參數資料
型號: TPS5102IDBT
英文描述: Analog IC
中文描述: 模擬IC
文件頁數: 18/31頁
文件大?。?/td> 1083K
代理商: TPS5102IDBT
TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER
SLVS239 - SEPTEMBER 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
loop-gain compensation (continued)
To achieve fast transient response and the better output voltage regulation, a compensation circuit is added to
improve the feedback control. The whole system is shown:
PWM
Power
Stage
Compensation
Vref
The typical compensation circuit used as an option in the EVM design is a part of the output feedback circuit.
The circuitry is displayed below:
_
+
R4
C3
C2
R2
R1
C1
R3
Vref
To PWM
This circuit is composed of one integrator, two poles, and two zeros:
Assuming R1 << R2 and C2 << C3, the equation is:
Comp
(1
sC3R4)
(1
sC2R2)
sC1R1)
sC3R2(1
sC2R4) (1
Therefore,
Pole1
1
2 C1R1
Zero1
1
2 C2R2
Pole2
1
2 C2R4
Zero2
1
2 C3R4
Integrator
1
2 C3R2
A simplified version used in the EVM design is exhibited below:
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