– European (195 - 265 Vac) 8 W for SO-8,
13 W for DIP-8
– European (85 - 265 Vac) 5 W for SO-8,
8 W for DIP-8
SO-8
DIP-8
Typical applications cover off line power supplies
for battery charger adapters, standby power
supplies for TV or monitors, auxiliary supplies for
motor control, etc.
The internal control circuit offers the following
benefits: Large input voltage range on the V
DD
pin
accommodates changes in auxiliary supply
voltage (This feature is well adapted to battery
charger adapter configurations), automatic burst
mode in low load condition and overvoltage
protection in HICCUP mode.
Description
The VIPER12A combines a dedicated current
mode PWM controller with a high voltage power
MOSFET on the same silicon chip.
Figure 1.
Block diagram
DRAIN
ON/OFF
REGULATOR
60kHz
OSCILLATOR
INTERNAL
SUPPLY
OVERTEMP.
DETECTOR
R1
Q
R2 R3 R4
S
FF
PWM
LATCH
VDD
8/14.5V
_
BLANKING
+
OVERVOLTAGE
LATCH
Q
+
_
0.23 V
+
42V
_
S
R
FF
230
Ω
1 kΩ
FB
SOURCE
December 2010
Doc ID 11977 Rev 2
1/21
www.st.com
21
Contents
VIPER12A-E
Contents
1
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
3
4
5
6
7
8
9
10
11
12
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin connections and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rectangular U-I output characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Wide range of VDD voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Feedback pin principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Startup sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Overvoltage threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
Doc ID 11977 Rev 2
VIPER12A-E
Electrical data
1
1.1
Electrical data
Maximum rating
Stressing the device above the rating listed in the “absolute maximum ratings” table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the Operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 1.
Symbol
V
DS(sw)
V
DS(st)
I
D
V
DD
I
FB
V
ESD
T
J
T
C
T
stg
Absolute maximum rating
Parameter
Switching drain source voltage (T
J
= 25 ... 125 °C)
(1)
Start-up drain source voltage (T
J
= 25 ... 125 °C)
(2)
Continuous drain current
Supply voltage
Feedback current
Electrostatic discharge:
Machine model (R = 0
Ω;
C = 200 pF)
Charged device model
Junction operating temperature
Case operating temperature
Storage temperature
Value
-0.3 ... 730
-0.3 ... 400
Internally limited
0 ... 50
3
200
1.5
Internally limited
-40 to 150
-55 to 150
Unit
V
V
A
V
mA
V
kV
°C
°C
°C
1. This parameter applies when the start-up current source is OFF. This is the case when the V
DD
voltage has
reached V
DDon
and remains above V
DDoff
.
2. This parameter applies when the start up current source is ON. This is the case when the V
DD
voltage has
not yet reached V
DDon
or has fallen below V
DDoff
.
1.2
Thermal data
Table 2.
Symbol
R
thJC
R
thJA
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance ambient-case
(1)
Max
Max
SO-8
25
55
DIP-8
15
45
Unit
°C/W
°C/W
1. When mounted on a standard single-sided FR4 board with 200 mm
2
of Cu (at least 35 µm thick) connected
to all DRAIN pins.
Doc ID 11977 Rev 2
3/21
Electrical characteristics
VIPER12A-E
2
Electrical characteristics
T
J
= 25 °C, V
DD
= 18 V, unless otherwise specified
Table 3.
Symbol
BV
DSS
I
DSS
r
DS(on)
t
f
t
r
C
OSS
Power section
Parameter
Drain-source voltage
OFF State drain
current
Static drain-source
ON state resistance
Fall time
Rise time
Drain capacitance
Test conditions
I
D
= 1 mA; V
FB
= 2 V
V
DS
= 500 V; V
FB
= 2 V;
T
J
= 125 °C
I
D
= 0.2 A I
D
= 0.2 A;
I
D
= 0.2 A I
D
= 0.2 A; T
J
= 100 °C
I
D
= 0.1 A; V
IN
= 300 V
(1)
(See
Figure 9 on page 13)
I
D
= 0.2 A; V
IN
= 300 V
(1)
(See
Figure 9 on page 13)
V
DS
= 25 V
100
50
40
27
Min
730
0.1
30
54
ns
ns
pF
Typ
Max
Unit
V
mA
Ω
1. On clamped inductive load
Table 4.
Symbol
I
DDch
Supply section
Parameter
Start-up charging
current
Start-up charging
current in thermal
shutdown
Operating supply
current not switching
Operating supply
current switching
Restart duty-cycle
V
DD
undervoltage
shutdown threshold
V
DD
start-up
threshold
V
DD
threshold
hysteresis
V
DD
overvoltage
threshold
Test conditions
100 V
≤
V
DS
≤
400 V;
V
DD
= 0 V ...V
DDon
(See
Figure 10 on page 13)
V
DD
= 5 V; V
DS
= 100 V
T
J
> T
SD
- T
HYST
I
FB
= 2 mA
I
FB
= 0.5 mA; I
D
= 50 mA
(1)
(See
Figure 11 on page 13)
(See
Figure 10,
Figure 11 on page 13)
(See
Figure 10,
Figure 11 on page 13))
(See
Figure 10 on page 13)
7
13
5.8
38
0
Min
Typ
-1
Max
Unit
mA
I
DDoff
mA
I
DD0
I
DD1
D
RST
V
DDoff
V
DDon
V
DDhyst
V
DDovp
3
4.5
16
8
14.5
6.5
42
5
mA
mA
%
9
16
7.2
46
V
V
V
V
1. These test conditions obtained with a resistive load are leading to the maximum conduction time of the
device.
4/21
Doc ID 11977 Rev 2
VIPER12A-E
Electrical characteristics
Table 5.
Symbol
F
OSC
Oscillation section
Parameter
Oscillator frequency
total variation
Test conditions
V
DD
= V
DDoff
... 35 V;
T
J
= 0 ... 100 °C
Min
54
Typ
60
Max
66
Unit
kHz
Table 6.
Symbol
G
ID
I
Dlim
I
FBsd
R
FB
t
d
t
b
t
ONmin
PWM comparator section
Parameter
I
FB
to I
D
current gain
Peak current
limitation
I
FB
shutdown current
FB pin input
impedance
Current sense delay
to turn-OFF
Blanking time
Minimum Turn-ON
time
Test conditions
(See
Figure 12 on page 14)
V
FB
= 0 V
(See
Figure 12 on page 14)
(See
Figure 12 on page 14)
I
D
= 0 mA
(See
Figure 12 on page 14)
I
D
= 0.2 A
0.32
Min
Typ
320
0.4
0.9
1.2
200
500
700
0.48
A
mA
kΩ
ns
ns
ns
Max
Unit
Table 7.
Symbol
T
SD
T
HYST
Overtemperature section
Parameter
Thermal shutdown
temperature
Thermal shutdown
hysteresis
Test conditions
(See
Figure 13 on page 14)
(See
Figure 13 on page 14)
Min
140
Typ
170
40
Max
Unit
°C
°C
Table 8.
Typical power capability
Mains type
SO-8
8W
5W
DIP-8
13W
8W
European (195 - 265 Vac)
US / Wide range (85 - 265 Vac)
Doc ID 11977 Rev 2
5/21
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