參數(shù)資料
型號(hào)： TPS65251RHAT
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(yè)數(shù)： 11/31頁(yè)
文件大?。?/td> 1827K
代理商： TPS65251RHAT
T
= T + P
HOT_SPOT
A
DIS
JA
q
www.ti.com
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 160°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds thermal trip
threshold. Once the die temperature decreases below 140°C, the device reinitiates the power up sequence. The
thermal shutdown hysteresis is 20°C.
Power Dissipation
The total power dissipation inside TPS65251 should not to exceed the maximum allowable junction temperature
of 125°C. The maximum allowable power dissipation is a function of the thermal resistance of the package (RJA)
and ambient temperature.
To calculate the temperature inside the device under continuous loading use the following procedure.
1. Define the set voltage for each converter.
2. Define the continuous loading on each converter. Make sure do not exceed the converter maximum loading.
3. Determine from the graphs below the expected losses (Y axis) in watts per converter inside the device. The
losses depend on the input supply, the selected switching frequency, the output voltage and the converter
chosen.
4. To calculate the maximum temperature inside the IC use the following formula:
(6)
Where:
TA is the ambient temperature
PDIS is the sum of losses in all converters
qJA is the junction to ambient thermal impedance of the device and it is heavily dependant on board layout
BUCK 1 LOSSES (W)
vs
OUTPUT CURRENT
VIN = 12 V, fSW = 500 kHz
VIN = 12 V, fSW = 1.1 MHz
VO (From Top to Bottom) = 5 V , 3.3 V, 2.5 V, 1.8 V, 1.2 V
Figure 26.
Figure 27.
Copyright 2010–2011, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65251
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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(píng)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(fēng)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(fēng)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(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS65253RHDR 功能描述:PMIC 解決方案 4.5V-16Vin/2 Buck Converters RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
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