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| 型號： | SYNCHRONOUS |
| 英文描述： | Synchronous DC/DC Controller for Distributed Power Applications (131k) |
| 中文描述： | 同步DC / DC對于分布式電源應(yīng)用（131k控制器） |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 131K |
| 代理商： | SYNCHRONOUS |
AN99-7
Synchronous DC/DC Controller for
Distributed Power Supply Applications
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
January 4, 2000
3
TYPICAL APPLICATION
reach the voltage level set at the OCSET pin. The
PHASE node is sampled only once per cycle during the
valley of the triangular oscillator. Once an over-current
occurs, the high-side drive is turned off and the low-
side drive turns on and the SS/SHDN pin begins to
sink 2uA. The soft-start voltage will begin to decrease
as the 2uA of current discharges the external capaci-
tor. When the soft-start voltage reaches 0.8V, the SS/
SHDN pin will begin to source 10uA and begin to
charge the external capacitor causing the soft-start
voltage to rise again. Again, when the soft-start volt-
age reaches the level of the internal oscillator, switch-
ing will occur.
If the over-current condition is no longer present, nor-
mal operation will continue. If the over-current condi-
tion is still present, the SS/SHDN pin will again begin to
sink 2uA. This cycle will continue indefinitely until the
over-current condition is removed.
VCC
1
PWRGD
2
OVP
3
OCSET
4
PHASE
5
DRVH
6
PGND
7
DRVL
8
BSTL
9
BSTH
10
SENSE
11
VREF
12
SS/SHDN
13
GND
14
SU1
SQ1
SQ2
R
3.9
R7
3.9
D4
R3
10
L1
4uH
LL42
C11
0.1
C11
C12
C13
C14
C4
C1
C2
C3
C5
0.1
R2
1k
R4
1k
C7
1.0
C8
0.3
C9
0.1
R1
620
PWRGD
OVP
SHDN
VREF
+
_
+
_
Vin 12V
Vout +2.5V
C15
0.1
R8
127
R9
124*
NOTE:
*) Vout = 1.265 x (1+R9/R8)
+5V
LL42
Theory of Operation (Cont.)
CHARACTERISTIC CURVES
SC1102 Voltage Regulation, Vin=5V
-2%
-1%
0%
1%
2%
0
1
2
3
4
5
6
7
8
9
10
11 12
Current, A
3.3V
2.5V
2.0V
1.3V
SC1102 Effiency, Vin=5V
60%
70%
80%
90%
100%
0
1
2
3
4
5
6
7
8
9
10
11
12
Current, A
3.3V
2.5V
2.0V
1.3V
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