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參數(shù)資料
| 型號(hào)： | SC1153 |
| 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（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（電壓型脈寬調(diào)制控制器）） |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SC1153 |
4
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Block Diagram
SC1153
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 reference.
The output of the error amplifier is compared to the trian-
gular output of the internal oscillator to generate a fixed
frequency, variable duty cycle pulse train. The internal os-
cillator uses an on-chip capacitor and precision trimmed
current sources to set the frequency to 200 kHz.
The generated pulse train is gated with the output of the
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.
The PWRGOOD and OVP signals are derived from the volt-
age at the VOSENSE pin by comparators fed from the in-
ternal feedback chain.
Applications Information - Theory of Operation
VID4
VID3
VID2
VID1
ERROR
AMP
LEVEL SHIFT
AND DRIVE
DH
CONTROL
BSTH
PWRGOOD
VID0
VOSENSE
+
-
D/A
+
-
LOW SIDE
DRIVE
R
S
Q
PGNDH
+
-
DL
GND
1.25V REF
BSTDL
70mV
PGNDL
+
-
OSCILLATOR
+
-
VCC
SHOOT-THROUGH
OVP
VCC
+
-
CURRENT LIMIT
OPEN
CS-
EN
CS+
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC1153CSW | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1153CSW.TR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1154 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1154CSW | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1155 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Programmable Synchronous DC/DC Hysteretic Controller with VRM 9.0VID Range |
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