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參數資料
| 型號： | TPS5102IDBT |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數： | 19/31頁 |
| 文件大小： | 1083K |
| 代理商： | TPS5102IDBT |
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TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER
SLVS239 - SEPTEMBER 1999
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
loop-gain compensation (continued)
_
+
R4
C3
C2
R2
R3
Vref
To PWM
VO
Assuming C2 << C3, the equation is:
Comp
(1
sC3R4)
sC2R4)
sC3R2(1
There is one pole, one zero and one integrator:
Zero
1
2 C3R4
Pole
1
2 C2R4
Integrator
1
2 fC3R2
The loop-gain concept is used to design a stable and fast feedback control. The loop-gain equation is derived
by the control-to-output transfer function times the compensation:
Loop–gain
Vod
Comp
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 parameters. 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.
The crossover frequency is the point at which the gain curve touches zero. The higher this frequency, the faster
the transient response, since the transient recovery time is 1/(crossover frequency). The phase is the phase
margin. The phase margin should be at least 60 degrees to cover all changes such as temperature. The gain
margin is the gap between the gain curve and the zero when the phase curve touches zero. This margin should
be at least 20 dB to guarantee stability over all conditions.
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