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參數(shù)資料
| 型號： | TPS40054PWPRG4 |
| 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(shù)： | 4/35頁 |
| 文件大?。?/td> | 866K |
| 代理商： | TPS40054PWPRG4 |
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CALCULATING THE OUTPUT CAPACITANCE
DV + DI ESR )
1
8
C
O
f
SW
V
P*P
(6)
E
L +
1
2
L
I2 (Joules)
(7)
I2 +
I
OH
2
* IOL
2
(Amperes)
2
(8)
E
C +
1
2
C
V2 (Joules)
(9)
V2 +
V
f
2
* Vi
2
Volts2
(10)
C
O +
L
I
OH
2
* IOL
2
V
f
2
* Vi
2
(Farads)
(11)
SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008 ...................................................................................................................................... www.ti.com
The output capacitance depends on the output ripple voltage requirement, output ripple current, as well as any
output voltage deviation requirement during a load transient.
The output ripple voltage is a function of both the output capacitance and capacitor ESR. The worst-case output
ripple is described in Equation 6.
The output ripple voltage is typically between 90% and 95% due to the ESR component.
The output capacitance requirement typically increases in the presence of a load transient requirement. During a
step load, the output capacitance must provide energy to the load (light to heavy load step) or absorb excess
inductor energy (heavy to light load step) while maintaining the output voltage within acceptable limits. The
amount of capacitance depends on the magnitude of the load step, the speed of the loop and the size of the
inductor.
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
where
I
OH is the output current under heavy load conditions
I
OL is the output current under light load conditions
Energy in the capacitor is described in Equation 9.
where
V
f is the final peak capacitor voltage
V
i is the initial capacitor voltage
Substituting Equation 8 into Equation 7, then substituting Equation 10 into Equation 9, then setting Equation 9
12
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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