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| 型号： | TPS61085DGKRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 2/25页 |
| 文件大小： | 781K |
| 代理商： | TPS61085DGKRG4 |
2
IN
S
IN
S
V
V -V
L =
×
V
Iout_max×f
0.35
h
÷
÷
÷
è
è
è
(1)
Rectifier Diode Selection
avg
out
I
=
SLVS859 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
Typically, it is recommended that the inductor current ripple is below 20% of the average inductor current. The
following equation can therefore be used to calculate the inductor value:
Table 1. Inductor Selection
L
COMPONENT
SIZE
DCR TYP
SUPPLIER
Isat (A)
CODE
(
H)
(L×W×H mm)
(m
)
1.2 MHz
3.3
Sumida
CDH38D09
4 x 4 x 1
240
1.25
4.7
Sumida
CDPH36D13
5 × 5 × 1.5
155
1.36
3.3
Sumida
CDPH4D19F
5.2 x 5.2 x 2
33
1.5
3.3
Sumida
CDRH6D12
6.7 x 6.7 x 1.5
62
2.2
4.7
Würth Elektronik
7447785004
5.9 × 6.2 × 3.3
60
2.5
5
Coilcraft
MSS7341
7.3 × 7.3 × 4.1
24
2.9
650 kHz
6.8
Sumida
CDP14D19
5.2 x 5.2 x 2
50
1
10
Coilcraft
LPS4414
4.3 × 4.3 × 1.4
380
1.2
6.8
Sumida
CDRH6D12/LD
6.7 x 6.7 x 1.5
95
1.25
10
Sumida
CDR6D23
5 × 5 × 2.4
133
1.75
10
Würth Elektronik
744778910
7.3 × 7.3 × 3.2
51
2.2
6.8
Sumida
CDRH6D26HP
7 x 7 x 2.8
52
2.9
To achieve high efficiency, a Schottky type should be used for the rectifier diode. The reverse voltage rating
should be higher than the maximum output voltage of the converter. The averaged rectified forward current Iavg,
the Schottky diode needs to be rated for, is equal to the output current Iout:
Usually a Schottky diode with 2 A maximum average rectified forward current rating is sufficient for most
applications. The Schottky rectifier can be selected with lower forward current capability depending on the output
current Iout but has to be able to dissipate the power. The dissipated power is the average rectified forward
current times the diode forward voltage.
PD = Iavg × Vforward
Typically the diode should be able to dissipate around 500mW depending on the load current and forward
voltage.
Table 2. Rectifier Diode Selection
CURRENT
COMPONENT
PACKAGE
Vr
Vforward / Iavg
SUPPLIER
RATING Iavg
CODE
TYPE
750 mA
20 V
0.425 V /
Fairchild Semiconductor
FYV0704S
SOT 23
750 mA
1 A
20 V
0.39 V / 1 A
NXP
PMEG2010AEH
SOD 123
1 A
20 V
0.52 V / 1 A
Vishay Semiconductor
B120
SMA
1 A
20 V
0.5 V / 1 A
Vishay Semiconductor
SS12
SMA
1 A
20 V
0.44 V / 1 A
Vishay Semiconductor
MSS1P2L
-SMP (Low
Profile)
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS61085
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