LM317 Voltage Regulator
LM317 Voltage Regulator: The LM317 device is a three-terminal adjustable positive voltage regulator that can supply more than 1.5A in the output voltage range of 1.25V to 37V. It only needs two external resistors to adjust. the output voltage. The device has normal line control of 0.01% and normal load control of 0.1%. It includes current limit, thermal overload protection, and safe operation zone protection. The overload protection remains active even if the ADJUST terminal is disconnected.
24v lead acid battery charger circuit diagram
The 24V lead acid battery charger circuit given here is a current limited lead acid battery charger built around the famous variable voltage regulator IC LM317. The charging current depends on the value of resistor R2 and here it is set to be 700mA. Resistor R3 and POT R4 determine the charging voltage.
LM317 24v lead acid battery charger circuit diagram
Transformer T1 steps down the mains voltage and bridge D1 does the job of rectification. C1 is the filter capacitor. Diode D1 prevents the reverse flow of current from the battery when the charger is switched OFF or when mains power is not available.
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LM317 Voltage Regulator Circuit Making
Assemble the circuit on a good quality PCB.
T1 can be a 230V primary, 35V/3A secondary step-down transformer.
If 3A Bridge is not available, make one using four 1N5003 diodes.
LM317 must be fitted with a heat sink.
R2 = 0.85 ohm is not a standard value. You can obtain it by combining 6.2 ohm and 1-ohm resistors in parallel.
F1 can be a 2A fuse.
To set up the charging voltage, power ON the charger hook up a voltmeter across the output terminals and adjust R4 to make the voltmeter read 28V. Now the charger is ready you can connect the batteries.
This charger is specifically designed for two 12V/7AH/6 cell lead-acid batteries in series OR a 24V/7AH/12 cell lead-acid battery.
LM317 Pinout Diagram
The LM317 Voltage Regulator is a 3-terminal adjustable voltage regulator which can supply an output voltage adjustable from 1.2V to 37V. It can supply more than 1.5A of load current to a load.
LM317 Voltage Regulator Schematic Diagram
LM317 Schematic Diagram
- Output voltage range adjustable from 1.25 V to 37 V.
- Output current greater than 1.5 A.
- Internal short-circuit current limiting.
- Thermal overload protection.
- Output safe-area compensation.
Lm317 IC Applications
- ATCA solutions.
- DLP: 3D biometrics, hyperspectral imaging, optical networking, and spectroscopy
- Desktop PCs
- Digital signage and still cameras
- ECG electrocardiograms •
- EV HEV chargers: levels 1, 2, and 3
- Electronic shelf labels
- Energy harvesting
- Ethernet switches
- Femto base stations
- Fingerprint and iris biometrics
- HVAC: heating, ventilating, and air conditioning
- High-speed data acquisition and generation •
- Hydraulic valves.
Here you can download the LM317 Datasheet pdf and I keep the copy and paste the link given below