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參數資料
| 型號： | TPS40022PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | POWERPAD, PLASTIC, HTSSOP-16 |
| 文件頁數： | 10/29頁 |
| 文件大小： | 337K |
| 代理商： | TPS40022PWPR |
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TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
18
REFERENCE DESIGN
Input and Output Capacitors
The output capacitance and its ESR needed are calculated in equations (5) and (6).
Compensation Design
Voltage-mode control is used in this evaluation module, using R2, R7, R8, C14, C15, and C16 to form a Type-III
compensator network. The L-C frequency of the power stage is approximately 4.9-kHz and the ESR-zero is
around 34 kHz. The overall crossover frequency, f0db, is chosen at 43-kHz for reasonable transient response
and stability. Two zeros fZ1 and fZ2 from the compensator are set at 2.4 kHz and 1.9 kHz. The two poles, fP1
and fP2 are set at 52 kHz and 115 kHz. The frequency of poles and zeros are defined by the following equations:
f
Z1 +
1
2
p
R7
C14
f
Z2 +
1
2
p
R2
C11
(assuming R2
R8)
f
P1 +
1
2
p
R8
C11
f
P2 +
1
2
p
R7
C12
(assuming C14
C12)
The transfer function for the compensator is calculated in equation (10).
A(s)
+
(1
) s
C14
R7)
[1
) s
C11
(R2
) R3)]
s
R2
C14
1
) C12
C14 )
s
R7
C12
(1
) s
R8
C11)
Figure 15 shows the close loop gain and phase. The overall crossover frequency is approximately 43 kHz. The
phase margin is 60
°.
100
–20
50
40
30
20
10
0
–10
1 k
10 k
100 k
80
50
20
–10
110
140
–40
fOSC – Oscillator Frequency – kHz
Gain
–
dB
Gain
Phase
–
°
OVERALL GAIN AND PHASE
vs
OSCILLATOR FREQUENCY
Figure 10.
(8)
(9)
(10)
(11)
(12)
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| TPS40040DRBR | 功能描述:DC/DC 開關控制器 Lo Vin Synch Buck DC/DC Cntrlr 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 |
| TPS40040DRBRG4 | 功能描述:DC/DC 開關控制器 Lo Vin Synch Buck DC/DC Cntrlr 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 |
| TPS40040DRBT | 功能描述:DC/DC 開關控制器 Low Vin Synch Buck DC/DC Controller 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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