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參數資料
| 型號： | TPS53353DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO22 |
| 封裝： | 5 X 6 MM, ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數： | 11/25頁 |
| 文件大?。?/td> | 556K |
| 代理商： | TPS53353DQPT |
R1
R2
Voltage
Divider
1
+
VFB
+
0.6 V
PWM
Control
Logic
and
Divider
L
ESR
COUT
VC
RLOAD
IIND
IOUT
UDG-11193
IC
Switching Modulator
Output
Capacitor
VOUT
TPS53353
VIN
VIN
LL
( ) =
OUT
1
H s
s
ESR
C
=
p
SW
0
OUT
f
1
f
2
ESR
C
4
SLUSAK2
– AUGUST 2011
Small Signal Model
From small-signal loop analysis, a buck converter using D-CAP
mode can be simplified as shown in Figure 38.
Figure 38. Simplified Modulator Model
The output voltage is compared with the internal reference voltage (ramp signal is ignored here for simplicity).
The PWM comparator determines the timing to turn on the high-side MOSFET. The gain and speed of the
comparator can be assumed high enough to keep the voltage at the beginning of each on cycle substantially
constant.
(4)
For loop stability, the 0-dB frequency,
0, defined below need to be lower than 1/4 of the switching frequency.
(5)
According to the equation above, the loop stability of D-CAPTM mode modulator is mainly determined by the
capacitor's chemistry. For example, specialty polymer capacitors (SP-CAP) have an output capacitance in the
order of several 100
F and ESR in range of 10 mΩ. These makes 0 on the order of 100 kHz or less, creating a
stable loop. However, ceramic capacitors have an
0 at more than 700 kHz, and need special care when used
with this modulator. An application circuit for ceramic capacitor is described in the External Component Selection
Using All Ceramic Output Capacitors section.
Copyright
2011, Texas Instruments Incorporated
19
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS53353DQPT | 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV 20A QFN22 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, Output Voltage:5.5V, Output Current:20A, No. of Pins:22, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:- , RoHS Compliant: No |
| TPS53353EVM-744 | 功能描述:電源管理IC開發(fā)工具 HI-EFF,20A,SYNC BUCK CONVERTER RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS53355 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Efficiency 30-A Synchronous Buck Converter with Eco-modea?￠ |
| TPS53355DQPR | 功能描述:直流/直流開關調節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS53355DQPT | 功能描述:直流/直流開關調節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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