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SC4525DEVB Scheda tecnica(PDF) 6 Page - Semtech Corporation

Il numero della parte SC4525DEVB
Spiegazioni elettronici  18V, 3A, 350kHz Step-Down Switching Regulator
PDF  21 Pages
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Produttore elettronici  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4525DEVB Scheda tecnica(HTML) 6 Page - Semtech Corporation

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© 2011 Semtech Corp.
www.semtech.com
SC4525D
6
Block Diagram
IN
2
ROSC
3
TRANSISTOR
R
Q
S
POWER
SLOPE
COMP
+
-
ISEN
ILIM
+
-
18mV
3.53mW
+
+
S
BST
REFERENCE
& THERMAL
SHUTDOWN
1V
FAULT
SOFT- START
AND
OVERLOAD
HICCUP
CONTROL
1.9V
R
8
SW
1
FB
7
SS/EN
5
COMP
6
OSCILLATOR
CLK
EA
PWM
+
-
+
1.2V
-
FREQUENCY
FOLDBACK
GND
4
+
+
-
R
OC
A1
V1
IN
2
ROSC
3
TRANSISTOR
R
Q
S
POWER
SLOPE
COMP
+
-
ISEN
ILIM
+
-
18mV
3.53mW
+
+
S
BST
REFERENCE
& THERMAL
SHUTDOWN
1V
FAULT
SOFT- START
AND
OVERLOAD
HICCUP
CONTROL
1.9V
R
8
SW
1
FB
7
SS/EN
5
COMP
6
OSCILLATOR
CLK
EA
PWM
+
-
+
1.2V
-
FREQUENCY
FOLDBACK
GND
4
+
+
-
R
OC
A1
V1
FAULT
SS/EN
OVERLOAD
1V/2.15V
S
Q
R
+
2.4mA
3.9mA
1.9V
-
S
R
OC
PWM
Q
_
B1
B2
B3
B4
IC
ID
FAULT
SS/EN
OVERLOAD
1V/2.15V
S
Q
R
+
2.4mA
3.9mA
1.9V
-
S
R
OC
PWM
Q
_
B1
B2
B3
B4
IC
ID
Figure 2. SC4525D Block Diagram
Figure 3. Soft-start and Overload Hiccup Control Circuit



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