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參數資料
| 型號： | TPS40054QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數： | 18/28頁 |
| 文件大?。?/td> | 571K |
| 代理商： | TPS40054QPWPRQ1 |
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C
O +
2.9 m
(8 A)
2
* (1 A)
2
(3.3)
2
* (3.0)
2
+ 97 mF
(65)
33 mV + 3.2 A ESR )
1
8
73 mF
300 kHz
(66)
ESR + 10.3 mW * 3.33 mW + 6.97 mW
(67)
C
SS +
2.3 mA
0.7 V
1 ms + 3.29 nF + 3300 pF
(68)
I
LIM u
360 mF
3.3 V
1 ms
) 8.0 A + 9.2 A
(69)
R
ILIM +
12.6 A
0.0104W
8.6 mA
)
(* 0.02)
8.6 mA
+ 15.2 kW * 2.3 kW + 12.9 kW ^ 13 kW
(70)
A
MOD +
10
2
+ 5.0
A
MOD(dB) + 20
log (5) + 14 dB
(71)
f
LC +
1
2p L
C
O
+
1
2p 2.9 mH
360 mF
+ 4.93 kHz
(72)
f
Z +
1
2p
ESR
C
O
+
1
2p
0.006
360 mF
+ 73.7 kHz
(73)
A
MOD(f) + AMOD
f
LC
f
C
2
+ 5
4.93 kHz
20 kHz
2
+ 0.304
(74)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
DESIGN EXAMPLE (continued)
Using Equation 66, we can calculate the ESR required to meet the output ripple requirements.
For this design example, two Panasonic SP EEFUEOJ1B1R capacitors, (6.3 V, 180 F, 12 m
) are used.
10. Calculate the soft-start capacitor CSS)
This design requires a soft-start time (tSTART) of 1 ms. CSS can be calculated on Equation 68
11. Calculate the current limit resistor RILIM)
The current limit set point depends on tSTART, VO, CO, and ILOAD at start-up as shown in Equation 69. For this
design,
For this design, set ILIM for 11 ADC minimum. From Equation 70, with IOC equal to the dc-output surge current
plus one-half the ripple current of 3.2 A and RDS(on) is increased 30% (1.3 × 0.008) to allow for MOSFET heating.
12. Calculate loop compensation values
Calculate the dc modulator gain (AM OD) from Equation 71
Calculate the output filter L-CO poles and CO ESR zeros from Equation 72 and Equation 73
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.
Select the double pole location for the Type III compensation network at the output capacitor ESR zero at
73.7 kHz.
The amplifier gain at the crossover frequency of 20 kHz is determined by the reciprocal of the modulator gain
AMOD at the crossover frequency from Equation 74.
And also from Equation 75.
25
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