参数资料
型号: KA7553A
厂商: Fairchild Semiconductor
文件页数: 1/6页
文件大小: 0K
描述: IC REG CTRLR PWM VM 8-DIP
标准包装: 50
PWM 型: 电压模式
输出数: 1
频率 - 最大: 600kHz
占空比: 49%
电源电压: 8.7 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -25°C ~ 85°C
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
www.fairchildsemi.com
KA7552A/KA7553A
SMPS Controller
Features
? Built-in drive circuits for direct connection power
MOSFET (l O = ± 1.5A)
? Wide operating frequency range (5kHz ~ 600kHz)
? Pulse by pulse over current limiting
? Over load protection
? On/off control by external trigger
? Internal UVLO
? Low standby current (typ. 90uA)
? Soft start circuit
Description
The KA7552A/KA7553A are switching power control IC
for wide operating frequency range. The internal circuits
include pulse by pulse current limiting, protection, on/off
control by external trigger, low standby current, soft start,
and high current totempole output for driving a POWER
MOSFET. Maximum duty of the KA7552A is 70% and the
KA7553A is 46%. When duty is maximum, the input
threshold voltage of pin2 & pin8 are not same in KA7552A
and KA7553A.
8-DIP
1
Internal Block Diagram
CS
C T
R T
V CC
+
_
0.56 ~ 0.42V
8
7
1
10uA
6
OSC
+
-
7V
UVLO
BIAS
(4V)
OFF
3.6V
4.3K
2.8V
+
-
2.4V
1.9V
+
-
-
-
PWM
5
OUTPUT
2
FB
0.24V
3
IS(+)
_
+
O.C.P
R
S
Q
4
GND
Rev. 1.0.2
?2004 Fairchild Semiconductor Corporation
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