- 您現在的位置：買賣IC網 > PDF目錄381232 > AAT1156_07 (Advanced Analog Technology,lnc.) 1MHz 700mA Step-Down DC-DC Converter PDF資料下載
參數資料
| 型號： | AAT1156_07 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1MHz 700mA Step-Down DC-DC Converter |
| 中文描述： | 1MHz的700mA的降壓型DC - DC轉換器 |
| 文件頁數： | 8/15頁 |
| 文件大小： | 586K |
| 代理商： | AAT1156_07 |
AAT1156
1MHz 700mA Step-Down DC-DC Converter
8
1156.2007.01.1.4
Functional Block Diagram
VP = 2.7V to 5.5V
VCC
EN
SGND
PGND
LOGIC
1.0V REF
Temp.
Sensing
OSC
OP. AMP
LX
FB
DH
DL
CMP
1M
Ω
LL
Operation
Control Loop
The AAT1156 is a peak current mode step-down
converter. The inner wide bandwidth loop controls
the inductor peak current. The inductor current is
sensed through the P-channel MOSFET (high
side) and is also used for short-circuit and overload
protection. A fixed slope compensation signal is
added to the sensed current to maintain stability for
duty cycles greater than 50%. The loop appears
as a voltage-programmed current source in paral-
lel with the output capacitor.
The voltage error amplifier output programs the
current loop for the necessary inductor current to
force a constant output voltage for all load and line
conditions. The external voltage feedback resistive
divider divides the output voltage to the error ampli-
fier reference voltage of 0.6V. The voltage error
amplifier DC gain is limited. This eliminates the
need for external compensation components, while
still providing sufficient DC loop gain for good load
regulation. The voltage loop crossover frequency
and phase margin are set by the output capacitor.
Soft Start/Enable
Soft start increases the inductor current limit point in
discrete steps once the input voltage or enable
input is applied. It limits the current surge seen at
the input and eliminates output voltage overshoot.
When pulled low, the enable input forces the
AAT1156 into a non-switching shutdown state. The
total input current during shutdown is less than 1
A.
Power and Signal Source
Separate small signal ground and power supply
pins isolate the internal control circuitry from the
noise associated with the output MOSFET switch-
ing. The low pass filter R1 and C2 (shown in the
schematic in Figure 1) filters the input noise asso-
ciated with the power switching.
相關PDF資料 |
PDF描述 |
|---|---|
| AAT1156IVN-T1 | 1MHz 700mA Step-Down DC-DC Converter |
| AAT1171IWP-1-T1 | 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch |
| AAT1171 | 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch |
| AAT1201 | 250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH DUAL-OUTPUT POWER MANAGEMENT |
| AAT1201-S | 250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH DUAL-OUTPUT POWER MANAGEMENT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AAT1156IVN-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 700mA Step-Down DC-DC Converter |
| AAT1157 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 1.2A Buck DC/DC Converter |
| AAT1157IVN-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1160 | 制造商:AAT 制造商全稱:AAT 功能描述:Step Up Current Mode PWM Converter with 4+1 Operational Amplifiers |
| AAT1160IRN-0.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
發(fā)布緊急采購，3分鐘左右您將得到回復。