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PDF VIPER12AS-E Data sheet ( Hoja de datos )

Número de pieza VIPER12AS-E
Descripción Low Power OFF-Line SMPS Primary Switcher
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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VIPer12ADIP - E
VIPer12AS - E
Low Power OFF-Line SMPS Primary Switcher
Features
Fixed 60kHZ Switching Frequency
9V to 38V Wide Range VDD 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) 8W for SO-8,
13W for DIP-8
– European (85 - 265 Vac) 5W for SO-8,
8W for DIP-8
Description
The VIPer12A combines a dedicated current
mode PWM controller with a high voltage Power
MOSFET on the same silicon chip.
Block diagram
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 VDD pin
accommodates changes in auxiliary supply
voltage. This feature is well adapted to
battery charger adapter configurations.
– Automatic burst mode in low load condition.
– Overvoltage protection in HICCUP mode.
DRAIN
REGULATOR
INTERNAL
SUPPLY
VDD
FB
_
8/14.5V +
+
42V _
ON/OFF
60kHz
OSCILLATOR
OVERTEMP.
DETECTOR
S
R1 FF Q
R2 R3 R4
PWM
LATCH
OVERVOLTAGE
R LATCH
S FF Q
BLANKING
January 2006
DocRev1
+
_ 0.23 V
1 k
230
SOURCE
1/21
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1 page




VIPER12AS-E pdf
VIPer12ADIP/ AS - E
Electrical characteristics
Table 5. Oscillation section
Symbol
Parameter
Test conditions
FOSC
Oscillator frequency
total variation
VDD = VDDoff ... 35V;
TJ = 0 ... 100°C
Table 6. PWM Comparator section
Symbol
Parameter
Test Conditions
GID IFB to ID current gain (See Figure 11 on page 14)
IDlim
Peak current
limitation
VFB = 0V
(See Figure 11 on page 14)
IFBsd
RFB
IFB Shutdown current (See Figure 11 on page 14)
FB Pin input
impedance
ID = 0mA
(See Figure 11 on page 14)
td
Current sense delay
to turn-OFF
ID = 0.2A
tb
tONmin
Blanking time
Minimum Turn-ON
time
Table 7. Overtemperature section
Symbol
Parameter
Test Conditions
TSD
THYST
Thermal shutdown
temperature
Thermal shutdown
hysteresis
(See Figure 12 on page 14)
(See Figure 12 on page 14)
Table 8. Typical Power Capability
Mains type
European (195 - 265 Vac)
US / Wide range (85 - 265 Vac)
SO-8
8W
5W
Min. Typ. Max. Unit
54 60 66 kHz
Min.
Typ.
320
Max.
Unit
0.32 0.4 0.48 A
0.9 mA
1.2 k
200 ns
500 ns
700 ns
Min. Typ. Max. Unit
140 170
°C
40 °C
DIP-8
13W
8W
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VIPER12AS-E arduino
VIPer12ADIP/ AS - E
7 Startup sequence
Figure 6. Startup sequence
Startup sequence
This device includes a high voltage start up current source connected on the drain of the
device. As soon as a voltage is applied on the input of the converter, this start up current
source is activated as long as VDD is lower than VDDon. When reaching VDDon, the start up
current source is switched off and the device begins to operate by turning on and off its main
power MOSFET. As the FB pin does not receive any current from the optocoupler, the
device operates at full current capacity and the output voltage rises until reaching the
regulation point where the secondary loop begins to send a current in the optocoupler. At
this point, the converter enters a regulated operation where the FB pin receives the amount
of current needed to deliver the right power on secondary side.
This sequence is shown in Figure 6. Note that during the real starting phase tss, the device
consumes some energy from the VDD capacitor, waiting for the auxiliary winding to provide
a continuous supply. If the value of this capacitor is too low, the start up phase is terminated
before receiving any energy from the auxiliary winding and the converter never starts up.
This is illustrated also in the same figure in dashed lines.
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