Details

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BUY LM317D2 https://www.utsource.net/itm/p/12610914.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	3.0	-	40	V
Output Voltage	VOUT	1.25	-	37	V
Output Current	IOUT	-	1.5	-	A
Line Regulation	-	-	0.01	-	%/V
Load Regulation	-	-	0.1	-	%
Dropout Voltage	VDROPOUT	1.0	-	2.5	V
Quiescent Current	IQ	-	5	-	mA
Thermal Resistance (胃JA)	-	-	65	-	掳C/W
Operating Temperature	TJ	-40	-	125	掳C

Instructions for Using LM317D2

1. Circuit Configuration:

   • Connect the input voltage (VIN) to the input pin.
   • Connect the output voltage (VOUT) to the output pin.
   • Connect the adjustment pin (ADJ) to a voltage divider formed by two resistors (R1 and R2) to set the desired output voltage.

2. Output Voltage Calculation:

   • The output voltage can be calculated using the formula: [ V_ = 1.25 left(1 + fracright) + I_ cdot R2 ]
   • For most applications, (I_) is very small (typically 50 渭A) and can be neglected, simplifying the formula to: [ V_ = 1.25 left(1 + fracright) ]

3. Capacitor Requirements:

   • An input capacitor (typically 0.1 渭F) is recommended to stabilize the input voltage.
   • An output capacitor (typically 1 渭F) is required for stability, especially when the output voltage is less than 10 V.

4. Thermal Management:

   • Ensure adequate heat dissipation if operating at high currents or high ambient temperatures. Use a heatsink if necessary.

5. Protection:

   • Consider adding a fuse in series with the input to protect against overcurrent conditions.
   • Use a diode (e.g., 1N4007) across the input and output to prevent reverse voltage damage during power-down.

6. Layout Considerations:

   • Keep the leads short and direct to minimize noise and improve stability.
   • Place the capacitors as close as possible to the respective pins.

7. Storage and Handling:

   • Store in a dry, cool place.
   • Handle with care to avoid static damage. Use ESD protection where necessary.

By following these guidelines, you can effectively use the LM317D2 in your power supply designs.

(For reference only)