Ktl-icon-tai-lieu

IC viper22a

Được đăng lên bởi hoang-bao-thai
Số trang: 15 trang   |   Lượt xem: 7032 lần   |   Lượt tải: 0 lần
VIPer22ADIP
VIPer22AS

®

LOW POWER OFF LINE SMPS PRIMARY SWITCHER
TYPICAL POWER CAPABILITY
Mains type

SO-8

DIP-8

European
(195 - 265 Vac)

12 W

20 W

US / Wide range
(85 - 265 Vac)

7W

12 W

SO-8

DIP-8

ORDER CODES

n
n
n
n

PACKAGE

FIXED 60 KHZ SWITCHING FREQUENCY

SO-8
DIP-8

9V TO 38V WIDE RANGE VDD VOLTAGE

TUBE
T&R
VIPer22AS
VIPer22AS13TR
VIPer22ADIP -

CURRENT MODE CONTROL
AUXILIARY UNDERVOLTAGE LOCKOUT
WITH HYSTERESIS

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.

n HIGH VOLTAGE START UP CURRENT
SOURCE

n OVERTEMPERATURE, OVERCURRENT AND
OVERVOLTAGE PROTECTION WITH
AUTORESTART
DESCRIPTION
The VIPer22A combines a dedicated current mode
PWM controller with a high voltage Power
BLOCK DIAGRAM

DRAIN

ON/OFF
60kHz
OSCILLATOR

REGULATOR

INTERNAL
SUPPLY

OVERTEMP.
DETECTOR

R1

S
FF

PWM
LATCH
Q

R2 R3 R4

_

VDD

+
BLANKING

8/14.5V

+

+
42V

_

S

R
FF

_

0.23 V

OVERVOLTAGE
LATCH

230 Ω

Q
1 kΩ

FB

SOURCE

September 2002

1/15

VIPer22ADIP / VIPer22AS
PIN FUNCTION
Name

Function

VDD

Power supply of the control circuits. Also provides a charging current during start up thanks to a high
voltage current source connected to the drain. For this purpose, an hysteresis comparator monitors the
VDD voltage and provides two thresholds:
- VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns off the start up
current source.
- VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on the start up current
source.

SOURCE
DRAIN

FB

Power MOSFET source and circuit ground reference.
Power MOSFET drain. Also used by the internal high voltage current source during start up phase for
charging the external VDD capacitor.
Feedback input. The useful voltage range extends from 0V to 1V, and defines the peak drain MOSFET
current. The current limitation, which corresponds to the maximum drain current, is obtained for a FB pin
shorted to the SOURCE pin.

CURRENT AND VOLTAGE CONVENTIONS

I DD

ID

VDD

I FB
FB

VDD
VFB

DRAIN

CONTROL

VD
SOURCE

...
September 2002 1/15
VIPer22ADIP
VIPer22AS
LOW POWER OFF LINE SMPS PRIMARY SWITCHER
®
TYPICAL POWER CAPABILITY
FIXED 60 KHZ 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
AUTORESTART
DESCRIPTION
The VIPer22A combines a dedicated current mode
PWM controller with a high voltage Power
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 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.
Overvoltage protection in hiccup mode.
Mains type SO-8 DIP-8
European
(195 - 265 Vac)
12 W 20 W
US / Wide range
(85 - 265 Vac)
7 W 12 W
ORDER CODES
PACKAGE TUBE T&R
SO-8 VIPer22AS VIPer22AS13TR
DIP-8 VIPer22ADIP -
SO-8 DIP-8
BLOCK DIAGRAM
ON/OFF
0.23 V
DRAIN
SOURCE
VDD
PWM
LATCH
60kHz
OSCILLATOR
BLANKING
+
_
8/14.5V
_
+
FF
S
R1
R4
Q
R3
FB
REGULATOR
INTERNAL
SUPPLY
OVERVOLTAGE
LATCH
OVERTEMP.
DETECTOR
1 k
42V
_
+
R2
FF
S
R
Q
230
IC viper22a - Trang 2
Để xem tài liệu đầy đủ. Xin vui lòng
IC viper22a - Người đăng: hoang-bao-thai
5 Tài liệu rất hay! Được đăng lên bởi - 1 giờ trước Đúng là cái mình đang tìm. Rất hay và bổ ích. Cảm ơn bạn!
15 Vietnamese
IC viper22a 9 10 208