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KA7552A 데이터시트(PDF) 1 Page - Fairchild Semiconductor

부품명 KA7552A
상세설명  SMPS Controller
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7552A 데이터시트(HTML) 1 Page - Fairchild Semiconductor

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©2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
• Built-in drive circuits for direct connection power
MOSFET (lO = ±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
8
7
1
6
5
4
3
2
CS
CT
RT
VCC
OUTPUT
GND
IS(+)
FB
0.56 ~ 0.42V
10uA
7V
PWM
2.4V
1.9V
O.C.P
0.24V
4.3K
OFF
3.6V
2.8V
OSC
UVLO
R
S
Q
BIAS
(4V)
+
_
+
-
-
-
_
+
+
-
+
-
KA7552A/KA7553A
SMPS Controller


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