Details

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BUY PST518B https://www.utsource.net/itm/p/12608675.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	4.5	-	28	V
Output Voltage	VOUT	0.8	-	5.5	V
Output Current	IOUT	-	3	3.5	A
Efficiency	畏	-	92	-	%
Switching Frequency	fSW	-	650	-	kHz
Quiescent Current	IQ	-	2.5	-	mA
Shutdown Current	ISD	-	1	-	渭A
Operating Temperature	TOPR	-40	-	125	掳C
Storage Temperature	TSTG	-55	-	150	掳C

Instructions for Using PST518B:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 4.5V to 28V.
   • Avoid connecting the input to voltages outside this range to prevent damage to the device.

2. Output Voltage (VOUT):

   • The output voltage can be set between 0.8V and 5.5V using external resistors.
   • Use the formula ( V_ = 0.8 left(1 + fracright) ) to calculate the resistor values, where ( R_1 ) and ( R_2 ) are the feedback resistors.

3. Output Current (IOUT):

   • The typical output current is 3A, with a maximum of 3.5A.
   • Ensure the load does not exceed the maximum output current to avoid overheating or damage.

4. Efficiency (畏):

   • The typical efficiency is 92%. Optimize the design for high efficiency by minimizing losses in the inductor and other components.

5. Switching Frequency (fSW):

   • The switching frequency is typically 650kHz.
   • This frequency helps in reducing the size of the external components but may increase EMI.

6. Quiescent Current (IQ):

   • The quiescent current is typically 2.5mA.
   • This is the current consumed by the device when it is active but not delivering power to the load.

7. Shutdown Current (ISD):

   • The shutdown current is typically 1渭A.
   • Use the shutdown pin to turn off the device and reduce power consumption when not in use.

8. Operating Temperature (TOPR):

   • The operating temperature range is from -40掳C to 125掳C.
   • Ensure the device is used within this temperature range to maintain reliable operation.

9. Storage Temperature (TSTG):

   • The storage temperature range is from -55掳C to 150掳C.
   • Store the device in a dry and cool environment to prevent damage.

10. PCB Layout:

    • Use a good PCB layout to minimize parasitic inductances and capacitances.
    • Place the input and output capacitors close to the device to reduce noise and improve stability.

11. Thermal Management:

    • Ensure adequate heat dissipation if the device is operating at high currents or in high ambient temperatures.
    • Consider using a heatsink or thermal pad to enhance thermal performance.

(For reference only)