ZHCSH33Y September 1997 – April 2020 LM317
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 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 Application
- 9.3
System Examples
- 9.3.1 0-V to 30-V Regulator Circuit
- 9.3.2 Adjustable Regulator Circuit With Improved Ripple Rejection
- 9.3.3 Precision Current-Limiter Circuit
- 9.3.4 Tracking Preregulator Circuit
- 9.3.5 1.25-V to 20-V Regulator Circuit With Minimum Program Current
- 9.3.6 Battery-Charger Circuit
- 9.3.7 50-mA Constant-Current Battery-Charger Circuit
- 9.3.8 Slow Turn-On 15-V Regulator Circuit
- 9.3.9 AC Voltage-Regulator Circuit
- 9.3.10 Current-Limited 6-V Charger Circuit
- 9.3.11 Adjustable 4-A Regulator Circuit
- 9.3.12 High-Current Adjustable Regulator Circuit
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息
9.3.5 1.25-V to 20-V Regulator Circuit With Minimum Program Current
Because the value of VREF is constant, the value of R1 determines the amount of current that flows through R1 and R2. The size of R2 determines the IR drop from ADJUSTMENT to GND. Higher values of R2 translate to higher VOUT.
Equation 2. 
Equation 3. 
Figure 16. 1.25-V to 20-V Regulator Circuit With Minimum Program Current