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參數資料
| 型號： | TPS40211DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數： | 24/47頁 |
| 文件大小： | 1375K |
| 代理商： | TPS40211DRCTG4 |
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FB
BIAS
OUT
FB
V
R
0.700 V
51.1k
R
1.53 k
V
24 V
0.700 V
W
=
W
-
(
)
(
)
OUT
OUT max
OUT min
V
24 V
R
240
I
0.1A
=
W
(
) (
) (
)
(
)
SW
OUT
M
2
ISNS
SW
600kHz
0.13
L
0.13
10 H
R
240
A
g
19.2
V
12m
120 12m
10 H 600kHz
R
120 R
L
m
W
=
W
W +
m
+
f
(
)
(
)
(
)
(
)
(
) (
)
f
2
ESR
OUT
2
OUT
ESR
OUT
1
2
f R
C
Z
( )
R
1
R
2 R
R
2
f C
+
p
=
+
+
+
p
( )
(
)
(
)
(
)
(
)
(
) (
)
2
f
OUT
L
2
1
2
30 kHz
60 m
39.8 F
Z
240
0.146
1
240
2
240
60 m
2
30 kHz
39.8 F
+
p
W
m
=
W
=
W
+
W
+
W
W +
W
p
m
(
)
CO
M
OUT
CO
A
K
g
Z
19.2
0.146
2.80
V
=
=
W =
f
COMP
CO
1
K
0.357
K
2.80
=
COMP
CO
R7
51.1k
R4
R7
K
18.2k
K
2.80
W
=
=
W
SLUS772D – MARCH 2008 – REVISED APRIL 2010
www.ti.com
Feedback Divider Resistors
The primary feedback divider resistor (RFB) from VOUT to FB should be selected between 10-k and 100-k to
maintain a balance between power dissipation and noise sensitivity. For a 24-V output a high feedback
resistance is desirable to limit power dissipation so RFB = 51.1 k is selected.
(57)
RBIAS = 1.50 k is selected.
Error Amplifier Compensation
While current mode control typically only requires Type II compensation, it is desirable to layout for Type III
compensation to increase flexibility during design and development.
Current mode control boost converters have higher gain with higher output impedance, so it is necessary to
calculate the control loop gain at the maximum output impedance, estimated by Equation 58.
(58)
The transconductance of the TPS40210 current mode control can be estimated by Equation 59.
(59)
(60)
(61)
At the desired crossover frequency (fL) of 30 kHz, ZOUT becomes 0.146Ω.
The modulator gain at the desired cross-over can be estimated by Equation 62.
(62)
The feedback compensation network needs to be designed to provide an inverse gain at the cross-over
frequency for unity loop gain. This sets the compensation mid-band gain at a value calculated in Equation 63.
(63)
(64)
R4 = 18.7 k
selected.
Place the zero at 1/10th of the desired cross-over frequency.
30
Copyright 2008–2010, Texas Instruments Incorporated
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參數描述 |
|---|---|
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