参数资料
型号: TPS40052PWP
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, HTSSOP-16
文件页数: 7/33页
文件大小: 753K
代理商: TPS40052PWP
TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
15
www.ti.com
APPLICATION INFORMATION
Figure 4
VC
PWM MODULATOR RELATIONSHIPS
VS
D = VC / VS
MODULATOR GAIN
vs
SWITCHING FREQUENCY
Modulator
Gain
dB
Figure 5
fSW Switching Frequency Hz
100
1 k
10 k
100 k
ESR Zero, + 1
LC Filter, 2
AMOD = VIN / VS
Resultant, 1
A Type III topology, shown in Figure 6, has two zero-pole pairs in addition to a pole at the origin. The gain and
phase boost of a Type III topology is shown in Figure 7. The two zeros are used to compensate the L-CO double
pole and provide phase boost. The double pole is used to compensate for the ESR zero and provide controlled
gain roll-off. In many cases the second pole can be eliminated and the amplifier’s gain roll-off used to roll-off
the overall gain at higher frequencies.
RBIAS
Figure 6. Type III Compensation Configuration
UDG03099
+
R1
R3
C3
C1
R2
7
8
VREF
VOUT
COMP
VFB
C2
(optional)
Figure 7. Type III Compensation Gain and Phase
GAIN
180
°
90
°
270
°
PHASE
+ 1
1
0 dB
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