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參數資料
| 型號： | TPS62303YZD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 500-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER IN CHIP SCALE PACKAGING |
| 中文描述： | 500毫安，3 MHz的同步降壓轉換器芯片級封裝 |
| 文件頁數： | 18/31頁 |
| 文件大小： | 1635K |
| 代理商： | TPS62303YZD |
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INDUCTOR SELECTION
Even though the inductor does not influence the operating frequency, the inductor value has a direct effect on the
ripple current. The selected inductor has to be rated for its dc resistance and saturation current. The inductor
ripple current (
I
L
) decreases with higher inductance and increases with higher V
I
or V
O
.
IL
VO
VI
VI
L
VO
sw
IL(MAX)
IO(MAX)
IL
2
(4)
OUTPUT CAPACITOR SELECTION
The advanced fast-response voltage mode control scheme of the TPS6230x, TPS6231x, and TPS6232x allows
the use of tiny ceramic capacitors. Ceramic capacitors with low ESR values have the lowest output voltage ripple
and are recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric
capacitors, aside from their wide variation in capacitance over temperature, become resistive at high frequencies.
VO
VO
VI
VI
L
VO
sw
1
8
CO
sw
ESR
,maximum for high VI
(5)
TPS62300, TPS62301, TPS62302
TPS62303, TPS62305, TPS62311
TPS62313, TPS62320, TPS62321
SLVS528B–JULY 2004–REVISED JUNE 2005
with: f
SW
= switching frequency (3 MHz typical)
L = inductor value
I
L
= peak-to-peak inductor ripple current
I
L(MAX)
= maximum inductor current
Normally, it is advisable to operate with a ripple of less than 30% of the average output current. Accepting larger
values of ripple current allows the use of low inductances, but results in higher output voltage ripple, greater core
losses, and lower output current capability.
The total losses of the coil consist of both the losses in the DC resistance (R
(DC)
) and the following
frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
The following inductor series from different suppliers have been used with the TPS6230x, TPS6231x, and
TPS6232x converters.
Table 2. List of Inductors
MANUFACTURER
FDK
SERIES
MIPW3226
LQ CB2016
LQ CB2012
LQ CBL2012
VLF3010AT
WE-TPC XS
LPO3010
DIMENSIONS
3.2 x 2.6 x 1 = 8.32 mm
3
2 x 1.6 x 1.6 = 5.12 mm
3
2 x 1.2 x 1.2 = 2.88 mm
3
2 x 1.2 x 1 = 2.40 mm
3
2.8 x 2.6 x 1 = 7.28 mm
3
3.3 x 3.5 x 0.95 = 10.97 mm
3
3.3 x 3.3 x 1 = 10.89 mm
3
Taiyo Yuden
TDK
Wuerth Elektronik
Coilcraft
At nominal load current, the device operates in PWM mode and the overall output voltage ripple is the sum of the
voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the
output capacitor:
At light loads, the device operates in power-save mode and the output voltage ripple is independent of the output
capacitor value. The output voltage ripple is set by the internal comparator thresholds and propagation delays.
The typical output voltage ripple is 1.5% of the nominal output voltage V
O
.
18
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS62303YZDR | 功能描述:直流/直流開關調節器 1.8V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62303YZDT | 功能描述:直流/直流開關調節器 1.8V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62304DRCR | 功能描述:直流/直流開關調節器 1.2V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62304DRCRG4 | 功能描述:直流/直流開關調節器 1.2V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62304YZDR | 功能描述:直流/直流開關調節器 1.2V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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