Details

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BUY KA78M05 https://www.utsource.net/itm/p/1432384.html
3-terminal 0.5A positive voltage regulator

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Input Voltage	VI	7	-	40	V
Output Voltage	VO	-	5	-	V	Fixed
Output Current	IO	-	1	1.5	A
Dropout Voltage	VDROP	-	1.5	-	V
Quiescent Current	IQ	-	5	10	mA
Line Regulation	-	-	0.01	-	%/V
Load Regulation	-	-	0.01	-	%/mA
Ripple Rejection	-	-	60	-	dB
Operating Temperature	TOP	-40	-	125	°C
Storage Temperature	TS	-65	-	150	°C

Instructions for Using KA78M05:

1. Input Voltage (V_I):

   • Ensure the input voltage is within the range of 7V to 40V.
   • The input voltage should be at least 1.5V higher than the output voltage (5V) to maintain regulation.

2. Output Voltage (V_O):

   • The output voltage is fixed at 5V. No external components are required to set this voltage.

3. Output Current (I_O):

   • The regulator can provide up to 1.5A of current, with a typical output current of 1A.
   • Ensure that the load does not exceed the maximum output current to avoid overheating or damage.

4. Dropout Voltage (V_DROP):

   • The dropout voltage is typically 1.5V. This means the input voltage must be at least 6.5V to ensure stable 5V output.

5. Quiescent Current (I_Q):

   • The quiescent current is typically 5mA and can go up to 10mA.
   • This current is drawn by the regulator itself and is not available for the load.

6. Line Regulation:

   • The line regulation is typically 0.01% per volt, indicating excellent stability of the output voltage with respect to changes in input voltage.

7. Load Regulation:

   • The load regulation is typically 0.01% per milliamp, indicating excellent stability of the output voltage with respect to changes in load current.

8. Ripple Rejection:

   • The ripple rejection is typically 60dB, which means the regulator effectively reduces input ripple to the output.

9. Operating Temperature (T_OP):

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

10. Storage Temperature (T_S):

    • The storage temperature range is from -65°C to 150°C.
    • Store the regulator in a dry environment to prevent moisture damage.

11. Heat Dissipation:

    • Use a heatsink if the regulator will be operating at high currents or in high-temperature environments to prevent overheating.

12. Capacitors:

    • It is recommended to use a 0.33μF ceramic capacitor on the input and a 0.1μF ceramic capacitor on the output for stability and noise reduction.

13. PCB Layout:

    • Keep the input and output capacitors as close as possible to the regulator to minimize inductance and improve performance.
    • Use wide traces for power and ground to reduce resistance and improve heat dissipation.

14. Polarity:

    • Ensure correct polarity when connecting the input and output. Reversing the polarity can damage the regulator.

(For reference only)