SNVSAC2A March 2015 – June 2020 LM317A
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1 1.25-V to 25-V Adjustable Regulator
- 8.2.2 5-V Logic Regulator With Electronic Shutdown
- 8.2.3 Slow Turnon 15-V Regulator
- 8.2.4 Adjustable Regulator With Improved Ripple Rejection
- 8.2.5 High-Stability 10-V Regulator
- 8.2.6 High-Current Adjustable Regulator
- 8.2.7 Emitter-Follower Current Amplifier
- 8.2.8 1-A Current Regulator
- 8.2.9 Common-Emitter Amplifier
- 8.2.10 Low-Cost 3-A Switching Regulator
- 8.2.11 Current-Limited Voltage Regulator
- 8.2.12 Adjusting Multiple On-Card Regulators With Single Control
- 8.2.13 AC Voltage Regulator
- 8.2.14 12-V Battery Charger
- 8.2.15 Adjustable 4-A Regulator
- 8.2.16 Current-Limited 6-V Charger
- 8.2.17 Digitally-Selected Outputs
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DCY|4
訂購(gòu)信息
8.2.15 Adjustable 4-A Regulator
Using three LM317A devices in parallel increases load-current capability (see Figure 33). Output voltage is set by the variable resistor tied to the noninverting terminal of the operational amplifier, and reference current to the transistor is developed across the 100-Ω resistor. When output voltage rises, the operational amplifier corrects by drawing current from the base, closing the transistor. This effectively pulls ADJ down and lowers the output voltage through negative feedback.
Figure 33. Adjustable 4-A Regulator