Details

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BUY LM138K-MIL https://www.utsource.net/itm/p/12609048.html

Parameter	Description	Min	Typ	Max	Unit
Output Voltage	Adjustable output voltage range	1.2	-	37	V
Line Regulation	Change in output voltage with respect to line voltage	-	0.015	-	%/V
Load Regulation	Change in output voltage with respect to load current	-	0.1	-	%/mA
Dropout Voltage	Minimum input-to-output voltage difference required for regulation	-	1.5	-	V
Quiescent Current	Supply current when no load is applied	10	-	40	mA
Output Current	Maximum continuous output current	-	-	1.5	A
Thermal Shutdown	Temperature at which the device shuts down to prevent damage	-	-	175	掳C
Storage Temperature	Range of temperatures over which the device can be stored without damage	-65	-	150	掳C
Operating Temperature	Range of temperatures over which the device can operate	-55	-	125	掳C

Instructions for Using the LM138K-MIL

1. Circuit Configuration:

   • The LM138K-MIL is an adjustable three-terminal positive voltage regulator.
   • Connect the input voltage to the "IN" pin, the output voltage to the "OUT" pin, and the adjustment pin to a resistor network to set the desired output voltage.

2. Output Voltage Setting:

   • Use the following formula to set the output voltage: [ V_{text} = 1.25 left(1 + fracright) + I_{text} R_2 ]
   • Where ( V_{text} ) is the desired output voltage, ( R_1 ) and ( R_2 ) are the resistors in the feedback network, and ( I_{text} ) is the adjustment pin current (typically very small, around 50 渭A).

3. Capacitor Requirements:

   • For stable operation, a minimum of 1 渭F tantalum capacitor should be connected between the output and ground.
   • A 1 渭F tantalum capacitor should also be connected between the input and ground if the regulator is located more than 6 inches from the power supply filter.

4. Thermal Considerations:

   • Ensure adequate heat sinking to keep the junction temperature below 175掳C.
   • Calculate the power dissipation using the formula: [ P_d = (V_{text} - V_{text}) times I_{text} ]
   • Use a heatsink if necessary to maintain safe operating temperatures.

5. Storage and Handling:

   • Store the device in a dry, cool environment within the storage temperature range (-65掳C to 150掳C).
   • Handle the device with care to avoid damage from electrostatic discharge (ESD).

6. Operating Temperature:

   • Operate the device within the specified operating temperature range (-55掳C to 125掳C) to ensure reliable performance.

7. Testing and Troubleshooting:

   • Verify the output voltage with a multimeter to ensure it matches the desired setting.
   • Check for proper connections and ensure all components are functioning correctly.
   • If the device overheats or fails to regulate, check for short circuits or incorrect component values.

(For reference only)