參數(shù)資料
型號(hào)： AAT1147IJS-0.6-T1
廠(chǎng)商： Advanced Analog Technology,lnc.
英文描述： High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter
中文描述： 高效率，低噪聲，快速瞬態(tài)400mA的降壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 9/19頁(yè)
文件大?。?/td> 620K
代理商： AAT1147IJS-0.6-T1
Control Loop
The AAT1147 is a peak current mode step-down
converter. The current through the P-channel
MOSFET (high side) is sensed for current loop
control, as well as short circuit and overload pro-
tection. A fixed slope compensation signal is added
to the sensed current to maintain stability for duty
cycles greater than 50%. The peak current mode
loop appears as a voltage-programmed current
source in parallel with the output capacitor.
The output of the voltage error amplifier programs
the current mode loop for the necessary peak
switch current to force a constant output voltage for
all load and line conditions. Internal loop compen-
sation terminates the transconductance voltage
error amplifier output. The error amplifier reference
is 0.6V.
Soft Start / Enable
Soft start limits the current surge seen at the input
and eliminates output voltage overshoot. When
pulled low, the enable input forces the AAT1147
into a low-power, non-switching state. The total
input current during shutdown is less than 1μA.
Current Limit and Over-Temperature
Protection
For overload conditions, the peak input current is
limited. To minimize power dissipation and stresses
under current limit and short-circuit conditions,
switching is terminated after entering current limit
for a series of pulses. Switching is terminated for
seven consecutive clock cycles after a current limit
has been sensed for a series of four consecutive
clock cycles.
Thermal protection completely disables switching
when internal dissipation becomes excessive. The
junction over-temperature threshold is 140°C with
15°C of hysteresis. Once an over-temperature or
over-current fault conditions is removed, the output
voltage automatically recovers.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VIN
input. Under-voltage lockout (UVLO) guarantees
sufficient V
IN
bias and proper operation of all inter-
nal circuitry prior to activation.
AAT1147
High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
1147.2006.05.1.0
9
Figure 1: Enhanced Transient Response Schematic.
C2 4.7
μ
F 10V 0805 X5R
C1 10
μ
F 6.3V 0805 X5R
4.7
μ
H
L1
10
μ
F
C1
4.7
μ
F
C2
L1 CDRH3D16-4R7
V
OUT
=1.8V
GND
V
IN
1
2
3
Enable
LX
EN
1
OUT
2
VIN
3
LX
4
AGND
5
PGND
6
PGND
7
PGND
8
AAT1147
U1
GND2
118k
R1
59k
R2
100pF
C4
n/a
C3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AAT1149 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:3MHz Fast Transient 400mA Step-Down Converter
AAT1149_08 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:3MHz Fast Transient 400mA Step-Down Converter
AAT1149A 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:2.2MHz Fast Transient 400mA Step-Down Converter
AAT1149AIUV-1.875-T1 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2.2MHz Fast Trans 400mA StepDown Cnvrt RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
AAT1149B 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:2.2MHz Fast Transient 400mA Step-Down Converter
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