Details

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BUY UC2844ADTR https://www.utsource.net/itm/p/5341908.html
Current Mode PWM Controller

Parameter	Symbol	Min	Typ	Max	Unit	Description
Input Voltage	Vcc	12	16	30	V	Supply voltage range
Operating Temperature	Topr	-40		85	°C	Operating temperature range
Switching Frequency	fsw		100	400	kHz	Adjustable switching frequency
Output Current Limit	Ilim		1.0		A	Peak current limit
Start-Up Current	Ist		1.0		mA	Current required for start-up
Reference Voltage	Vref	2.5			V	Internal reference voltage
Duty Cycle Range	D	0		0.999		Maximum duty cycle
Quiescent Current	IQ		2.5		mA	Quiescent current at no load

Instructions for UC2844ADTR

1. Power Supply Connection:

   • Connect the supply voltage (Vcc) to pin 7.
   • Ensure Vcc is within the specified range of 12V to 30V.

2. Ground Connection:

   • Connect ground (GND) to pin 4 to establish a common reference point.

3. Output Configuration:

   • Connect an external transistor or MOSFET between pins 6 (output) and 4 (ground) for driving the power stage.

4. Feedback Loop:

   • Connect the feedback pin (pin 1) to a voltage divider or error amplifier output to control the output voltage regulation.

5. Frequency Setting:

   • Set the desired switching frequency by selecting appropriate values for the resistor connected to pin 5 (RT) and capacitor connected to pin 6 (CT).

6. Current Limiting:

   • Adjust the current limiting feature using an external resistor connected to pin 3 (ISENSE).

7. Start-Up Sequence:

   • Ensure that the start-up current (Ist) requirements are met to avoid improper operation during start-up.

8. Operating Temperature:

   • Operate the device within the specified temperature range (-40°C to 85°C) to ensure reliable performance.

9. Duty Cycle Control:

   • The duty cycle can be adjusted up to 0.999, allowing for high efficiency in various applications.

10. Quiescent Current Management:

    • Be mindful of the quiescent current consumption to optimize system efficiency, especially in low-power applications.

For detailed design considerations and application-specific configurations, refer to the manufacturer's datasheet.

(For reference only)