JAJSGH4A November   2018  – July 2019 LM25180-Q1

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション
      2.      標準的な効率、VOUT = 5V
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 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. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Integrated Power MOSFET
      2. 8.3.2  PSR Flyback Modes of Operation
      3. 8.3.3  Setting the Output Voltage
        1. 8.3.3.1 Diode Thermal Compensation
      4. 8.3.4  Control Loop Error Amplifier
      5. 8.3.5  Precision Enable
      6. 8.3.6  Configurable Soft Start
      7. 8.3.7  External Bias Supply
      8. 8.3.8  Minimum On-Time and Off-Time
      9. 8.3.9  Overcurrent Protection
      10. 8.3.10 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Active Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 5 V, 1 A
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Custom Design With WEBENCH® Tools
          2. 9.2.1.2.2  Custom Design With Excel Quickstart Tool
          3. 9.2.1.2.3  Flyback Transformer – T1
          4. 9.2.1.2.4  Flyback Diode – DFLY
          5. 9.2.1.2.5  Zener Clamp Circuit – DF, DCLAMP
          6. 9.2.1.2.6  Output Capacitor – COUT
          7. 9.2.1.2.7  Input Capacitor – CIN
          8. 9.2.1.2.8  Feedback Resistor – RFB
          9. 9.2.1.2.9  Thermal Compensation Resistor – RTC
          10. 9.2.1.2.10 UVLO Resistors – RUV1, RUV2
          11. 9.2.1.2.11 Soft-Start Capacitor – CSS
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –7.7 V at 200 mA
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Flyback Transformer – T1
          2. 9.2.2.2.2 Flyback Diodes – DFLY1 and DFLY2
          3. 9.2.2.2.3 Input Capacitor – CIN
          4. 9.2.2.2.4 Feedback Resistor – RFB
          5. 9.2.2.2.5 UVLO Resistors – RUV1, RUV2
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Design 3: PSR Flyback Converter With Stacked Dual Outputs of 24 V and 5 V
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Flyback Transformer – T1
          2. 9.2.3.2.2 Feedback Resistor – RFB
          3. 9.2.3.2.3 UVLO Resistors – RUV1, RUV2
        3. 9.2.3.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 12.1.2 開発サポート
      3. 12.1.3 WEBENCH® ツールによるカスタム設計
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 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

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • NGU|8
サーマルパッド・メカニカル・データ
発注情報

9.2.3.1 Design Requirements

The required input, output, and performance parameters for this application example are shown in Table 5.

Table 5. Design Parameters

DESIGN PARAMETER VALUE
Input voltage range (steady state) 8.5 V to 42 V
Output 1 voltage and current 24 V, 0.1 A
Output 2 voltage and current 5 V, 0.3 A
Input UVLO thresholds 8 V on, 7 V off
Output voltage regulation ±2%

The target full-load efficiency of this LM25180-Q1 design is 88% based on a nominal input voltage of 24 V and isolated output voltages of 24 V and 5 V. The selected flyback converter components are cited in Table 6, including multi-winding flyback transformer, input and output capacitors, rectifying diodes, and converter IC.

Table 6. List of Components for Design 3

REF DES QTY SPECIFICATION VENDOR PART NUMBER
CIN, COUT1 2 10 µF, 50 V, X7R, 1210, ceramic, AEC-Q200 Taiyo Yuden UMJ325KB7106KMHT
10 µF, 50 V, X7S, 1210, ceramic, AEC-Q200 TDK CGA6P3X7S1H106M
COUT2 1 47 µF, 10 V, X7R, 1210, ceramic, AEC-Q200 Murata GCM32EC71A476KE02
DFLY1 1 Switching diode, fast recovery, 200 V, 1 A, SOD-123 DFLU1200 Diodes Inc.
DFLY2 1 Schottky diode, 40 V, 1 A, SOD-123 B140HW Diodes Inc.
DCLAMP 1 Zener, 22 V, 1 W, PowerDI-123, AEC-Q101 DFLZ22-7 Diodes Inc.
DF 1 Switching diode, 75 V, 0.25 A, SOD-323 CMDD4448 Central Semi
DOUT1 1 Zener, 27 V, 2%, SOD-523, AEC-Q101 BZX585-B27 Nexperia
DOUT2 1 Zener, 5.6 V, 2%, SOD-523, AEC-Q101 BZX585-B5V6 Nexperia
RFB 1 130 kΩ, 1%, 0402 Std Std
RSET 1 12.1 kΩ, 1%, 0402 Std Std
RTC 1 301 kΩ, 1%, 0402 Std Std
RUV1 1 147 kΩ, 1%, 0603 Std Std
RUV2 1 34 kΩ, 1%, 0402 Std Std
T1 1 30 µH, 2 A, turns ratio 1 : 1.5 : 0.4, 9 × 10 mm, SMT Coilcraft YA8864-BLD
30 µH, 2 A, turns ratio 1 : 1 : 0.55, 9 × 10 mm, SMT Coilcraft YA8916-BLD
Würth Electronik 750317595
U1 1 LM25180-Q1 PSR flyback converter, AEC-Q100 Texas Instruments LM25180QNGURQ1