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AS998/AB8DT Datasheet

  • AS998/AB8DT

  • IC intended for use as a PWM controller

  • 6頁

  • ETC

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SEMICONDUCTOR
PWM Controller
Preliminary Specification
Description
The AS998/AS998A is an IC intended for use as a PWM controller for
switch mode power supplies. The device is particularly suited as a pri-
mary side controller for adapter, printer, peripheral, mobile chargers and
desktop auxiliary power supplies. The AS998/AS998A is manufactured
in BICMOS technology and exhibits very low start-up and operating
power. This allows the device to be suitable in applications where strin-
gent standby or Blue Angel criteria are required.
Many of the external functions associated with PWM controllers have
been integrated into the AS998/AS998A allowing the external compo-
nent count to be significantly reduced. Features such as fixed internal
oscillator, internal ramp compensation and current filters all reduce the
external support components.
AS998/A
Features
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Low start-up current 64 碌A(chǔ) (Typ)
Low running current 2 mA (Typ)
Low power light load mode
Low power standby when OV is
activated
Extended commercial operating
temperature range: 0 to 105擄C
On-board fixed frequency oscillator 100
kHz (Typ)
Frequency randomizer to reduce EMC
emissions
Dedicated OV shutdown pin
On-board voltage ramp compensation
On-board current sensing filtering
Optional primary side regulation
Pin Configuration 鈥?/div>
Top View
OV
Comp
V
FB
LI
V
REG
8L PDIP (8N)
1
2
3
4
M
8L SOIC (8D)
OV
Comp
V
FB
I
SENSE
1
2
3
4
8
7
6
5
8
7
6
5
IN
V
REG
V
CC
OUT
GND
V
CC
OUT
GND
I
SENSE
P
Ordering Information
AS998/A
B 8D
N
Packaging Option:
T = Tubes
N = Tape and Reel (13" Reel Dia.)
Package Type:
8D = 8 Pin, Plastic SOIC
8N = 8 Pin, Plastic DIP
Circuit Type:
PWM Controller (Models AS998 & AS998A)
Temperature Range:
B = 0擄C to 105擄C
www.ptcc.com.tw
R
E
233
A
The AS998/AS998A has a typical output rise and fall time of 250/210 ns.
R
Y

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