Details

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BUY LM2576T-12=LM2576T12 https://www.utsource.net/itm/p/11896429.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Operating	4.5	-	40	V
Output Voltage	VOUT	Fixed	-	12	-	V
Output Current	IOUT	Continuous	-	3	-	A
Switching Frequency	fSW	Typical	-	52	-	kHz
Dropout Voltage	VDROPOUT	At 3A, VIN=14V	-	2.5	-	V
Quiescent Current	IQ	No load, VIN=12V	-	5	-	mA
Shutdown Current	ISD	VIN=12V	-	50	-	μA
Efficiency	η	@ VIN=12V, VOUT=5V, IOUT=1A	-	82	-	%

Instructions for LM2576T-12

1. Input Capacitor (CIN):

   • Place a low ESR capacitor close to the input pin to ensure stability and minimize input ripple.
   • Recommended: 330 μF aluminum electrolytic or equivalent.

2. Output Capacitor (COUT):

   • Use a low ESR capacitor to minimize output ripple.
   • Recommended: 1000 μF aluminum electrolytic or equivalent.

3. Inductor Selection (L):

   • Choose an inductor based on the desired ripple current and output voltage regulation.
   • Typical value: 100 μH for most applications.

4. Feedback Resistor Network:

   • The LM2576T-12 has a fixed output voltage of 12V, so no external resistors are needed for feedback.

5. Diode Selection:

   • Select a Schottky diode with low forward voltage drop to improve efficiency.
   • Ensure it can handle the peak current and power dissipation.
   • Recommended: 1N5822 or similar.

6. Layout Considerations:

   • Keep the layout compact and minimize trace lengths, especially for high-frequency nodes like the switch node.
   • Ensure good grounding practices to reduce noise and interference.

7. Thermal Management:

   • Provide adequate heat sinking if operating at high currents or in high ambient temperatures.
   • Monitor temperature to avoid exceeding maximum junction temperature.

8. Shutdown Pin:

   • Apply a logic high (≥1.2V) to enable the regulator.
   • Apply a logic low (<0.4V) to put the regulator into shutdown mode, reducing input supply current to about 50 μA.

9. Capacitor and Inductor Placement:

   • Place the output capacitor as close as possible to the IC’s output and ground pins.
   • Place the inductor between the switch node and the output capacitor.

By following these guidelines, you can ensure optimal performance and reliability of the LM2576T-12 in your application.

(For reference only)