Details

---

BUY LM2576T-ADJ LM2576T https://www.utsource.net/itm/p/11665086.html

Parameter	Symbol	Min	Typical	Max	Unit
Input Voltage	VIN	4.5	-	40	V
Output Voltage Range	VOUT	1.23	-	37	V
Output Current	IOUT	-	3	5	A
Switching Frequency	fSW	-	52	-	kHz
Quiescent Current	IQ	-	5	-	mA
Shutdown Current	ISD	-	80	-	渭A
Efficiency (Typical)	畏	-	80	-	%
Dropout Voltage	VDROPOUT	-	1.5	-	V
Operating Temperature	TOPR	-40	-	125	掳C
Storage Temperature	TSTG	-65	-	150	掳C

Instructions for Using LM2576T-ADJ:

1. Circuit Configuration:

   • Connect the input voltage (VIN) to the input pin.
   • Connect the output capacitor (COUT) between the output pin (VOUT) and ground.
   • Use an inductor (L) between the SW pin and the output capacitor.
   • Place a feedback resistor network (R1 and R2) between the output and the ADJ pin to set the desired output voltage.

2. Output Voltage Calculation:

   • The output voltage (VOUT) can be calculated using the formula: [ V_ = V_ left(1 + fracright) ]
   • Where ( V_ ) is the reference voltage (1.23V).

3. Component Selection:

   • Inductor (L): Choose an inductor value based on the desired output current and switching frequency. A typical value is 100 渭H.
   • Output Capacitor (COUT): Use a low ESR electrolytic capacitor, typically 100 渭F to 220 渭F.
   • Input Capacitor (CIN): Use a ceramic or tantalum capacitor, typically 0.33 渭F to 1 渭F.
   • Feedback Resistors (R1 and R2): Select values to achieve the desired output voltage. For example, to get 5V output, use R1 = 1.2 k惟 and R2 = 470 惟.

4. Thermal Considerations:

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

5. Shutdown Function:

   • To enable the shutdown function, connect the SHDN pin to ground. To turn the device on, connect the SHDN pin to VIN or a logic high signal.

6. Layout Recommendations:

   • Keep the traces from the input capacitor to the input pin as short as possible to minimize noise.
   • Place the output capacitor close to the output and ground pins to reduce ripple and improve stability.
   • Use wide traces for the ground plane to ensure good thermal performance.

By following these instructions, you can effectively design and implement a circuit using the LM2576T-ADJ regulator.

(For reference only)