Details

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BUY LM317BTG,LM317BT https://www.utsource.net/itm/p/11623426.html

Parameter	LM317BTG / LM317BT
Output Voltage Range	1.25V to 37V
Input Voltage Range	3V to 40V
Output Current	Up to 1.5A
Line Regulation	0.01% (typical)
Load Regulation	0.1% (typical)
Dropout Voltage	3V (maximum)
Thermal Resistance (胃JA)	65掳C/W
Operating Temperature	-40掳C to 125掳C
Storage Temperature	-65掳C to 150掳C
Package Type	TO-220
Pins	3
Pin Configuration	Adj (1), Out (2), In (3)

Instructions for Using LM317BTG / LM317BT

1. Circuit Connection:

   • Input (In): Connect the input voltage to this pin.
   • Output (Out): Connect the load to this pin.
   • Adjust (Adj): Connect a resistor network to this pin to set the output voltage.

2. Setting Output Voltage:

   • Use the following formula to set the output voltage: [ V_{text} = 1.25 left(1 + fracright) + I_{text} cdot R_2 ] where ( R_1 ) is the resistor connected between the output and adjust pins, ( R_2 ) is the resistor connected between the adjust and ground pins, and ( I_{text} ) is the current through the adjust pin (typically 50 渭A).

3. Capacitors:

   • Input Capacitor: A 0.1 渭F capacitor is recommended between the input and ground to improve transient response and stability.
   • Output Capacitor: A 1 渭F capacitor is recommended between the output and ground to improve ripple rejection and stability.

4. Heat Dissipation:

   • Ensure proper heat sinking if the regulator will be operating at high power levels to prevent overheating. The thermal resistance (胃JA) is 65掳C/W, so calculate the heat dissipation based on the power requirements.

5. Protection:

   • The LM317 includes internal current limiting, thermal shutdown, and safe area compensation to protect against overcurrent and overtemperature conditions.

6. Mounting:

   • Mount the regulator on a heatsink if necessary, ensuring good thermal contact. Use thermal compound to enhance heat transfer.

7. Testing:

   • After assembly, test the circuit under various load conditions to ensure it meets the required specifications. Measure the output voltage and current to verify proper operation.

(For reference only)