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參數資料
| 型號： | TPS5103IDBR |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關電源控制器 |
| 文件頁數： | 16/31頁 |
| 文件大小： | 1083K |
| 代理商： | TPS5103IDBR |
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TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER
SLVS239 - SEPTEMBER 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output capacitor RMS current
Assuming the inductor ripple current totally goes through the output capacitor to ground, the RMS current in the
output capacitor can be calculated as:
Iorms
I
12
Where Io(rms)is the maximum RMS current in the output capacitor (A);
Iis the peak-to-peak inductor ripple
current (A).
Example:
I = 2 A, so Io(rms) = 0.58 A
input capacitor RMS current
Assuming the input ripple current totally goes into the input capacitor to the power ground, the RMS current in
the input capacitor can be calculated as:
Iirms
Io
2
D
(1–D)
1
Iripple
2
Where Ii(rms) is the input RMS current in the input capacitor (A); Iois the output current (A); Iripple is the
peak-to-peak output inductor ripple current; Dis the duty cycle. From the equation, it can be seen that the
highest input RMS current usually occurs at the lowest input voltage, so it is the worst case design for input
capacitor ripple current.
Example: Io = 5 A; D = 0.36; Iripple = 2 A,
Then, Ii(rms) = 2.42 A
soft-start
The soft-start timing can be adjusted by selecting the soft-start capacitor value. The equation is
C
soft
2
T
soft
Where C
soft
is the soft-start capacitance (
μ
F) (C9 or C13 in EVM design); T
soft
is the start-up time (S).
Example: Tsoft = 5 mS, so Csoft = 0.01
μ
F.
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