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參數(shù)資料
| 型號(hào)： | TPS54010PWPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁(yè)數(shù)： | 3/29頁(yè) |
| 文件大小： | 984K |
| 代理商： | TPS54010PWPG4 |
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I
CIN +
I
OUT(MAX)
2
(3)
SWITCHING FREQUENCY
OUTPUT FILTER COMPONENTS
R4(kW) +
500 kHz
s(kHz)
100 kW
(1)
Inductor Selection
INPUT CAPACITORS
L
MIN +
V
OUT
V
in(MAX) *
V
OUT
V
IN(MAX)
K
IND
I
OUT
Fsw
(4)
DVPVIN +
I
OUT(MAX)
0.25
C
BULK
sw )
I
OUT(MAX)
ESR
MAX
I
L(RMS) +
I2
OUT(MAX) )
1
12
V
OUT
V
in(MAX) *
V
OUT
V
IN(MAX)
L
OUT
Fsw
0.8
2
TPS54010
SLVS509B – MAY 2004 – REVISED JUNE 2005
(continued)
DESIGN PARAMETER
EXAMPLE VALUE
Operating frequency
700 kHz
In this case, the input ripple voltage would be 155 mV
and the RMS ripple current would be 7 A. The
maximum voltage across the input capacitors would
be Vin max plus delta Vin/2. The chosen bulk
The switching frequency can be set to either one of
capacitor, a Sanyo POSCAP 6TPD330M is rated for
two internally programmed frequencies or set to a
6.3 V and 4.4 A of ripple current; two bypass
externally programmed frequency. With the RT pin
capacitors, TDK C3225X5R1C106M are each rated
open, setting the SYNC pin at or above 2.5 V selects
for 16 V, and the ripple current capacity is greater
550-kHz operation, whereas grounding or leaving the
than 3 A at the operating frequency of 700 kHz. Total
SYNC pin open selects 350-kHz operation. For this
ripple current handling is in excess of 10.4 A. It is
design, the switching frequency is externally pro-
important that the maximum ratings for voltage and
grammed using the RT pin. By connecting a resistor
current are not exceeded under any circumstance.
(R4) from RT to AGND, any frequency in the range of
250 to 700 kHz can be set. Use Equation 1 to
determine the proper value of RT.
Two components need to be selected for the output
filter, L1 and C2. Because the TPS54010 is an
externally compensated device, a wide range of filter
In this example circuit, R4 is calculated to be 71.5 k
component types and values can be supported.
and the switching frequency is set at 700 kHz.
To calculate the minimum value of the output induc-
The TPS54010 requires an input de-coupling capaci-
tor, use Equation 4
tor and, depending on the application, a bulk input
capacitor. The minimum value for the de-coupling
capacitor, C9, is 10 F. A high-quality ceramic type
X5R or X7R is recommended. The voltage rating
should be greater than the maximum input voltage.
Additionally, some bulk capacitance may be needed,
KIND is a coefficient that represents the amount of
especially if the TPS54010 circuit is not located within
inductor ripple current relative to the maximum output
about 2 inches from the input voltage source. The
current. For designs using low ESR output capacitors
value for this capacitor is not critical but it also should
such as ceramics, use KIND = 0.3. When using higher
be rated to handle the maximum input voltage includ-
ESR output capacitors, KIND = 0.2 yields better
ing ripple voltage, and should filter the output so that
results.
input ripple voltage is acceptable.
For this design example, use KIND = 0.2 to keep the
This input ripple voltage can be approximated by
inductor ripple current small. The minimum inductor
Equation 2:
value is calculated to be 0.44 H.
For the output filter inductor, it is important that the
RMS current and saturation current ratings not be
exceeded. The RMS inductor current can be found
(2)
from Equation 5:
Where IOUT(MAX) is the maximum load current.
The TPS54010 requires an input de-coupling capaci-
tor and, depending on the application, a bulk input
capacitor.
sw is the switching frequency, C(BULK) is
(5)
the bulk capacitor value and ESRMAX is the maximum
series resistance of the bulk capacitor.
and the peak inductor current can be found from
Equation 6
The maximum RMS ripple current also needs to be
checked. For worst-case conditions, this can be
approximated by Equation 3:
11
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| TPS54010PWPR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.2V-4.0V 14A Otp Buck PWM Switch RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54010PWPRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.2V-4.0V 14A Otp Buck PWM Switch RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5401DGQ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.5V-42Vin,0.5A Step Down SWIFT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5401DGQR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5V-42Vin,0.5A Step Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| TPS5401DGQT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5V-42Vin,0.5A Step Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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