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PDF ( 数据手册 , 数据表 ) VIPer12AS

零件编号 VIPer12AS
描述 LOW POWER OFF LINE SMPS PRIMARY SWITCHER
制造商 STMicroelectronics
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VIPer12AS 数据手册, 描述, 功能
VIPer12ADIP
® VIPer12AS
LOW POWER OFF LINE SMPS PRIMARY SWITCHER
TYPICAL POWER CAPABILITY
Mains type
SO-8
European
(195 - 265 Vac)
8W
US / Wide range
(85 - 265 Vac)
5W
DIP8
13 W
8W
n FIXED 60 KHZ SWITCHING FREQUENCY
n 9V TO 38V WIDE RANGE VDD VOLTAGE
n CURRENT MODE CONTROL
n AUXILIARY UNDERVOLTAGE LOCKOUT
WITH HYSTERESIS
n HIGH VOLTAGE START UP CURRENT
SOURCE
n OVERTEMPERATURE, OVERCURRENT AND
OVERVOLTAGE PROTECTION WITH
AUTORESTART
DESCRIPTION
The VIPer12A combines a dedicated current mode
PWM controller with a high voltage Power
BLOCK DIAGRAM
SO-8
DIP-8
PACKAGE
SO-8
DIP-8
ORDER CODES
TUBE
T&R
VIPer12AS VIPer12AS13TR
VIPer12ADIP
MOSFET on the same silicon chip. 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
PWM
LATCH
Q
R2 R3 R4
OVERVOLTAGE
R LATCH
S FF Q
BLANKING
+
_ 0.23 V
1 k
230
SOURCE
September 2002
1/15







VIPer12AS pdf, 数据表
VIPer12ADIP / VIPer12AS
Figure 8 : Rectangular U-I output characteristics for battery charger
AC IN
F1
T2
C3
D4
C4
C5
ISO1
C6
R1 C2
D1
D3
U1
FB
VDD
CONTROL
VIPerX2A
DRAIN
SOURCE
T1 C1
D2
C7
R2
D5
DCOUT
C10
R5
R7
R10
U2
R3
Vcc
Vref
C8
-
+
GND
R8 TSM101
+
-
R4
C9
R6
R9
GND
RECTANGULAR U-I OUTPUT
CHARACTERISTIC
A complete regulation scheme can achieve
combined and accurate output characteristics.
Figure 8 presents a secondary feedback through
an optocoupler driven by a TSM101. This device
offers two operational amplifiers and a voltage
reference, thus allowing the regulation of both
output voltage and current. An integrated OR
function performs the combination of the two
resulting error signals, leading to a dual voltage
and current limitation, known as a rectangular
output characteristic.
This type of power supply is especially useful for
battery chargers where the output is mainly used in
current mode, in order to deliver a defined charging
rate. The accurate voltage regulation is also
convenient for Li-ion batteries which require both
modes of operation.
WIDE RANGE OF VDD VOLTAGE
The VDD pin voltage range extends from 9V to 38V.
This feature offers a great flexibility in design to
achieve various behaviors. In figure 8 a forward
configuration has been chosen to supply the
device with two benefits:
– as soon as the device starts switching, it
immediately receives some energy from the
auxiliary winding. C5 can be therefore reduced
and a small ceramic chip (100 nF) is sufficient to
insure the filtering function. The total start up
time from the switch on of input voltage to output
voltage presence is dramatically decreased.
– the output current characteristic can be
maintained even with very low or zero output
voltage. Since the TSM101 is also supplied in
forward mode, it keeps the current regulation up
whatever the output voltage is.The VDD pin
voltage may vary as much as the input voltage,
that is to say with a ratio of about 4 for a wide
range application.
8/15














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