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| 型号： | TPS5102IDBTRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封装： | GREEN, PLASTIC, TSSOP-30 |
| 文件页数： | 8/34页 |
| 文件大小： | 1182K |
| 代理商： | TPS5102IDBTRG4 |
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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
+ DI
12
Where
Io(rms) is the maximum RMS current in the output capacitor (A);
I is 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
+ Io2
D
(1
–D)
) 1
12
D
Iripple2
Where
Ii(rms) is the input RMS current in the input capacitor (A); Io is the output current (A); Iripple is the
peak-to-peak output inductor ripple current;
D is 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
Csoft is the soft-start capacitance (F) (C9 or C13 in EVM design); Tsoft is the start-up time (S).
Example: Tsoft = 5 mS, so Csoft = 0.01
F.
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