ZHCSBB6H April   2012  – November 2017 LM34927

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Control Overview
      2. 7.3.2  VCC Regulator
      3. 7.3.3  Regulation Comparator
      4. 7.3.4  Overvoltage Comparator
      5. 7.3.5  On-Time Generator
      6. 7.3.6  Current Limit
      7. 7.3.7  N-Channel Buck Switch and Driver
      8. 7.3.8  Synchronous Rectifier
      9. 7.3.9  Undervoltage Detector
      10. 7.3.10 Thermal Protection
      11. 7.3.11 Ripple Configuration
      12. 7.3.12 Soft Start
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Application Circuit: 20-V to 95-V Input and 10-V, 300-mA Output Isolated Fly-Buck Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Transformer Turns Ratio
          2. 8.2.1.2.2  Total IOUT
          3. 8.2.1.2.3  RFB1, RFB2
          4. 8.2.1.2.4  Frequency Selection
          5. 8.2.1.2.5  Transformer Selection
          6. 8.2.1.2.6  Primary Output Capacitor
          7. 8.2.1.2.7  Secondary Output Capacitor
          8. 8.2.1.2.8  Type III Feedback Ripple Circuit
          9. 8.2.1.2.9  Secondary Diode
          10. 8.2.1.2.10 VCC and Bootstrap Capacitor
          11. 8.2.1.2.11 Input Capacitor
          12. 8.2.1.2.12 UVLO Resistors
          13. 8.2.1.2.13 VCC Diode
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Curves
  11. 11器件和文档支持
    1. 11.1 接收文档更新通知
    2. 11.2 社区资源
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 Glossary
  12. 12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

6.7 Typical Characteristics

LM34927 30177904.png
Figure 1. Efficiency at 750 kHz, VOUT1 = 10 V
LM34927 30177906.png
Figure 3. VCC vs ICC
LM34927 30177905.png
Figure 2. VCC vs VIN
LM34927 30177907.png
Figure 4. ICC vs External VCC
LM34927 Graph - On-time vs Vin.png
Figure 5. TON vs VIN and RON
LM34927 30177910.png
Figure 7. IIN vs VIN (Operating, Non-switching)
LM34927 tc_efficiency_snvs799.png
Figure 9. Efficiency
LM34927 buck_transient_response_36Vin_02_snvs799.png
Figure 11. Buck Transient Response 36 VIN
LM34927 buck_transient_response_48Vin_02_snvs799.png
Figure 13. Buck Transient Response 48 VIN
LM34927 buck_transient_response_72Vin_02_snvs799.png
LM34927 30177909.png
Figure 6. TOFF (ILIM) vs VFB and VIN
LM34927 30177911.png
Figure 8. IIN vs VIN (Shutdown)
LM34927 buck_transient_response_36Vin_01_snvs799.png
Figure 10. Buck Transient Response 36 VIN
LM34927 buck_transient_response_48Vin_01_snvs799.png
Figure 12. Buck Transient Response 48 VIN
LM34927 buck_transient_response_72Vin_01_snvs799.png
Figure 14. Buck Transient Response 72 VIN