Details

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BUY LM2576T-ADJ TO-220 CHINA ORIGINAL https://www.utsource.net/itm/p/11258270.html

Parameter	Description	Value
Package Type	Package Style	TO-220
Input Voltage Range	Minimum Input Voltage	4.5V - 40V
Output Voltage Range	Adjustable Output Voltage	1.23V to 37V
Output Current	Maximum Continuous Output Current	3A
Switching Frequency	Internal Oscillator Frequency	52kHz
Quiescent Current	Quiescent Current (Typical)	5mA
Shutdown Current	Shutdown Mode Current (Typical)	100渭A
Operating Temperature	Junction Temperature Range	-40掳C to +125掳C
Storage Temperature	Storage Temperature Range	-65掳C to +150掳C
Thermal Resistance	Junction to Case	5掳C/W
Thermal Resistance	Junction to Ambient (with heatsink)	35掳C/W
Protection Features	Overcurrent Protection	Yes
Protection Features	Thermal Shutdown	Yes

Instructions for Use:

1. Circuit Configuration:

   • Connect the input voltage to the "VIN" pin.
   • Connect the output capacitor (typically 100渭F to 1000渭F) between the "VOUT" pin and ground.
   • Connect the feedback resistor network between the "VOUT" pin, the "ADJ" pin, and ground to set the desired output voltage.
   • Connect the inductor (typically 100渭H to 1000渭H) between the "SW" pin and the "VOUT" pin.

2. Output Voltage Adjustment:

   • The output voltage can be adjusted using the formula: [ V_ = V_ left(1 + fracright) ] where ( V_ = 1.23V ), ( R_1 ) is the resistor connected between the "VOUT" pin and the "ADJ" pin, and ( R_2 ) is the resistor connected between the "ADJ" pin and ground.

3. Heat Dissipation:

   • Ensure proper heat dissipation by mounting the device on a heatsink if operating at high current or high ambient temperatures.

4. Capacitor Selection:

   • Use electrolytic capacitors with a ripple current rating suitable for the expected load.
   • For the input capacitor, a value of 100渭F to 1000渭F is recommended.
   • For the output capacitor, a value of 100渭F to 1000渭F is recommended.

5. Inductor Selection:

   • Choose an inductor with a saturation current higher than the maximum output current.
   • A typical value is 100渭H to 1000渭H.

6. PCB Layout:

   • Keep the traces from the "SW" pin to the inductor as short as possible to minimize parasitic inductance.
   • Place the input and output capacitors close to the respective pins to reduce noise and improve stability.

7. Testing:

   • After assembly, test the circuit under no-load conditions to verify the output voltage.
   • Gradually increase the load to ensure stable operation and correct output voltage.

8. Safety Precautions:

   • Ensure all components are rated for the maximum expected voltages and currents.
   • Use appropriate insulation and safety measures when handling high voltages.

(For reference only)