Details

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BUY LM2574M-5.0 https://www.utsource.net/itm/p/12606508.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Continuous	6.5	-	40	V
Output Voltage	VOUT	Fixed	-	5.0	-	V
Output Current	IOUT	Continuous	-	3.0	-	A
Switching Frequency	fSW	Typical	-	52	-	kHz
Dropout Voltage	VDROPOUT	IOUT = 1A	-	2.0	-	V
Quiescent Current	IQ	VIN = 12V, No Load	-	5	-	mA
Load Regulation	-	0 to 3A	-	0.5	-	%
Line Regulation	-	8 to 40V	-	0.1	-	%
Efficiency	畏	VIN = 12V, IOUT = 1A	-	85	-	%
Thermal Shutdown	TSD	Typical	-	160	-	掳C
Storage Temperature	TSTG	-	-40	-	125	掳C

Instructions for Using the LM2574M-5.0

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 6.5V to 40V. The regulator will not function properly outside this range.

2. Output Voltage (VOUT):

   • The output voltage is fixed at 5.0V. No external components are required to set this voltage.

3. Output Current (IOUT):

   • The maximum continuous output current is 3.0A. Ensure that the load does not exceed this limit to avoid overheating or damage.

4. Switching Frequency (fSW):

   • The typical switching frequency is 52kHz. This helps in minimizing the size of external components like inductors and capacitors.

5. Dropout Voltage (VDROPOUT):

   • At an output current of 1A, the dropout voltage is typically 2.0V. This means the input voltage must be at least 2V higher than the output voltage to maintain regulation.

6. Quiescent Current (IQ):

   • The quiescent current is typically 5mA when the input voltage is 12V and there is no load on the output.

7. Load Regulation:

   • The load regulation is 0.5% from 0 to 3A. This indicates how well the output voltage remains stable under varying load conditions.

8. Line Regulation:

   • The line regulation is 0.1% from 8 to 40V. This indicates how well the output voltage remains stable under varying input voltage conditions.

9. Efficiency (畏):

   • The efficiency is typically 85% when the input voltage is 12V and the output current is 1A. Higher efficiency reduces power loss and heat generation.

10. Thermal Shutdown (TSD):

    • The thermal shutdown temperature is typically 160掳C. The regulator will shut down if the internal temperature exceeds this value to prevent damage.

11. Storage Temperature (TSTG):

    • The storage temperature range is from -40掳C to 125掳C. Store and handle the device within this temperature range to ensure reliability.

Additional Notes:

• Capacitor Selection: Use a 100nF ceramic capacitor and a 10渭F electrolytic capacitor on the input side to filter noise and provide stability.
• Inductor Selection: Choose an inductor with a value between 100渭H and 1000渭H depending on the load requirements and desired performance.
• PCB Layout: Ensure proper PCB layout to minimize noise and improve thermal performance. Place the heat sink on the TO-220 package if necessary to dissipate heat effectively.

(For reference only)