參數(shù)資料
型號(hào)： TPS5103DB
廠商： Texas Instruments, Inc.
英文描述： MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
中文描述： 多模同步DC / DC控制器
文件頁數(shù)： 26/37頁
文件大小： 1052K
代理商： TPS5103DB
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240 – SEPTEMBER 1999
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
there is one pole, one zero and one integrator:
Zero
1
2 C3R4
Pole
1
2 C2R4
Integrator
1
2
C3R2
The loop-gain concept is used to design a stable and fast feedback control. The loop-gain equation is derived
by that the control-to-output transfer function times the compensation:
Loop
gain
Vod X
Comp
By using a bode plot, the amplitude and the phase of this equation can be drawn with software such as MathCad.
In turn, the stability can be easily designed by adjusting the compensation perimeters. The sample bode plot
is shown below to explain the phase margin, gain margin and the crossover frequency.
The gain is drawn as 20 log (loop-gain), and the phase is in degrees. To explain them clearer, 180 degrees is
added to the phase, so that the gain and phase share the same zero.
Where the gain curve touches the zero is the crossover frequency. The higher this frequency is, the faster the
transient response is, since the transient recovery time is 1/(crossover frequency). The phase to the zero is the
phase margin at the crossover frequency. The phase margin should be at least 60 degrees to cover all the
condition changes such as temperature. The gain margin is the gap between gain curve and the zero when the
phase curve touches the zero. This margin should be at least 20 dB to guarantee the stability over all conditions.
Phase
Margin
Phase
Gain
Crossover
Gain
Margin
54
40
26
12
–2
–16
–30
–44
–58
–72
–86
–100
96
82
68
166
152
138
124
110
f – Frequency – Hz
180
10
100
103
104
105
106
20 Log (Loop-Gain)
180 + Phase
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