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| 型號： | TPS40050PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大小： | 648K |
| 代理商： | TPS40050PWPRG4 |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
26
DESIGN EXAMPLE
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 (15). For this
design,
I
LIM u
360
mF
3.3 V
1ms
) 8.0 A + 9.2 A
For this design, set ILIM for 11.0 ADC minimum. From equation (16), 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.
R
ILIM +
12.6 A
0.0104
W
1.12
10
mA
)
(
* 0.075)
10
mA +
11.7 k
W * 7.5 kW + 4.2 kW ^ 4.22 kW
12. Calculate loop compensation values
Calculate the DC modulator gain (AMOD) from equation (19)
A
MOD +
10
2
+ 5.0
A
MOD(dB) + 20
log (5)
+ 14 dB
Calculate the output filter L-CO poles and CO ESR zeros from (21) and (22)
f
LC +
1
2
p L
C
O
+
1
2
p 2.9 mH
360
mF
+ 4.93 kHz
and
f
Z +
1
2
p
ESR
C
O
+
1
2
p
0.006
360
mF +
73.7 kHz
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 4.93kHz.
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 (27).
A
MOD(f) + AMOD
f
LC
f
C
2
+ 5
4.93 kHz
20 kHz
2
+ 0.304
And also from equation (27).
G
+
1
A
MOD(f)
+ 1
0.304
+ 3.29
Choose R1 = 100 k
(68)
(69)
(70)
(71)
(72)
(73)
(74)
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