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
9.3.8 Slow Turn-On 15-V Regulator Circuit
The capacitor C1, in combination with the PNP transistor, helps the circuit to slowly start supplying voltage. In the beginning, the capacitor is not charged. Therefore output voltage starts at VC1+ VBE + 1.25 V = 0 V + 0.65 V + 1.25 V = 1.9 V. As the capacitor voltage rises, VOUT rises at the same rate. When the output voltage reaches the value determined by R1 and R2, the PNP will be turned off.
Figure 19. Slow Turn-On 15-V Regulator Circuit