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参数资料
| 型号： | TPS65250RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件页数： | 15/38页 |
| 文件大小： | 1782K |
| 代理商： | TPS65250RHAR |
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T
= T + P
HOT_SPOT
A
DIS
JA
q
SLVSAA3B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
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 TPS65250 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 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:
(10)
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
Figure 35. Buck 1
Figure 36. Buck 1
VIN = 12 V, fSW = 500 kHz
VIN = 12 V, fSW = 1.1 MHz
22
Copyright 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65250
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