Details

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Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage Range	VIN	Continuous Operation	4.5	-	60	V
Output Voltage Range	VOUT	Adjustable	0.8	-	55	V
Switching Frequency	fSW	Default Setting	-	500	1200	kHz
Current Limit	ILIM	Typical	-	20	-	A
Efficiency	畏	Typical at 12V to 1.2V, 20A	-	95	-	%
Operating Temperature Range	Toperating	-	-40	25	125	掳C
Storage Temperature Range	Tstorage	-	-65	-	150	掳C
Package Type	-	-	-	-	-	E-8 (3x3mm)

Instructions for Use:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the specified range of 4.5V to 60V.
   • Use appropriate input capacitors to stabilize the input voltage.

2. Output Voltage (VOUT):

   • Set the output voltage using the feedback resistor network. The formula for calculating the resistors is: [ V_ = 0.8 times left(1 + fracright) ]
   • Choose R1 and R2 values to achieve the desired output voltage.

3. Switching Frequency (fSW):

   • The default switching frequency is set by an external resistor connected to the RT pin. The formula for calculating the resistor value is: [ R_T = frac{24.4 times 10^6}{f_} ]
   • Adjust the resistor value to set the desired switching frequency between 500kHz and 1200kHz.

4. Current Limit (ILIM):

   • The current limit is typically set to 20A. Use the ISNS pin to adjust the current limit if necessary.
   • Connect a sense resistor in series with the inductor to monitor the current.

5. Thermal Management:

   • Ensure proper thermal management by providing adequate heatsinking or using a heat spreader.
   • Operate the device within the specified temperature range to avoid overheating.

6. Layout Considerations:

   • Place input and output capacitors as close as possible to the IC to minimize parasitic inductance.
   • Use wide traces for power paths to reduce resistance and inductance.
   • Keep the ground plane solid and continuous to ensure good grounding.

7. Protection Features:

   • The LTC3878EGN includes overcurrent protection, overvoltage protection, and thermal shutdown to protect the device and the system.
   • Ensure that these features are enabled and configured correctly.

8. Testing and Debugging:

   • Test the circuit under various load conditions to ensure stable operation.
   • Use an oscilloscope to monitor the output voltage and switching waveforms for any abnormalities.

By following these instructions, you can effectively design and implement a power supply using the LTC3878EGN.

(For reference only)