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參數(shù)資料
| 型號： | TPS65251RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數(shù)： | 7/31頁 |
| 文件大?。?/td> | 1827K |
| 代理商： | TPS65251RHAR |
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T
ms
V
ss
REF
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-
I
A
ss
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0.8
2
1
0.8
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V
R
V
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-
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FB
0.8V
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-
TPS65251
R1
R2
www.ti.com
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
Soft Start Time
The device has an internal pull-up current source of 5 A that charges an external slow start capacitor to
implement a slow start time. Equation 2 shows how to select a slow start capacitor based on an expected slow
start time. The voltage reference (VREF) is 0.8 V and the slow start charge current (Iss) is 5 A. The soft start
circuit requires 1 nF per 200 S to be connected at the SS pin. A 1-ms soft-start time is implemented for all
converters fitting 4.7 nF to the relevant pins.
(2)
Adjusting the Output Voltage
The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use 1%
tolerance or better divider resistors. In order to improve efficiency at light load, start with 40.2 k
for the R1
resistor and use the Equation 3 to calculate R2.
(3)
Figure 22. Voltage Divider Circuit
Input Capacitor
Use 10-F X7R/X5R ceramic capacitors at the input of the converter inputs. These capacitors should be
connected as close as physically possible to the input pins of the converters.
Bootstrap Capacitor
The device has three integrated boot regulators and requires a small ceramic capacitor between the BST and LX
pin to provide the gate drive voltage for the high side MOSFET. The value of the ceramic capacitor should be
0.047 F. A ceramic capacitor with an X7R or X5R grade dielectric is recommended because of the stable
characteristics over temperature and voltage.
Error Amplifier
The device has a transconductance error amplifier. The transconductance of the error amplifier is 130 A/V
during normal operation. The frequency compensation network is connected between the COMP pin and ground.
Copyright 2010–2011, Texas Instruments Incorporated
15
Product Folder Link(s): TPS65251
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| TPS65251RHAT | 功能描述:PMIC 解決方案 PMU with 3 DC/DC Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252EVM | 功能描述:電源管理IC開發(fā)工具 TPS65252 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65252RHDR | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252RHDT | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65253EVM | 功能描述:電源管理IC開發(fā)工具 TPS65253 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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