SNVS039J June 2000 – April 2015 LM1086
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 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 1.2-V to 15-V Adjustable Regulator
- 8.2.2 Adjustable at 5 V
- 8.2.3 5-V Regulator with Shutdown
- 8.2.4 Battery Charger
- 8.2.5 Adjustable Fixed Regulator
- 8.2.6 Regulator With Reference
- 8.2.7 High Current Lamp Driver Protection
- 8.2.8 Battery Backup Regulated Supply
- 8.2.9 Ripple Rejection Enhancement
- 8.2.10 Automatic Light Control
- 8.2.11 Remote Sensing
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
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订购信息
7.4.3 Protection Diodes
Under normal operation, the LM1086 regulator does not need any protection diode. With the adjustable device, the internal resistance between the adjustment and output terminals limits the current. No diode is needed to divert the current around the regulator even with a capacitor on the adjustment terminal. The adjust pin can take a transient signal of ±25 V with respect to the output voltage without damaging the device.
When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regulator, and rate of decrease of VIN. In the LM1086 regulator, the internal diode between the output and input pins can withstand microsecond surge currents of 10 A to 20 A. With an extremely large output capacitor (≥1000 µf), and with input instantaneously shorted to ground, the regulator could be damaged. In this case, an external diode is recommended between the output and input pins to protect the regulator, shown inFigure 17.
Figure 17. Regulator with Protection Diode