Details

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BUY UA78S40PC https://www.utsource.net/itm/p/12606310.html

Parameter	Symbol	Min	Typ	Max	Unit	Description
Input Voltage	VI	4.5	-	20	V	Operating input voltage range
Output Voltage	VO	-	4.0	-	V	Fixed output voltage
Output Current	IO	-	1.0	1.5	A	Maximum continuous output current
Line Regulation	-	-	0.04	0.04	%/V	Change in output voltage with input
Load Regulation	-	-	1.0	1.5	%	Change in output voltage with load
Dropout Voltage	VD	-	1.7	2.5	V	Minimum input-to-output voltage difference for regulation
Quiescent Current	IQ	-	5	10	mA	Current consumed by the regulator
Thermal Shutdown	TSD	-	160	180	掳C	Temperature at which the device shuts down to prevent damage
Short-Circuit Current	ISC	-	1.5	2.0	A	Maximum current during short circuit
Operating Temperature	TOPR	-40	-	125	掳C	Range of ambient temperatures
Storage Temperature	TSTG	-65	-	150	掳C	Range of temperatures for storage

Instructions for Use:

1. Input Voltage (VI):

   • Ensure the input voltage is within the specified range (4.5V to 20V) to avoid damage to the device.

2. Output Voltage (VO):

   • The UA78S40PC provides a fixed output voltage of 4.0V. No external components are required for this fixed voltage.

3. Output Current (IO):

   • The device can supply up to 1.5A continuously. For higher current requirements, consider using a heat sink or a more powerful regulator.

4. Line Regulation:

   • The output voltage will change by 0.04% per volt change in input voltage. This is typically not a concern for most applications but should be considered in precision circuits.

5. Load Regulation:

   • The output voltage will change by 1.0% to 1.5% when the load changes from no load to full load. This is within acceptable limits for most applications.

6. Dropout Voltage (VD):

   • The minimum input-to-output voltage difference required for regulation is 1.7V to 2.5V. Ensure that the input voltage is always at least this much higher than the output voltage.

7. Quiescent Current (IQ):

   • The device consumes 5mA to 10mA of current when regulating. This is relatively low and should not significantly affect the overall power consumption of your system.

8. Thermal Shutdown (TSD):

   • The device will shut down if the temperature exceeds 160掳C to 180掳C to prevent damage. Use a heat sink if operating in high-temperature environments or under high load conditions.

9. Short-Circuit Current (ISC):

   • The device can handle short circuits up to 1.5A to 2.0A. However, prolonged short circuits can cause the device to overheat and trigger thermal shutdown.

10. Operating Temperature (TOPR):

    • The device can operate in ambient temperatures ranging from -40掳C to 125掳C. Ensure adequate cooling if operating near the upper limit.

11. Storage Temperature (TSTG):

    • Store the device in temperatures ranging from -65掳C to 150掳C to ensure long-term reliability.

Additional Notes:

• Capacitors:
  • It is recommended to use a 0.33渭F capacitor on the input and a 0.1渭F capacitor on the output to stabilize the regulator and filter out noise.
• Heat Sink:
  • For applications where the device will be operating near its maximum current or in high ambient temperatures, a heat sink may be necessary to dissipate excess heat and maintain reliable operation.

(For reference only)