Details

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BUY UC2845N https://www.utsource.net/itm/p/8053953.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Switching Frequency	fsw			100	500	kHz
Supply Voltage	Vcc	Operating	12		40	V
	Vcc	Start-up	16			V
Current Limit	ILIM			1.0	1.5	A
Reference Voltage	Vref			5.0		V
Dead Time	tdead			1.0		μs
Duty Cycle	D	Maximum			0.5
Temperature Range	Toper	Operating	-40		85	°C

Instructions for UC2845N

1. Power Supply Connection:

   • Connect the supply voltage (Vcc) to pin 7.
   • Ensure the supply voltage is within the operating range of 12V to 40V.

2. Setting the Switching Frequency:

   • The switching frequency can be set using an external resistor connected between pins 3 and 4. Adjust this resistor to achieve the desired frequency within the range of 100kHz to 500kHz.

3. Current Limit Configuration:

   • The current limit can be adjusted by connecting a resistor between pins 1 and 2. The typical current limit is around 1.0A to 1.5A.

4. Reference Voltage Output:

   • Pin 14 provides a stable reference voltage of 5.0V, which can be used for various biasing purposes in the circuit.

5. Dead Time Adjustment:

   • The dead time between switch transitions is internally set to approximately 1.0μs to prevent shoot-through currents.

6. Duty Cycle Limitation:

   • The maximum duty cycle is limited to 50% to ensure proper operation and prevent overloading.

7. Temperature Considerations:

   • Ensure the operating temperature remains within -40°C to 85°C to maintain reliable performance.

8. Layout Recommendations:

   • Use short leads and wide traces for power connections to minimize parasitic inductance.
   • Place decoupling capacitors close to the Vcc pin to improve stability.

9. Protection Features:

   • The UC2845N includes protection features such as overcurrent protection and thermal shutdown. Verify these functionalities are correctly integrated into your design.

10. Testing and Validation:

    • After assembly, test the circuit under different load conditions to ensure it meets the specified parameters and operates reliably.

(For reference only)