Details

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BUY TPS51275B https://www.utsource.net/itm/p/8519824.html

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Input Voltage	VIN		4.5		18	V
Output Voltage	VOUT		0.6		5.5	V
Switching Frequency	fSW			2.1		MHz
Efficiency	η	VIN = 12V, VOUT = 5V, IOUT = 5A		93		%
Load Regulation		VIN = 12V, VOUT = 5V, IOUT = 0 to 5A		±0.5		%
Line Regulation		VIN = 4.5V to 18V, VOUT = 5V		±0.5		%
Dropout Voltage	VDROPOUT	IOUT = 5A		0.5		V
Quiescent Current	IQ	No load		0.5		mA
Short-Circuit Current	ISCC	VIN = 12V, VOUT shorted		6		A
Thermal Shutdown	TSD			160		°C

Instructions for Use

1. Input Voltage (VIN):

   • Ensure the input voltage is within the specified range of 4.5V to 18V.

2. Output Voltage (VOUT):

   • Set the output voltage using the feedback resistor network. The adjustable range is from 0.6V to 5.5V.

3. Switching Frequency (fSW):

   • The switching frequency is typically set at 2.1 MHz. Adjustments may be necessary based on specific application requirements.

4. Efficiency:

   • For optimal efficiency, operate within recommended conditions such as VIN = 12V, VOUT = 5V, and IOUT = 5A where efficiency can reach up to 93%.

5. Load and Line Regulation:

   • Both load and line regulation are tightly controlled to within ±0.5%. This ensures stable output under varying input voltages and load currents.

6. Dropout Voltage:

   • Monitor the dropout voltage, especially at higher load currents. At 5A, expect a typical dropout voltage of around 0.5V.

7. Quiescent Current:

   • With no load, the quiescent current should be about 0.5mA. This parameter is crucial for low-power applications.

8. Short-Circuit Protection:

   • The device has built-in protection limiting the short-circuit current to approximately 6A when VIN = 12V and VOUT is shorted.

9. Thermal Shutdown:

   • The device will enter thermal shutdown if the temperature exceeds 160°C. Ensure proper heat dissipation to prevent this.

For detailed design considerations and more specific parameters, refer to the official datasheet provided by the manufacturer.

(For reference only)