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參數資料
| 型號： | TPS40056PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數： | 5/32頁 |
| 文件大?。?/td> | 747K |
| 代理商： | TPS40056PWPRG4 |
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TPS40056
SLVS612 APRIL 2006
13
www.ti.com
APPLICATION INFORMATION
LOOP COMPENSATION
Voltage-mode buck-type converters are typically compensated using Type III networks. Since the TPS40056
includes no voltage feedforward control, the gain of the PWM modulator must be included. The modulator gain
is described in Figure 5.
A
MOD +
V
IN
V
S
or
A
MOD(dB) + 20
log
V
IN
V
S
Duty dycle, D, varies from 0 to 1 as the control voltage, VC, varies from the minimum ramp voltage to the
maximum ramp voltage, VS. Also, for a synchronous buck converter, D = VO / VIN. To get the control voltage
to output voltage modulator gain in terms of the input voltage and ramp voltage,
D
+
V
O
V
IN
+
V
C
V
S
or
V
O
V
C
+
V
IN
V
S
Calculate the Poles and Zeros
For a buck converter using voltage mode control there is a double pole due to the output L-CO. The double pole
is located at the frequency calculated in equation (16).
f
LC +
1
2
p
L
C
O
(Hertz)
There is also a zero created by the output capacitance, CO, and its associated ESR. The ESR zero is located
at the frequency calculated in equation (17).
f
Z +
1
2
p
ESR
C
O
(Hertz)
Calculate the value of RBIAS to set the output voltage, VOUT.
R
BIAS +
V
EA_REF
R1
V
OUT * VEA_REF
W
The maximum crossover frequency (0 dB loop gain) is calculated in equation (19).
f
C +
f
SW
4
(Hertz)
Typically, fC is selected to be close to the midpoint between the L-CO double pole and the ESR zero. At this
frequency, the control to output gain has a –2 slope (40 dB/decade), while the Type III topology has a +1 slope
(20 dB/decade), resulting in an overall closed loop –1 slope (20 dB/decade).
Figure 5 shows the modulator gain, L-C filter, output capacitor ESR zero, and the resulting response to be
compensated.
(14)
(15)
(16)
(17)
(18)
(19)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS40057 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40057PWP | 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40057PWP | 制造商:Texas Instruments 功能描述:CONTROLLER IC |
| TPS40057PWPG4 | 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40057PWPR | 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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