- 您現(xiàn)在的位置：買(mǎi)賣IC網(wǎng) > PDF目錄374712 > SC1156 (Semtech Corporation) Programmable Synchronous DC/DC Controller(工作于單12V電源,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）) PDF資料下載
參數(shù)資料
| 型號(hào)： | SC1156 |
| 廠商： | Semtech Corporation |
| 英文描述： | Programmable Synchronous DC/DC Controller(工作于單12V電源,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（工作于單12V的電源，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(yè)數(shù)： | 4/7頁(yè) |
| 文件大小： | 162K |
| 代理商： | SC1156 |
4
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Block Diagram
SC1156
The D/A Converter generates an output voltage determined
by an internal trimmed bandgap voltage reference and
the status of the VID0 through VID4 inputs. This voltage is
applied to the non-inverting input of the error amplifier,
the inverting input of the error amplifier is fed from the
VOSENSE pin via a precision resistor divider. The error
amplifier itself is a transconductance amplifier with an in-
ternal load resistor. The open loop gain is internally set to
approximately 40 dB.
The internal oscillator uses an on-chip capacitor and a
trimmed precision current source to set the frequency of
oscillation to 200 kHz. The triangular output of the oscil-
lator is compared to the output of the error amplifier. The
output of the PWM comparator is a pulse width modu-
lated signal whose duty cycle increases as the voltage at
the VOSENSE pin decreases.
The output of the current limit comparator goes high when
Theory of Operation
+
-
OVP
D/A
CS+
VID4
VID3
PGNDH
70mV
PWRGOOD
DL
+
-
BSTH
SHUTDOWN
VCC
GND
LOW SIDE
CONTROL
VID2
VID1
OSCILLATOR
CS-
1.25V REF
EN
VOSENSE
+
-
BSTDL
+
-
CURRENT LIMIT
SHOOT-THRU
VID0
+
-
DH
ERROR
PGNDL
LEVEL SHIFT
AND DRIVE
R
S
Q
OPEN
VCC
+
-
its input voltage exceeds approximately 70mV, this sets
the current limit latch, immediately terminating the cur-
rent ON time. The current limit latch is reset in the middle
of the OFF time when the triangular wave oscillator reaches
its highest point .
When the output of the PWM comparator is high, output
DH is driven high, provided that the VID code is valid, the
current limit latch has not been set and the Enable (EN)
pin is not pulled low. When the PWM comparator output is
low DL is always driven high.
The Shoot-through control circuitry modifies the DH and
DL waveforms slightly, ensuring that there is a short delay
between one turning OFF and the other turning ON. This
ensures that the ON times of the external FETs driven by
DH and DL do not overlap.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC1157CS | PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1157CS.TR | PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| SC1157 | 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）) |
| SC1158 | 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2V-3.5V,電壓型脈寬調(diào)制控制器）) |
| SC1163 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1156CSW | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS |
| SC1157 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。