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| 型号： | TPS40077PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 18/43页 |
| 文件大小： | 847K |
| 代理商： | TPS40077PWPRG4 |
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f Frequency Hz
0
5
10
15
20
25
30
35
40
45
50
Gain
dB
Phase
°
Gain
Phase
100
1k
10k
1M
100k
200
180
160
140
120
100
80
40
0
G027
20
60
Component Selection
LOUT +
V
OUT
V
IN(max)
V
IN(max) * VOUT
fs
I
RIPPLE
(18)
I
LOUT_RMS +
I
OUT
2
)
I
RIPPLE
2
12
+ 10.02 A
(19)
I
PK + IOUT )
I
RIPPLE
2
+ 11.03 A
(20)
www.ti.com ..................................................................................................................................................... SLUS714D – JANUARY 2007 – REVISED APRIL 2009
Figure 30. Bode Plot Showing 57° Phase Margin at Crossover Frequency of 54 kHz
Power Train Components
Output Inductor, LOUT
The output inductor is one of the most important components to select. It stores the energy necessary to keep
the output regulated when the switch FET is turned off. The value of the output inductor dictates the peak and
RMS currents in the converter. These currents are important when selecting other components. Equation (1) can
be used to calculate a value for LOUT for this module which operates at a switching frequency (f) of 300 kHz.
IRIPPLE is the allowable ripple in the inductor. Select IRIPPLE to be between 20% and 30% of maximum IOUT. For
this design, IRIPPLE of 2.5 A was selected. Calculated LOUT is 2.13 H. A standard inductor with value of 2.5 H
was chosen. This will reduce IRIPPLE by about 17% to 2.07 A.
This IRIPPLE value can be used calculate the rms and peak current flowing in LOUT. Note that this peak current is
also seen by the switching FET and synchronous rectifier.
The power loss from the selected inductor DCR is 357 mW. The ac core loss for this Coilcraft inductor may be
found from the Coilcraft Web site, where there is a loss calculator. The loss is 179 mW.
The inductor is selected with a saturation current higher than this current plus the current that is developed
charging the output capacitance during the soft-start interval.
Copyright 2007–2009, Texas Instruments Incorporated
25
Product Folder Link(s) :TPS40077
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