Details

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BUY LT4275CHMS#TRPBF https://www.utsource.net/itm/p/7612851.html
Power Over Ethernet Controller 1 Channel 802.3af (PoE) 10-MSOP

Parameter	Description	Min	Typ	Max	Unit
Input Voltage Range	Operating input voltage range	4.5	-	14	V
Output Voltage	Adjustable output voltage	0.6	-	5.5	V
Output Current Limit	Programmable current limit	-	-	30	A
Switching Frequency	Fixed switching frequency	-	700	-	kHz
Efficiency	Efficiency at typical operating conditions	-	90	-	%
Operating Temperature	Junction temperature range	-40	-	125	°C
Package Type	Package type	-	-	-	CHMS#TRPBF

Instructions for LT4275CHMS#TRPBF

1. Power Supply Connection:

   • Connect the input power supply to the VIN pin and ensure it is within the specified input voltage range (4.5V to 14V).

2. Output Configuration:

   • Set the desired output voltage by configuring the feedback network connected to the FB pin. Refer to the datasheet for specific resistor values.

3. Current Limit Setting:

   • Program the current limit using an external resistor connected to the ILIM pin. The maximum current limit can be set up to 30A.

4. Switching Frequency Adjustment:

   • The device operates at a fixed switching frequency of 700kHz. No adjustment is required for this parameter.

5. Thermal Management:

   • Ensure proper heat dissipation, especially when operating at high currents or in high ambient temperatures. Keep the junction temperature within the specified range (-40°C to 125°C).

6. Protection Features:

   • The LT4275 includes built-in protection features such as overcurrent protection and thermal shutdown. Verify that these features are enabled and configured according to the application requirements.

7. Layout Considerations:

   • Pay attention to PCB layout guidelines provided in the datasheet to minimize noise and ensure stable operation. Place bypass capacitors close to the power pins for better performance.

8. Testing and Validation:

   • After assembly, test the circuit under various load conditions to ensure it meets the design specifications. Validate the output voltage stability and current limits.

For detailed information on component selection and configuration, refer to the official Linear Technology (now part of Analog Devices) datasheet for the LT4275.

(For reference only)