參數(shù)資料
型號: TPS65257RHAT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, GREEN, PLASTIC, VQFN-40
文件頁數(shù): 18/34頁
文件大小: 2100K
代理商: TPS65257RHAT
0
OVERCURRENT DETECTED
Normal operation
Overcurrent at the output
.
Alarm
is asserted after 5 ms
Normal operation is restored
.
Alarm is cleared
.
OVERCURRENT IS CLEARED
T CS_USB
USB_Vin
USB_EN
USB_Vo
USB_I
USB_nFAULT
USB_LOAD
ICS_USB
SLVSB32
– SEPTEMBER 2011
Figure 46. USB Switch
Power Dissipation
The total power dissipation inside TPS65257 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.
Copyright
2011, Texas Instruments Incorporated
25
Product Folder Link(s): TPS65257
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