ZHCSYA6D May   1998  – May 2025 LM138 , LM338

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics: LM138
    5. 5.5 Electrical Characteristics: LM338
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 NPN Darlington Output Drive
      2. 6.3.2 Overload Block
      3. 6.3.3 Programmable Feedback
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Operation With Low Input Voltage
      3. 6.4.3 Operation at Light Loads
      4. 6.4.4 Operation in Self Protection
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Constant 5-V Regulator
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 External Capacitors
          2. 7.2.1.2.2 Load Regulation
          3. 7.2.1.2.3 Protection Diodes
        3. 7.2.1.3 Application Curves
    3. 7.3 System Examples
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 接收文档更新通知
    2. 8.2 支持资源
    3. 8.3 Trademarks
    4. 8.4 静电放电警告
    5. 8.5 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.3 System Examples

LM138 LM338 Regulator and Voltage Reference Figure 7-8 Regulator and Voltage Reference
LM138 LM338 1.2-V to 25-V Adjustable Regulator Figure 7-9 1.2-V to 25-V Adjustable Regulator
LM138 LM338 Temperature Controller
Full output current not available at high input-output voltages †Optional—improves transient response. Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients. *Needed if device is more than 6 inches from filter capacitors. LM138 LM338 **R1 = 240 Ω for LM138. R1, R2 as an assembly can be ordered from Bourns: MIL part no. 7105A-AT2-502 COMM part no. 7105A-AT7-502
Figure 7-10 Temperature Controller
LM138 LM338 Precision Power Regulator With Low Temperature Coefficient
* Adjust for 3.75 across R1
Figure 7-11 Precision Power Regulator With Low Temperature Coefficient
LM138 LM338 Slow Turnon 15-V Regulator Figure 7-12 Slow Turnon 15-V Regulator
LM138 LM338 Adjustable Regulator With Improved Ripple Rejection
†Solid tantalum *Discharges C1 if output is shorted to ground **R1 = 240 Ω for LM138
Figure 7-13 Adjustable Regulator With Improved Ripple Rejection
LM138 LM338 High Stability 10-V Regulator Figure 7-14 High Stability 10-V Regulator
LM138 LM338 Digitally Selected Outputs
*Sets maximum VOUT **R1 = 240 Ω for LM138
Figure 7-15 Digitally Selected Outputs
LM138 LM338 15-A Regulator
* Minimum load—100 mA
Figure 7-16 15-A Regulator
LM138 LM338 5-V Logic Regulator With Electronic Shutdown**
** Minimum output ≈ 1.2 V
Figure 7-17 5-V Logic Regulator With Electronic Shutdown**
LM138 LM338 Light Controller Figure 7-18 Light Controller
LM138 LM338 0 to 22-V Regulator
* R1 = 240 Ω, R2 = 5k for LM138 Full output current not available at high input-output voltages
Figure 7-19 0 to 22-V Regulator
LM138 LM338 12-V Battery Charger Figure 7-20 12-V Battery Charger
LM138 LM338 Adjustable Current Regulator Figure 7-21 Adjustable Current Regulator
LM138 LM338 Precision Current Limiter Figure 7-22 Precision Current Limiter
LM138 LM338 5-A Current Regulator Figure 7-23 5-A Current Regulator
LM138 LM338 Tracking Preregulator Figure 7-24 Tracking Preregulator
LM138 LM338 Adjusting Multiple On-Card Regulators With Single Control*
† Minimum load—10 mA * All outputs within ±100 mV
Figure 7-25 Adjusting Multiple On-Card Regulators With Single Control*
LM138 LM338 Power Amplifier
AV = 1, RF = 10k, CF = 100 pF AV = 10, RF = 100k, CF = 10 pF Bandwidth ≥ 100 kHz Distortion ≤ 0.1%
Figure 7-26 Power Amplifier
LM138 LM338 Simple 12-V Battery Charger
LM138 LM338 Use of RS allows low charging rates with fully charged battery. **The 1000 µF is recommended to filter out input transients LM138 LM338 Use of RS allows low charging rates with fully charged battery. **The 1000 µF is recommended to filter out input transients
Figure 7-27 Simple 12-V Battery Charger
LM138 LM338 Adjustable 15-A Regulator Figure 7-28 Adjustable 15-A Regulator
LM138 LM338 Current Limited 6-V Charger
* Set max charge current to 3 A ** The 1000 µF is recommended to filter out input transients.
Figure 7-29 Current Limited 6-V Charger
LM138 LM338 10-A Regulator
* Minimum load—100 mA
Figure 7-30 10-A Regulator