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參數(shù)資料
| 型號(hào)： | SC1157 |
| 廠商： | Semtech Corporation |
| 英文描述： | Programmable Synchronous DC/DC Controller(用于先進(jìn)微處理器的可編程同步DC/DC控制器（輸出電壓1.3V-2.05V,電壓型脈寬調(diào)制控制器）) |
| 中文描述： | 可編程同步DC / DC控制器（用于先進(jìn)微處理器的可編程同步直流/直流控制器（輸出電壓為1.3V - 2.05V，電壓型脈寬調(diào)制控制器）） |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大?。?/td> | 241K |
| 代理商： | SC1157 |
4
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Block Diagram
SC1157
VID2
VID1
VID0
LEVEL SHIFT AND
CS- CS+
VOSENSE
AGND
D/A
70mV
OSCILLATOR
R
S
Q
BSTH
BSTL
+
-
+
-
CURRENT
DH
+
-
DL
VID3
ERROR
AMP
PGND
EN
SHOOT-THRU
CONTROL
VCC
SYNCHRONOUS
REF
The voltage at the VOSENSE pin is applied, through the
internal precision resistor feedback chain, to the inverting
input of the error amplifier. The non-inverting input of the
error amplifier is supplied with a DC voltage derived by
the DAC from the internal trimmed bandgap voltage ref-
erence. The output of the error amplifier is compared to
the triangular output of the internal oscillator to generate
a fixed frequency, variable duty cycle pulse train. The in-
ternal oscillator uses an on-chip capacitor and precision
trimmed current sources to set the frequency to 140 kHz.
The generated pulse train is gated with the output of the
Theory of Operation
current limit latch and the inhibit signal to produce a drive
signal for the upper FET. It is also inverted to produce a
drive signal for the lower FET. These FET drive signals are
modified by the shoot-through control circuitry so that
the top FET turn-on is delayed until the bottom FET has
turned off, and visa-versa.
The current limit latch is set (ending the upper FET drive
pulse early) if the current limit comparator indicates an
overcurrent condition. The latch is reset at the start of each
oscillator period.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1157CS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1157CS.TR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1158 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1158CS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1158CS.TR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
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