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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： | 21/47頁 |
| 文件大小： | 1375K |
| 代理商： | TPS40211DRCTG4 |
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(
)
2
L
Lrms
P
I
DCR
OUT
(BR)R(min)
OUT
V
1.25 V
1.25 24 V
30 V
0.8
=
=
=
(
)
(
)
D avg
OUT m ax
I
2 A
=
(
)
(
)
D peak
L peak
I
6.57 A
=
D(max)
FD
D(avg)
P
V
I
0.5 V 2 A
1W
=
=
OUT
OUT(ripple)
SW
I
D
1
2 A 0.673
1
C
8
36 F
V
500mV
600kHz
=
=
=
m
÷
è
f
(
)
(
)
OUT ripple
OUT
L peak
V
7
500mV
ESR
96m
8
I
8
6.57 A
2 A
=
=
=
W
-
(
)
RIPPLE
IN
SW
IN ripple
I
1.02 A
C
7.1 F
4 V
4 60mV 600kHz
>
=
m
f
(
)
IN ripple
RIPPLE
V
60mV
ESR
29m
2 I
2 1.02 A
<
=
W
SLUS772D – MARCH 2008 – REVISED APRIL 2010
www.ti.com
A 10-mH inductor with a minimum RMS current rating of 6.13 A and minimum saturation current rating of 6.57 A
must be selected. A TDK RLF12560T-100M-7R5 7.5-A 10-mH inductor is selected.
This inductor power dissipation is estimated by Equation 40.
(40)
The TDK RLF12560T-100M-7R5 12.4-m
DCR dissipates 466 mW of power.
Rectifier Diode Selection
A low forward voltage drop schottky diode is used as a rectifier diode to reduce its power dissipation and improve
efficiency. Using 80% derating on VOUT for ringing on the switch node, the rectifier diode minimum reverse
break-down voltage is given by Equation 41.
(41)
The diode must have reverse breakdown voltage greater than 30 V. The rectifier diode peak and average
currents are estimated by Equation 42 and Equation 43.
(42)
(43)
The power dissipation in the diode is estimated by Equation 44.
(44)
For this design, the maximum power dissipation is estimated as 1 W. Reviewing 30-V and 40-V schottky diodes,
the MBRS340T3, 40-V, 3-A diode in an SMC package is selected. This diode has a forward voltage drop of
0.48-V at 6-A, so the conduction power dissipation is approximately 960 mW, less than half its rated power
dissipation.
Output Capacitor Selection
Output capacitors must be selected to meet the required output ripple and transient specifications.
(45)
(46)
A Panasonic EEEFC1V330P 35V 33-mF, 120-m bulk capacitor and a 6.8-mF ceramic capacitor are selected to
provide the required capacitance and ESR at the switching frequency. The combined capacitance of 39.8 mF and
ESR of 60 m
are used in compensation calculations.
Input Capacitor Selection
Since a boost converter has continuous input current, the input capacitor senses only the inductor ripple current.
The input capacitor value can be calculated by Equation 47 and Equation 48 .
(47)
(48)
For this design to meet a maximum input ripple of 60 mV (1/2% of VIN nominal), a minimum 7.1-mF input
capacitor with ESR less than 29 m
is needed. A 10-mF X7R ceramic capacitor is selected.
28
Copyright 2008–2010, Texas Instruments Incorporated
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