參數資料
型號: TPS40052PWP
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: GREEN, PLASTIC, HTSSOP-16
文件頁數: 2/33頁
文件大?。?/td> 753K
代理商: TPS40052PWP
TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
10
www.ti.com
APPLICATION INFORMATION
Stepping the load from a heavy load to a light load results in an output overshoot. Excess energy stored in the
inductor must be absorbed by the output capacitance. The energy stored in the inductor is described in
equation (4).
E
L +
1
2
L
I2 (Joules)
where:
I2
+ I
OH
2
* I
OL
2
(Amperes)
2
where:
D IOH is the output current under heavy load conditions
D IOL is the output current under light load conditions
Energy in the capacitor is described in equation (6).
E
C +
1
2
C
V2 (Joules)
where:
V2
+ V
f
2
* V
i
2
Volts2
where:
D Vf is the final peak capacitor voltage
D Vi is the initial capacitor voltage
Substituting equation (5) into equation (4), then substituting equation (7) into equation (6), then setting equation
(6) equal to equation (4), and then solving for CO yields the capacitance described in equation (8).
C
O +
L
I
OH
2
* I
OL
2
V
f
2
* V
i
2
(Farads)
(4)
(5)
(6)
(7)
(8)
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