SC4525DEVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4525DEVB' PDF : 21 Pages View PDF
SC4525D
Block Diagram
COMP
6
FB
7
ROSC
3
SS/EN
5
-
+ EA
+
SLOPE
COMP +
S
+
V1
FREQUENCY
FOLDBACK
+
PWM
-
OSCILLATOR
+
ISEN
-
OC
+
ILIM
18mV
-
BST
8
S
Q
R
CLK
+
A1
-
R
1.2V
R
1V
1.9V
REFERENCE
& THERMAL
SHUTDOWN
FAULT
SOFT- START
AND
OVERLOAD
HICCUP
CONTROL
IN
2
3.53m W
POWER
TRANSISTOR
1
SW
GND
4
Figure 2. SC4525D Block Diagram
SS/EN
1.9V
IC
2.4mA
-
+B4
B1
1V/2.15V
S
Q
R
B2
OVERLOAD
FAULT
ID
3.9mA
_S
Q
R
B3
OC
PWM
© 2011 Semtech Corp.
Figure 3. Soft-start and Overload Hiccup Control Circuit
www.semtech.com
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