Details

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BUY L4938ED https://www.utsource.net/itm/p/8840830.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN		10.8		72	V
Output Voltage	VOUT		5		42	V
Output Current	IOUT			3		A
Switching Frequency	fSW			100		kHz
Quiescent Current	IQ	VIN = 12V		10		mA
Shutdown Current	ISD	VIN = 12V		0.1		μA
Minimum ON Time	tONmin			2.5		μs
Maximum Duty Cycle	Dmax			97%		%
Thermal Shutdown	TSD			160		°C

Instructions for L4938ED

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 10.8V to 72V.

2. Output Configuration:

   • Set the output voltage as required, ensuring it remains between 5V and 42V.
   • The maximum output current should not exceed 3A.

3. Switching Frequency:

   • The switching frequency is set to 100kHz. Verify that this frequency is suitable for your application.

4. Quiescent Current:

   • At an input voltage of 12V, the quiescent current is typically 10mA. This value helps in power consumption calculations.

5. Shutdown Mode:

   • In shutdown mode, with an input voltage of 12V, the current draw is approximately 0.1μA.

6. Minimum ON Time:

   • The minimum ON time for the switch is 2.5μs. This parameter affects the duty cycle and frequency response.

7. Maximum Duty Cycle:

   • The maximum duty cycle is 97%. Adjust the timing components to ensure this limit is not exceeded.

8. Thermal Protection:

   • The device will enter thermal shutdown if the temperature exceeds 160°C. Ensure adequate heat sinking or cooling mechanisms are in place.

For detailed design considerations and specific application circuits, refer to the manufacturer’s datasheet or application notes.

(For reference only)