Details

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BUY UC3855BN https://www.utsource.net/itm/p/407435.html
Quad 2-input NAND gate

Parameter	Symbol	Min	Typical	Max	Unit	Description
Supply Voltage	Vcc	14	20	40	V	Operating supply voltage range
Quiescent Current	IQ	-	6	-	mA	Quiescent current at nominal operating conditions
Output Current	Iout	0.5	2.5	5	A	Peak output current
Oscillator Frequency Range	fosc	1	-	500	kHz	Adjustable oscillator frequency range
Duty Cycle Range	D	0	-	100	%	Adjustable duty cycle range
Reference Voltage	Vref	2.5	5	7.5	V	Internal reference voltage
Maximum Gate Drive Voltage	Vgs(max)	0	15	20	V	Maximum gate drive voltage
Operating Temperature	Toper	-40	-	125	°C	Operating temperature range
Storage Temperature	Tstg	-65	-	150	°C	Storage temperature range

Instructions for UC3855BN

1. Power Supply Connection:

   • Connect the supply voltage (Vcc) to the appropriate pin.
   • Ensure the supply voltage is within the specified range (14V to 40V).

2. Oscillator Configuration:

   • Use an external resistor and capacitor to set the oscillator frequency (fosc).
   • The formula for calculating the frequency is ( f_ = frac{1.1}{R times C} ), where R is in ohms and C is in farads.

3. Duty Cycle Control:

   • Adjust the duty cycle using an external control signal or a fixed resistor network.
   • The duty cycle can be varied from 0% to 100%.

4. Output Stage:

   • The UC3855BN can drive external MOSFETs or other switching elements.
   • Ensure the peak output current (Iout) does not exceed 5A.

5. Reference Voltage:

   • Use the internal reference voltage (Vref) for setting up feedback loops and other precision circuits.
   • The typical value is 5V, but it can range from 2.5V to 7.5V.

6. Thermal Management:

   • Ensure proper heat dissipation if operating at high temperatures.
   • The operating temperature range is -40°C to 125°C.

7. Storage Conditions:

   • Store the device in a dry environment with temperatures between -65°C and 150°C.

8. Protection Circuits:

   • Implement overcurrent and thermal protection circuits to safeguard the device and connected components.

9. Layout Considerations:

   • Keep high-frequency traces short and well-shielded to minimize noise and interference.
   • Use bypass capacitors close to the power pins to ensure stable operation.

10. Testing and Debugging:

    • Verify all connections and component values before applying power.
    • Monitor the output and control signals using an oscilloscope to ensure proper operation.

(For reference only)