SNVS774Q May 2004 – June 2020 LM117 , LM317-N
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1 1.25-V to 25-V Adjustable Regulator
- 9.2.2 5-V Logic Regulator With Electronic Shutdown
- 9.2.3 Slow Turnon 15-V Regulator
- 9.2.4 Adjustable Regulator With Improved Ripple Rejection
- 9.2.5 High Stability 10-V Regulator
- 9.2.6 High-Current Adjustable Regulator
- 9.2.7 Emitter-Follower Current Amplifier
- 9.2.8 1-A Current Regulator
- 9.2.9 Common-Emitter Amplifier
- 9.2.10 Low-Cost 3-A Switching Regulator
- 9.2.11 Current-Limited Voltage Regulator
- 9.2.12 Adjusting Multiple On-Card Regulators With Single Control
- 9.2.13 AC Voltage Regulator
- 9.2.14 12-V Battery Charger
- 9.2.15 Adjustable 4-A Regulator
- 9.2.16 Current-Limited 6-V Charger
- 9.2.17 Digitally Selected Outputs
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
訂購信息
9.2.15 Adjustable 4-A Regulator
Using three LM317-N devices in parallel increases load current capability (Figure 33). Output voltage is set by the variable resistor tied to the non-inverting 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