Details

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BUY UC3854BN https://www.utsource.net/itm/p/12606181.html

Parameter	Description	Min	Typical	Max	Unit
Input Voltage (Vcc)	Operating supply voltage	12	-	40	V
Reference Voltage (Vref)	Internal reference voltage	-	5.0	-	V
Oscillator Frequency (fosc)	Frequency range of internal oscillator	10	-	500	kHz
Current Limit (Ilim)	Maximum current limit for the boost converter	0.5	-	3.0	A
Error Amplifier Gain (Ae)	Gain of the error amplifier	-	50	-	dB
Compensation Network	External compensation network for loop stability	-	-	-	-
Soft-Start Time (Tss)	Time required for soft-start operation	0.1	-	1.0	ms
Overcurrent Protection (OCP)	Threshold for overcurrent protection	0.6	-	1.2	A
Overvoltage Protection (OVP)	Threshold for overvoltage protection	12	-	40	V
Thermal Shutdown (TSD)	Temperature at which thermal shutdown occurs	150	-	-	掳C
Package Type	Physical package type	-	DIP-16, SOIC-16	-	-

Instructions for UC3854BN

1. Power Supply Connection:

   • Connect the Vcc pin to the positive supply voltage (12V to 40V).
   • Connect the GND pin to the ground.

2. Reference Voltage:

   • The internal reference voltage (Vref) is 5.0V. Use this for setting up the feedback loop.

3. Oscillator Configuration:

   • Set the oscillator frequency (fosc) by connecting an external resistor and capacitor between the RT/CT pins and ground. The typical frequency range is 10kHz to 500kHz.

4. Current Limiting:

   • Set the current limit (Ilim) by connecting an external resistor between the Ilim pin and ground. The typical range is 0.5A to 3.0A.

5. Error Amplifier:

   • The error amplifier gain (Ae) is typically 50dB. Connect the feedback signal to the FB pin and the reference voltage to the Vref pin.

6. Compensation Network:

   • Design an external compensation network (typically consisting of resistors and capacitors) to ensure loop stability. Connect this network between the COMP pin and ground.

7. Soft-Start:

   • The soft-start time (Tss) can be adjusted by connecting a capacitor between the SS pin and ground. The typical range is 0.1ms to 1.0ms.

8. Protection Features:

   • The UC3854BN includes overcurrent protection (OCP) and overvoltage protection (OVP). The OCP threshold is typically 0.6A to 1.2A, and the OVP threshold is 12V to 40V.
   • Thermal shutdown (TSD) occurs at approximately 150掳C to protect the device from overheating.

9. Package Handling:

   • The UC3854BN is available in DIP-16 and SOIC-16 packages. Ensure proper handling and soldering techniques to avoid damage.

10. Testing and Verification:

    • After assembly, test the circuit to ensure it meets the desired specifications. Verify the output voltage, current limit, and stability under various load conditions.

(For reference only)