Details

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BUY LM2575T-ADJG https://www.utsource.net/itm/p/838308.html
1A, Adjustable Output Voltage 1.23 to 37V 52kHz Buck PWM Switching Regulator; Package: TO-220 5 LEAD STANDARD; No of Pins: 5; Container: Rail; Qty per Container: 50

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Continuous	7.0	-	40	V
Output Voltage Range	VOUT	Adjustable	1.23	-	37	V
Output Current	IOUT	Continuous	-	3.0	-	A
Switching Frequency	FSW	Fixed	-	52	-	kHz
Dropout Voltage	VDROPOUT	IOUT = 3A	-	1.6	-	V
Quiescent Current	IQ	VIN = 12V, No Load	-	5	-	mA
Efficiency	η	VIN = 12V, VOUT = 5V, IOUT = 1A	-	84	-	%
Ripple Rejection	RR	10kHz	-	60	-	dB
Start-Up Time	tSTART	VIN = 12V, VOUT = 5V	-	2.2	-	ms

Instructions for LM2575T-ADJG:

1. Input Capacitor Selection:

   • Choose a capacitor with a low ESR (Equivalent Series Resistance) to minimize input ripple.
   • Recommended values range from 0.33 μF to 10 μF.

2. Output Capacitor Selection:

   • Use an output capacitor with a capacitance value that provides adequate transient response and stability.
   • Typical values are between 100 μF and 1000 μF.

3. Feedback Resistor Network:

   • The output voltage is set by the feedback resistor network connected between the output and the feedback pin.
   • Use the formula ( V_ = 1.23 left(1 + fracright) ) to calculate the resistor values.

4. Inductor Selection:

   • Select an inductor based on the desired ripple current and the switching frequency.
   • Typical inductance values range from 100 μH to 1000 μH.

5. Diode Selection:

   • Choose a Schottky diode with a reverse voltage rating greater than the maximum input voltage.
   • Ensure the diode can handle peak currents up to twice the maximum output current.

6. Thermal Considerations:

   • Ensure adequate heat dissipation if operating at high output currents or high ambient temperatures.
   • Use a heatsink if necessary to maintain junction temperature within safe limits.

7. Layout Recommendations:

   • Keep the layout compact to minimize parasitic inductance and resistance.
   • Place bypass capacitors as close as possible to the input and output pins.

8. Startup and Shutdown:

   • The regulator starts up when the input voltage exceeds the startup threshold.
   • Proper sequencing of power supplies may be required in multi-rail systems.

9. Protection Features:

   • The device includes overcurrent protection and thermal shutdown to protect against excessive load conditions.

These guidelines ensure optimal performance and reliability of the LM2575T-ADJG in various applications.

(For reference only)