Details

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BUY LM2678T-ADJ/NOPB https://www.utsource.net/itm/p/12612269.html

Parameter	Symbol	Min	Typical	Max	Unit
Input Voltage	VIN	4.5	-	36	V
Output Voltage	VOUT	1.23	-	35	V
Output Current	IOUT	-	3	5	A
Switching Frequency	fSW	-	260	-	kHz
Efficiency	畏	-	90	-	%
Quiescent Current	IQ	-	5	-	mA
Shutdown Current	ISD	-	50	-	渭A
Line Regulation	-	-	0.01	-	%/V
Load Regulation	-	-	0.01	-	%/A
Output Ripple Voltage	VRIPL	-	100	-	mVp-p
Thermal Resistance (胃JA)	-	-	40	-	掳C/W

Instructions for Using the LM2678T-ADJ/NOPB

1. Input Voltage (VIN):

   • The input voltage should be within the range of 4.5V to 36V.
   • Ensure that the input voltage is stable and does not exceed the maximum rating to avoid damaging the device.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted from 1.23V to 35V using external resistors.
   • Use the formula ( V_ = 1.23 left(1 + fracright) ) to set the desired output voltage, where ( R_1 ) and ( R_2 ) are the feedback resistors.

3. Output Current (IOUT):

   • The typical output current is 3A, with a maximum of 5A.
   • Ensure that the load does not exceed the maximum output current to prevent overheating or damage.

4. Switching Frequency (fSW):

   • The switching frequency is typically 260kHz.
   • This frequency can be adjusted by changing the value of the external inductor and capacitor.

5. Efficiency (畏):

   • The efficiency is typically around 90%.
   • Optimize the efficiency by selecting appropriate components and ensuring good thermal management.

6. Quiescent Current (IQ):

   • The quiescent current is typically 5mA.
   • This current is drawn even when the device is not supplying any load.

7. Shutdown Current (ISD):

   • The shutdown current is typically 50渭A.
   • Use the shutdown pin to reduce power consumption when the device is not in use.

8. Line Regulation:

   • The line regulation is typically 0.01%/V.
   • This indicates how much the output voltage changes with variations in the input voltage.

9. Load Regulation:

   • The load regulation is typically 0.01%/A.
   • This indicates how much the output voltage changes with variations in the load current.

10. Output Ripple Voltage (VRIPL):

    • The typical output ripple voltage is 100mV peak-to-peak.
    • Use appropriate filtering components to minimize ripple if required.

11. Thermal Resistance (胃JA):

    • The thermal resistance is typically 40掳C/W.
    • Ensure adequate heat dissipation to keep the device temperature within safe limits.

Additional Notes:

• Always use proper PCB layout techniques to minimize noise and improve performance.
• Refer to the datasheet for detailed information on component selection and layout guidelines.

(For reference only)