Details

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BUY UC2844L https://www.utsource.net/itm/p/8982171.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Switching Frequency	fsw	VCC = 5V	100	200	400	kHz
Duty Cycle Range	D		0.1		0.9
Input Voltage Range	VIN		7		36	V
Output Voltage Regulation	Vout	Line & Load	4.8	5	5.2	V
Start-Up Current	Istart	VCC rising		1		mA
Operating Temperature Range	Toper		-40		85	°C
Storage Temperature Range	Tstg		-40		125	°C

Instructions for UC2844L

1. Power Supply Connections:

   • Connect the positive terminal of the input voltage (VIN) to the VCC pin.
   • Connect the negative terminal of the input voltage to the GND pin.

2. Output Configuration:

   • Set up the feedback network using a resistor divider from the output voltage to ground, connecting the mid-point to the FB pin for regulation.

3. Frequency Setting:

   • Use an external resistor and capacitor connected to the RT/CT pin to set the desired switching frequency.

4. Protection Circuits:

   • Ensure that the UC2844L is properly protected against overcurrent conditions by integrating appropriate sensing resistors and configuring the CS pin.

5. Thermal Management:

   • Provide adequate heat sinking if operating at high temperatures or under heavy load conditions.

6. Startup Sequence:

   • Ensure that the input voltage rises slowly enough to allow the UC2844L to initialize correctly. This can be controlled with an inrush current limiter or soft-start circuitry.

7. Testing and Verification:

   • After assembly, test the power supply under various line and load conditions to ensure stability and correct output regulation. Adjust the feedback network as necessary to optimize performance.

(For reference only)