参数资料
型号: TPS40061PWPG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装: GREEN, PLASTIC, HTSOOP-16
文件页数: 8/33页
文件大小: 750K
代理商: TPS40061PWPG4
www.ti.com
VC
PWM MODULATOR RELATIONSHIPS
VS
D = VC / VS
MODULATOR GAIN
vs
SWITCHING FREQUENCY
Modulator
Gain
-
dB
fSW - Switching Frequency - Hz
100
1 k
10 k
100 k
ESR Zero, + 1
LC Filter, - 2
AMOD = VIN / VS
Resultant, - 1
GAIN
180
°
90
°
270
°
PHASE
+ 1
1
0 dB
RBIAS
UDG02189
+
R1
R3
C3
C2
(optional)
C1
R2
7
8
VREF
COMP
VFB
VOUT
f
Z1 +
1
2p
R2
C1
(Hz)
f
Z2 +
1
2p
R1
C3
(Hz)
(25)
f
P1 +
1
2p
R2
C2
(Hz)
f
P2 +
1
2p
R3
C3
(Hz)
f
C +
1
2p
R1
C2
G
(Hertz)
(26)
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Figure 8.
Figure 9.
Figure 10. Type III Compensation of Configuration
Figure 11. Type III Compensation Gain and Phase
The poles and zeros for a type III network are described in Equation 25.
The value of R1 is somewhat arbitraty, but influences other component values. A value between 50k
and
100k
usually yields reasonable values.
The unity gain frequency is described in Equation 26.
where G is the reciprocal of the modulator gain at fC.
16
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