Details

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BUY UC81236 https://www.utsource.net/itm/p/12610938.html

Parameter	Symbol	Min	Typ	Max	Unit	Description
Input Voltage	VIN	4.5	-	40	V	Operating input voltage range
Output Voltage	VOUT	-	5	-	V	Fixed output voltage
Output Current	IOUT	-	1.5	3	A	Continuous output current
Efficiency	η	-	92	-	%	Typical efficiency at nominal conditions
Quiescent Current	IQ	-	10	-	μA	Quiescent current
Dropout Voltage	VDROPOUT	-	1.2	-	V	Dropout voltage at full load
Load Regulation	ΔVOL	-	0.5	-	%	Change in output voltage with load
Line Regulation	ΔVOL	-	0.1	-	%	Change in output voltage with input
Ripple Rejection	RRR	-	70	-	dB	Power supply rejection ratio at 100 Hz
Operating Temperature	TOPR	-40	-	85	°C	Operating temperature range
Storage Temperature	TSTG	-65	-	150	°C	Storage temperature range
Thermal Shutdown	TSD	-	160	-	°C	Thermal shutdown threshold

Instructions for Using UC81236

1. Input Voltage (VIN):

   • Ensure the input voltage is within the specified range (4.5V to 40V).
   • Use appropriate filtering capacitors on the input to reduce noise and ripple.

2. Output Voltage (VOUT):

   • The UC81236 provides a fixed output voltage of 5V.
   • Verify the output voltage using a multimeter before connecting the load.

3. Output Current (IOUT):

   • The maximum continuous output current is 3A.
   • For higher currents, consider using external components or parallel configurations.

4. Efficiency (η):

   • The typical efficiency is 92% under nominal conditions.
   • Efficiency can be affected by input voltage, output current, and environmental conditions.

5. Quiescent Current (IQ):

   • The quiescent current is typically 10μA.
   • This low current draw helps in reducing power consumption during standby.

6. Dropout Voltage (VDROPOUT):

   • The dropout voltage is 1.2V at full load.
   • Ensure the input voltage is at least 1.2V higher than the output voltage to maintain regulation.

7. Load Regulation (ΔVOL):

   • The load regulation is 0.5%.
   • This indicates the stability of the output voltage under varying load conditions.

8. Line Regulation (ΔVOL):

   • The line regulation is 0.1%.
   • This indicates the stability of the output voltage under varying input conditions.

9. Ripple Rejection (RRR):

   • The power supply rejection ratio is 70dB at 100Hz.
   • Use bypass capacitors to further reduce ripple and noise.

10. Operating Temperature (TOPR):

    • The operating temperature range is -40°C to 85°C.
    • Ensure adequate cooling if operating near the upper limit.

11. Storage Temperature (TSTG):

    • The storage temperature range is -65°C to 150°C.
    • Store the device in a dry and cool environment to prevent damage.

12. Thermal Shutdown (TSD):

    • The thermal shutdown threshold is 160°C.
    • If the device exceeds this temperature, it will shut down to prevent damage. Allow the device to cool before resuming operation.

13. PCB Layout:

    • Place the input and output capacitors close to the IC to minimize inductance and improve performance.
    • Use wide traces for power connections to reduce resistance and heat generation.

14. Capacitors:

    • Use high-quality ceramic or tantalum capacitors for input and output filtering.
    • Ensure the capacitors have a sufficient voltage rating and low ESR (Equivalent Series Resistance).

15. Inductors:

    • If using an inductor in the circuit, ensure it has a low DC resistance and is rated for the maximum current.

16. Protection Circuits:

    • Consider adding overvoltage, undervoltage, and short-circuit protection circuits for enhanced reliability.

By following these instructions, you can ensure optimal performance and reliability of the UC81236 in your application.

(For reference only)