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| 型號(hào)： | TPS40211DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 25/47頁 |
| 文件大?。?/td> | 1375K |
| 代理商： | TPS40211DRCTG4 |
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fL
10
C2
2837pF
2
R4
2
30kHz 18.7k
=
p
p
W
fL
1
C4
56.74pF
10
R4
10
30kHz 18.7k
=
p
p
W
1
C4
11.35pF
GBW R4
1.5MHz 18.7k
>
=
p
p
W
6
SS
C
20
T
10-
=
G
a
in
–
d
B
-80
-40
80
20
-20
40
60
-60
100
fSW – Frequency – Hz
1000
10 k
100 k
1 M
0
P
h
a
s
e
–
°
-180
-90
180
45
-45
90
135
-135
0
Phase
Gain
V
IN = 8 V
V
OUT = 24 V
I
OUT = 2 A
GDRV
(5 V/ div)
FET Vds
(20 V/ div)
T – Time – 400 ns
www.ti.com
SLUS772D – MARCH 2008 – REVISED APRIL 2010
(65)
C2 = 2200 pF selected.
Place a high-frequency pole at about 5 times the desired cross-over frequency and less than one-half the unity
gain bandwidth of the error amplifier:
(66)
(67)
C4 = 47 pF selected.
R-C Oscillator
The R-C oscillator calculation is given as shown in Equation 5 in the datasheet, substituting 100 for CT and 600
for fSW. For a 600-kHz switching frequency, a 100-pF capacitor is selected and a 262-k resistor is calculated
(261-k
selected).
Soft-Start Capacitor
Since VDD > 8V, the soft-start capacitor is selected by using Equation 68 to calculate the value.
(68)
For TSS = 12 ms, CSS = 240 nF. A 220-nF capacitor is selected.
Regulator Bypass
A regulator bypass (BP) capacitor of 1.0-mF is selected per the datasheet recommendation.
TEST DATA
GAIN AND PHASE
FET VDS and VGS VOLTAGES
vs
FREQUENCY
TIME
Figure 31.
Figure 32.
Copyright 2008–2010, Texas Instruments Incorporated
31
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