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參數(shù)資料
| 型號(hào)： | SC1102 |
| 廠商： | Semtech Corporation |
| 英文描述： | SYNCHRONOUS DC/DC CONTROLLER FOR DISTRIBUTED POWER SUPPLY APPLICATIONS |
| 中文描述： | 同步DC / DC控制器的分布式電源應(yīng)用 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 146K |
| 代理商： | SC1102 |
SC1102
SYNCHRONOUS DC/DC CONTROLLER FOR
DISTRIBUTED POWER SUPPLY APPLICATIONS
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
September 5, 2000
8
THEORY OF OPERATION (CON’T)
An over-current condition occurs when the high-side
drive is turned on, but the PHASE node does not
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.
In conclusion, below is shown a typical “12V Applica-
tion Circuit” which has a BSTH voltage derived by boot-
strapping input voltage to the PHASE node through
diode D1. This circuit is very useful in cases where only
input power of 12V is available.
In order to prevent substrate glitching, a small-signal
diode should be placed in close proximity to the chip
with cathode connected to PHASE and anode con-
nected to PGND.
APPLICATION CIRCUIT
Typical 12V Application Circuit with Bootstrapped BSTH
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
Q1
Q2
R5
3.9
Optional
R4
10
L1
4uH
D2
C9
1.0
C10
180/4V
C11
180/4V
C12
180/4V
C13
180/4V
C7
C6
R1
1k
R3
1k
C2
0.1
C3
0.1
C1
0.1
1R2
PWRGD
OVP
SHDN
VREF
+
_
+
_
Vin 12V
Vout=3.3V*
R8
127
R9
205*
NOTE:
*) Vout = 1.265 x (1+R9/R8)
+5V
MD1
R6
2.2
C4
1.0
C5
C14
180/4V
C8
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC1102_06 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Voltage Mode Controller for Distributed Power Supply Applications |
| SC1102ASTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Voltage Mode Controller for Distributed Power Supply Applications |
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| SC1102CS.TR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Voltage Mode Controller for Distributed Power Supply Applications |
| SC1102CSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:SYNCHRONOUS DC/DC CONTROLLER FOR DISTRIBUTED POWER SUPPLY APPLICATIONS |
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