JAJSGZ7A May   2015  – February 2019 UC1845A-SP

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
      2.      VREF放射線ドリフト曲線
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 UVLO
      2. 9.3.2 Reference
      3. 9.3.3 Totem-Pole Output
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Oscillator
        2. 10.2.2.2 Current Sensing and Limiting
        3. 10.2.2.3 Error Amplifier
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Feedback Traces
      2. 12.1.2 Input/Output Capacitors
      3. 12.1.3 Compensation Components
      4. 12.1.4 Traces and Ground Planes
    2. 12.2 Layout Example
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 ドキュメントの更新通知を受け取る方法
    2. 13.2 コミュニティ・リソース
    3. 13.3 商標
    4. 13.4 静電気放電に関する注意事項
    5. 13.5 Glossary
  14. 14メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

11 Power Supply Recommendations

The devices are designed to operate from an input voltage supply range between 8 V and 40 V. This input supply should be well regulated. If the input supply is located more than a few inches from the UC1845A-SP converter, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. A tantalum capacitor with a value of 47 µF is a typical choice; however, this may vary depending upon the output power being delivered.

UC1845A-SP flyback_reg_LUSC14.gif
Power supply specifications:
  1. Input voltage: 95 VAC to 130 VAC (50 Hz/60 Hz)
  2. Line isolation: 3750 V
  3. Switching frequency: 40 kHz
  4. Efficiency full load: 70%
  5. Output voltage:
    1. +5 V, ±5%; 1- to 4-A load, ripple voltage: 50 mVP-P max
    2. +12 V, ±3%; 0.1- to 0.3-A load, ripple voltage: 100 mVP-P max
    3. –12 V, ±3%; 0.1- to 0.3-A load, ripple voltage: 100 mVP-P max
Figure 23. Offline Flyback Regulator