Details

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BUY UC2543N https://www.utsource.net/itm/p/1404520.html
5V, 500mA low drop voltage regulator

Parameter	Symbol	Min	Typical	Max	Unit	Conditions/Comments
Input Voltage	VIN	4.5		40	V	Operating input voltage range
Output Voltage	VOUT		5.0		V	Fixed output voltage
Output Current	IOUT		1.2	3.0	A	Maximum continuous output current
Switching Frequency	fSW		650		kHz	Internal oscillator frequency
Quiescent Current	IQ		3.0		mA	Quiescent current at no load
Dropout Voltage	VDROPOUT		0.3		V	Dropout voltage at full load
Efficiency	η		88		%	Efficiency at typical conditions
Operating Temperature	TOPR	-40		125	°C	Operating junction temperature range

Instructions for UC2543N

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the power supply ensuring it is within the specified range of 4.5V to 40V.
   • Ensure proper decoupling capacitors are placed close to the VIN pin to stabilize the input voltage.

2. Output Configuration:

   • The UC2543N provides a fixed output voltage of 5.0V. Verify that this meets your application requirements.
   • Use appropriate output capacitors to filter and smooth the output voltage.

3. Current Limitation:

   • The device can provide up to 3.0A of continuous output current. Design the PCB layout to handle this current without overheating.

4. Thermal Considerations:

   • Operate the device within the temperature range of -40°C to 125°C. For high current applications, ensure adequate heat sinking or cooling measures.

5. Switching Frequency:

   • The internal switching frequency is set to 650kHz. This helps in reducing the size of external components like inductors and capacitors.

6. Efficiency Optimization:

   • To achieve the typical efficiency of 88%, ensure all connections are optimized and parasitic resistances are minimized.

7. Protection Features:

   • The UC2543N includes built-in protection features such as overcurrent protection and thermal shutdown. These features help protect the device from damage under fault conditions.

8. Layout Recommendations:

   • Follow recommended PCB layout guidelines provided by the manufacturer to ensure optimal performance and reliability. Keep traces short and wide, especially for high current paths.

(For reference only)