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參數資料
| 型號： | TPS54226PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 封裝： | PACKAGE-14 |
| 文件頁數： | 5/20頁 |
| 文件大?。?/td> | 501K |
| 代理商： | TPS54226PW |
I
=
Lo(RMS)
√
I +
O
2
1
12
Ilp-p
2
C
O >
1
8
f
SW
1
V
O(ripple)
I
(ripple)
R
ESR
(
)
-
R
ESR
<
V
O(ripple)
I
l(ripple)
I
=
CO(RMS)
V
OUT
(
)
V-V
IN
OUT
V
IN
L
O
f
SW
√12
V
=
OUT
0.765
(1+ R1
R2
)
V
=
V
OUT
(0.763+0.0017
)
(1+ R1
R
2
)
www.ti.com
SLVSA14B – OCTOBER 2009 – REVISED JUNE 2010
(6)
For this design example, use KIND = 0.3 and the inductor value is calculated to be 2.35 mH. For this design, a
nearest standard value was chosen: 2.2 mH. For 2.2 mH, the calculated peak current is 2.32 A and the calculated
RMS current is 2.008 A. The inductor used is a TDK SPM6530-2R2M with a peak current rating of 8.4 A and an
RMS current rating of 8.2 A.
Output Capacitor Selection
The capacitor value and ESR determines the amount of output voltage ripple. Ceramic output capacitors of at
least 20 uF total capacitance is recommended. Using Equation 7 to Equation 9, an initial estimate for the
capacitor value, ESR, and RMS current can be calculated. If the load transients are significant consider using the
load step, instead of ripple current to calculate the maximum ESR.
(7)
(8)
(9)
For this design, the minimum required capacitance is 4.8 F and maximum ESR is 49 m
Ω. Two TDK
C3216JB0J226M 22 F output capacitors are used. The maximum ESR is 12 m
Ω each. The calculated RMS
current is .185 A and each output capacitor is rated for 2 A.
Input Capacitor Selection
The TPS54226 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A ceramic capacitor over 10 mF is recommended for the decoupling capacitor. The capacitor voltage
rating needs to be greater than the maximum input voltage. In case of separate VCC and VIN, then a ceramic
capacitor over 10 mF is recommended for the VIN and also placing ceramic capacitor over 0.1 mF for the VCC is
recommended.
Bootstrap Capacitor Selection
A 0.1-mF ceramic capacitor must be connected between the VBST to SW pin for proper operation. It is
recommended to use a ceramic capacitor.
VREG5 Capacitor Selection
A 1-mF ceramic capacitor must be connected between the VREG5 to GND pin for proper operation. It is
recommended to use a ceramic capacitor.
Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use
1% tolerance or better divider resistors. Start by using Equation 10 and Equation 11 to calculate VOUT.
To improve efficiency at very light loads consider using larger value resistors, too high of resistance will be more
susceptible to noise and voltage errors from the VFB input current will be more noticeable.
For output voltage from 0.76 V to 2.5 V:
(10)
For output voltage over 2.5 V:
(11)
Copyright 2009–2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS54226
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| TPS54226PWP | 功能描述:直流/直流開關調節器 4.5-18V 2A Sync 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 |
| TPS54226PWP | 制造商:Texas Instruments 功能描述:DC/DC STEP DOWN CONVERTER IC 700kHz HT 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN DC/DC CONV, HTSSOP-14 |
| TPS54226PWPR | 功能描述:直流/直流開關調節器 4.5-18V 2A Sync 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 |
| TPS54226RGTR | 功能描述:直流/直流開關轉換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54226RGTT | 功能描述:直流/直流開關轉換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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