Details

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BUY UC3854BDW https://www.utsource.net/itm/p/12541613.html

Parameter	Description	Min	Typ	Max	Unit
Input Voltage (Vcc)	Supply voltage range	10	-	40	V
Operating Temperature	Temperature range for operation	-40	-	125	°C
Storage Temperature	Temperature range for storage	-65	-	150	°C
Output Current (Iout)	Maximum output current	-	1.5	-	A
Switching Frequency (fsw)	Typical switching frequency	50	-	500	kHz
Duty Cycle Range	Adjustable duty cycle	0.5	-	99.5	%
Reference Voltage (Vref)	Internal reference voltage	2.5	-	2.5	V
Start-Up Current (Ist)	Minimum start-up current	0.5	-	1.0	mA
Shutdown Current (Ishd)	Shutdown mode current	0.01	-	0.05	mA
Error Amplifier Gain (Ae)	Open-loop gain of error amplifier	100	-	1000	V/V
Error Amplifier Bandwidth (fEA)	Bandwidth of error amplifier	10	-	100	kHz
Compensation Pin Capacitance (Ccomp)	Recommended compensation capacitor value	100	-	1000	pF
Overcurrent Protection (OCP)	Threshold for overcurrent protection	1.5	-	2.0	A
Undervoltage Lockout (UVLO)	Threshold for undervoltage lockout	8	-	10	V

Instructions for Using UC3854BDW

1. Power Supply Connection:

   • Connect the supply voltage (Vcc) to the appropriate pin.
   • Ensure the supply voltage is within the specified range (10V to 40V).

2. Ground Connection:

   • Connect the ground (GND) pin to the system ground.

3. Output Configuration:

   • Connect the load to the output pin.
   • Use an appropriate inductor and capacitor to filter the output and provide a stable DC voltage.

4. Feedback Loop:

   • Connect the feedback (FB) pin to the output voltage divider.
   • Adjust the resistors in the voltage divider to set the desired output voltage.

5. Error Amplifier:

   • Connect the compensation network to the compensation (COMP) pin.
   • Use a capacitor and resistor to tune the loop for stability.

6. Overcurrent Protection:

   • Connect a sense resistor between the output and the current sense (CS) pin.
   • Set the resistance value to trigger the overcurrent protection at the desired threshold.

7. Undervoltage Lockout:

   • The IC will automatically shut down if the input voltage drops below the UVLO threshold (8V to 10V).

8. Start-Up and Shutdown:

   • The IC will start up when the input voltage exceeds the UVLO threshold.
   • The shutdown current is minimal, allowing for low power consumption in standby mode.

9. Thermal Management:

   • Ensure proper heat dissipation by mounting the IC on a heatsink or using a thermal pad.
   • Monitor the operating temperature to avoid exceeding the maximum operating temperature (125°C).

10. Storage and Handling:

    • Store the IC in a dry, cool environment.
    • Handle with care to avoid damage from electrostatic discharge (ESD).

(For reference only)