Details

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BUY UC2903N https://www.utsource.net/itm/p/482822.html
Quad Supply and Line Monitor

Parameter	Symbol	Min	Typical	Max	Unit	Conditions
Input Voltage	VIN	4.5	-	40	V
Output Voltage	VOUT	1.2	-	15	V	Adjustable
Output Current	IOUT	-	1.5	3	A
Quiescent Current	IQ	-	5	10	mA	No load, VOUT = 5V
Dropout Voltage	VDROPOUT	-	1.7	2.5	V	IOUT = 1.5A
Load Regulation	-	-	0.5	1	%	0 to 3A
Line Regulation	-	-	0.01	0.1	%/V	VIN = 4.5V to 40V
Ripple Rejection	-	-	70	80	dB	f = 120Hz
Thermal Shutdown	TSD	-	160	-	°C
Operating Temperature	TOPR	-40	-	125	°C
Storage Temperature	TSTG	-65	-	150	°C

Instructions for Using UC2903N:

1. Input Voltage (VIN):

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

2. Output Voltage (VOUT):

   • The output voltage can be adjusted using external resistors. The formula for setting the output voltage is: [ V_ = 1.25 left(1 + fracright) ]
   • Choose R1 and R2 values to achieve the desired output voltage.

3. Output Current (IOUT):

   • The maximum continuous output current is 3A, with a typical value of 1.5A.
   • Ensure the power supply can handle the required current and that the heat dissipation is adequate.

4. Quiescent Current (IQ):

   • The quiescent current is typically 5mA and should not exceed 10mA under no-load conditions.
   • This current is drawn from the input supply even when there is no load on the output.

5. Dropout Voltage (VDROPOUT):

   • The dropout voltage is the minimum difference between the input and output voltages required to maintain regulation.
   • It typically ranges from 1.7V to 2.5V at full load.

6. Load Regulation:

   • The load regulation is the change in output voltage due to changes in load current.
   • It is typically 0.5% and should not exceed 1%.

7. Line Regulation:

   • The line regulation is the change in output voltage due to changes in input voltage.
   • It is typically 0.01% per volt and should not exceed 0.1% per volt.

8. Ripple Rejection:

   • The ripple rejection is the ability of the regulator to reject input ripple.
   • It is typically 70dB and should not fall below 80dB at 120Hz.

9. Thermal Shutdown (TSD):

   • The device will shut down if the junction temperature exceeds 160°C to prevent damage.
   • Ensure proper heat sinking and ventilation to keep the temperature within safe limits.

10. Operating Temperature (TOPR):

    • The operating temperature range is from -40°C to 125°C.
    • Ensure the ambient temperature and heat dissipation are managed to keep the device within this range.

11. Storage Temperature (TSTG):

    • The storage temperature range is from -65°C to 150°C.
    • Store the device in a dry, cool place to avoid damage.

Additional Notes:

• Always use appropriate bypass capacitors on the input and output to ensure stability and reduce noise.
• Refer to the datasheet for detailed information on pin configurations, thermal considerations, and application circuits.

(For reference only)