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參數(shù)資料
| 型號： | AAT2158 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1.5A Low Noise Step-Down Converter |
| 中文描述： | 1.5A的低噪聲降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 684K |
| 代理商： | AAT2158 |
AAT2158
1.5A Low Noise Step-Down Converter
10
2158.2007.10.1.1
Peak current mode control and optimized internal
compensation provide high loop bandwidth and excel-
lent response to input voltage and fast load transient
events. Soft start eliminates output voltage overshoot
when the enable or the input voltage is applied. Under-
voltage lockout prevents spurious start-up events.
Control Loop
The AAT2158 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 reference voltage is
internally set to program the converter output volt-
age greater than or equal to 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 AAT2158
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 VCC
input. Under-voltage lockout (UVLO) guarantees
sufficient V
IN
bias and proper operation of all inter-
nal circuitry prior to activation.
Figure 3: AAT2158 Evaluation Schematic.
3.0μH
L1
22μF
C3
10μF
C1
100
R1
0.1μF
C2
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
C3 Murata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH5D28-3R0NC (see Table 2)
R1 and C2 are an optional noise filter for internal V
CC
.
R6, C4, C5-C7 are not populated
C8 100pF feed forward
V
OUT
+
V
IN
+
LX
14
N/C
6
EN
7
VCC
9
VP
10
N/C
8
LX
13
PGND
3
VP
12
VP
11
FB
4
LX
15
PGND
2
PGND
1
SGND
5
N/C
16
AAT2158
U1
R3
C8
59.0k
R4
100K
R2
Enable
LX
GND
GND
V
OUT
(V) R3 (k
Ω
)
0.9 29.4
1.0 39.2
1.1 49.9
1.2 59.0
1.3 68.1
1.4 78.7
1.5 88.7
1.8 118
2.0 137
2.5 187
3.3 267
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2158_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1.5A Low Noise Step-Down Converter |
| AAT2158_0810 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1.5A Low Noise Step-Down Converter |
| AAT2158AIVN-0.6-T1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5A Low Noise Step-Down Converter 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 |
| AAT2158IVN-0.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER 制造商:SKYWORKS 功能描述:ANALOG IC |
| AAT2215IWP-T1 | 制造商: 功能描述:3.0-5.5Vout .6-4Amp 600KHz Step-Up 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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