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| 型号： | TPS40021PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 18/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWP |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
25
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 4 kHz. The two poles, fP1 and
fP2 are set at 34 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
C16
(assuming R2
R8)
f
P1 +
1
2
p
R8
C16
f
P2 +
1
2
p
R7
C15
(assuming C14
C15)
The transfer function for the compensator is calculated in equation (10).
A(s)
+
(1
) s
C14
R7)
[1
) s
C16
(R2
) R3)]
s
R2
C14
1
) C15
C14 )
s
R7
C15
(1
) s
R8
C16)
Figure 28 shows the close loop gain and phase. The overall crossover frequency is approximately 30 kHz. The
phase margin is 57
°.
10
30
10
30
50
100
1 k
10 k
100 k
0
20
40
20
40
50
200
100
150
0
100
50
150
fOSC Oscillator Frequency kHz
Gain
dB
Gain
Phase
°
OVERALL GAIN AND PHASE
vs
OSCILLATOR FREQUENCY
Figure 28.
(9)
(10)
(11)
(12)
(13)
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| TPS40021PWPR | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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