JAJS137I NOVEMBER   2006  – November 2016 DCH010505D , DCH010505S , DCH010512D , DCH010512S , DCH010515D , DCH010515S

PRODUCTION DATA.  

  1. 特長
  2. アプリケーション
  3. 概要
  4. 改訂履歴
  5. Device Comparison Tables
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
      1. 8.1.1 Repeated High-Voltage Isolation Testing
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Isolation
        1. 8.3.1.1 Operation or Functional Isolation
        2. 8.3.1.2 Basic or Enhanced Isolation
        3. 8.3.1.3 Continuous Voltage
        4. 8.3.1.4 Isolation Voltage
        5. 8.3.1.5 Repeated High-Voltage Isolation Testing
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Optional Input and Output Filters
        1. 9.1.1.1 Input and Output Capacitors
        2. 9.1.1.2 π Filters
      2. 9.1.2 Start-Up
      3. 9.1.3 Connecting the DCH01 in Series
      4. 9.1.4 Connecting the DCH01 in Parallel
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Input Capacitor
        2. 9.2.2.2 Output Capacitor
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 関連リンク
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 コミュニティ・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13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

Detailed Description

Overview

The DCH01 series of DC/DC converters are 100% production tested at 3.5 kVDC for 1 second. The isolation test voltage represents an operational isolation to transient voltages and must not be relied upon for safety isolation.

The continuous voltage that can be applied across the DCH01 during normal operation must be < 60 VDC (within SELV limits).

Repeated High-Voltage Isolation Testing

Repeated high-voltage isolation testing can degrade the isolation capability of the DCH01.

Functional Block Diagrams

DCH010505D DCH010505S DCH010512D DCH010512S DCH010515D DCH010515S fbd_bvs073.gif Figure 20. Single-Output Block Diagram
DCH010505D DCH010505S DCH010512D DCH010512S DCH010515D DCH010515S fbd_dual_bvs073.gif Figure 21. Dual-Output Block Diagram

Feature Description

Isolation

Underwriters Laboratories (UL)™ defines several classes of isolation that are used in modern power supplies.

Safety extra low voltage (SELV) is defined by UL (UL1950 E199929) as a secondary circuit which is so designated and protected that under normal and single fault conditions the voltage between any two accessible parts, or between an accessible part and the equipment earthing terminal for operational isolation does not exceed steady state 42-V peak or 60 VDC for more than 1 second.

Operation or Functional Isolation

Operational or functional isolation is defined by the use of a high-potential (hipot) test only. Typically, this isolation is defined as the use of insulated wire in the construction of the transformer as the primary isolation barrier. The hipot one-second duration test (dielectric voltage, withstand test) is a production test used to verify that the isolation barrier is functioning. Products with operational isolation must never be used as an element in a safety-isolation system.

Basic or Enhanced Isolation

Basic or enhanced isolation is defined by specified creepage and clearance limits between the primary and secondary circuits of the power supply. Basic isolation is the use of an isolation barrier in addition to the insulated wire in the construction of the transformer. Input and output circuits must also be physically separated by specified distances.

Continuous Voltage

For a device that has no specific safety agency approvals (operational isolation), the continuous voltage that can be applied across the part in normal operation is less than 42.4 VRMS or 60 VDC. Ensure that both input and output voltages maintain normal SELV limits. The isolation test voltage represents a measure of immunity to transient voltages.

WARNING

Do not use the device as an element of a safety isolation system when SELV is exceeded.

If the device is expected to function correctly with more than 42.4 VRMS or 60 VDC applied continuously across the isolation barrier, then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage. Further isolation or insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements.

Isolation Voltage

Hipot test, flash-tested, withstand voltage, proof voltage, dielectric withstand voltage, and isolation test voltage are all terms that relate to the same thing: a test voltage applied for a specified time across a component designed to provide electrical isolation to verify the integrity of that isolation. TI’s DCH01 series of dc-dc converters are all 100% production tested at 3.5 kVDC for 1 second.

Repeated High-Voltage Isolation Testing

Repeated high-voltage isolation testing of a barrier component can degrade the isolation capability, depending on materials, construction, and environment. The DCH01 series of dc-dc converters have toroidal, enameled, wire isolation transformers with no additional insulation between the primary and secondary windings. While a device can be expected to withstand several times the stated test voltage, the isolation capability depends on the wire insulation. Any material, including this enamel (typically polyurethane), is susceptible to eventual chemical degradation when subject to very-high applied voltages. Therefore, strictly limit the number of high-voltage tests and repeated high-voltage isolation testing. However, if it is absolutely required, reduce the voltage by 20% from specified test voltage with a duration limit of 1 second per test.