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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 17/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
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(
) (
)
KFF
IN(min)
T
R
V
3.48
58.14
R
1340
72.8 k
use 71.5 k
=
-
+
=
W \
W
(61)
9. Calculating the output capacitance (CO)
C
O +
2.9 m
(8 A)
2
* (1 A)
2
(3.3)
2
* (3.0)
2
+ 97 mF
(62)
1
33 mV
3.2 A ESR
8
97 F
300 kHz
=
+
÷
÷
÷
m
è
è
(63)
ESR
10.3 m
- 4.3 m
6.0 m
=
W
W =
W
(64)
10. Calculate the soft-start capacitor (CSS/SD)
2.35 A
C
1 ms - 3.36 nF
3300 pF
SS / SD
0.7 V
m
=
=
÷
è
(65)
11. Calculate the current limit resistor (RILIM)
I
LIM u
360 mF
3.3 V
1 ms
) 8.0 A + 9.2 A
(66)
3
ILIM
6
14
0.0104
0.070
42.86
10
R
12.98 k
13 k
1.12
8.5
10
8.5
10
-
-
=
+
=
W @
W
(67)
12. Calculate loop compensation values
A
MOD +
10
2 +
5.0
A
MOD(dB) + 20
log (5) + 14 dB
(68)
f
LC +
1
2p L
C
O
+
1
2p 2.9 mH
360 mF
+ 4.93 kHz
(69)
f
Z +
1
2p
ESR
C
O
+
1
2p
0.006
360 mF +
73.7 kHz
(70)
SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008 ...................................................................................................................................... www.ti.com
In this example the output capacitance is determined by the load response requirement of
ΔV = 0.3 V for a 1-A
Using Equation 6 calculate the ESR required to meet the output ripple requirements.
For this design example two (2) Panasonic SP EEFUEOJ1B1R capacitors, (6.3 V, 180 F, 12 m
) are used.
This design requires a soft-start time (tSTART) of 1 ms. CSS/SD can be calculated using Equation 13:
The current limit set point depends on tSTART, VO,CO and ILOAD at start-up as shown in Equation 14. For this
design,
For this design, add ILIM (9.2 A) to one-half the ripple current (1.6 A) and increase this value by 30% to allow for
tolerances. This yields a overcurrent setpoint (IOC) of 14 A. RDS(on) is increased 30% (1.3 × 0.008) to allow for
and
Select the close-loop 0 dB crossover frequency, fC. For this example fC = 20 kHz.
Select the double zero location for the Type III compensation network at the output filter double pole at 4.93 kHz.
24
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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