ZHCSFE2A August   2016  – November 2017 LM5161-Q1

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      典型降压应用电路
      2.      典型 Fly-Buck 应用电路
  4. 修订历史记录
  5. Pin Configuration and Functions
    1.     Pin Functions
  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. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Control Circuit
      2. 7.3.2  VCC Regulator
      3. 7.3.3  Regulation Comparator
      4. 7.3.4  Soft-Start
      5. 7.3.5  Error Transconductance (GM) Amplifier
      6. 7.3.6  On-Time Generator
      7. 7.3.7  Current Limit
      8. 7.3.8  N-Channel Buck Switch and Driver
      9. 7.3.9  Synchronous Rectifier
      10. 7.3.10 Enable / Undervoltage Lockout (EN/UVLO)
      11. 7.3.11 Thermal Protection
      12. 7.3.12 Ripple Configuration
    4. 7.4 Device Functional Modes
      1. 7.4.1 Forced Pulse Width Modulation (FPWM) Mode
      2. 7.4.2 Undervoltage Detector
  8. Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 LM5161-Q1 Synchronous Buck (15-V to 95-V Input, 12-V Output, 1-A Load)
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2  Output Resistor Divider Selection
          3. 8.2.1.2.3  Frequency Selection
          4. 8.2.1.2.4  Inductor Selection
          5. 8.2.1.2.5  Output Capacitor Selection
          6. 8.2.1.2.6  Series Ripple Resistor - RESR (FPWM = 1)
          7. 8.2.1.2.7  VCC and Bootstrap Capacitor
          8. 8.2.1.2.8  Input Capacitor Selection
          9. 8.2.1.2.9  Soft-Start Capacitor Selection
          10. 8.2.1.2.10 EN/UVLO Resistor Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 LM5161-Q1 Isolated Fly-Buck (36-V to 72-V Input, 12-V, 12-W Isolated Output)
        1. 8.2.2.1 LM5161-Q1 Fly-Buck Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Selection of VOUT and Turns Ratio
          2. 8.2.2.2.2 Secondary Rectifier Diode
          3. 8.2.2.2.3 External Ripple Circuit
          4. 8.2.2.2.4 Output Capacitor (CVISO)
        3. 8.2.2.3 Application Curves
    3. 8.3 Do's and Don'ts
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 使用 WEBENCH® 工具创建定制设计
    2. 11.2 相关文档
    3. 11.3 商标
    4. 11.4 接收文档更新通知
    5. 11.5 社区资源
    6. 11.6 静电放电警告
    7. 11.7 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

Typical Characteristics

At TA = 25°C and applicable to LM5161-Q1 unless otherwise noted.
LM5161-Q1 eff_3v3_fpwm0_SNVU504.gif
VOUT= 3.3 V RON= 110 kΩ
FPWM = 0
Figure 1. Efficiency at 300 kHz
LM5161-Q1 EFF_12VOUT_fpwm1_ext_vs_intVcc_SNVU504.gif
VOUT = 12 V RON = 402 kΩ
FPWM = 0 L = 100 µH
Figure 3. Efficiency at 300 kHz
LM5161-Q1 LineReg_extVcc_fpwm1_SNVU504.gif
VOUT = 12 V RON = 300 kΩ
FPWM = 1 L = 100 µH
Figure 5. Line Regulation
LM5161-Q1 Icc_vcc_SNVU504.gif
VIN = 48 V
Figure 7. VCC vs. ICC
LM5161-Q1 cl_fb_SNVU504.gif
Figure 9. TOFF (ILIM) vs. VFB
LM5161-Q1 ONTIME_12V_5V_SNVU504.gif
Figure 11. TON vs. VIN
LM5161-Q1 SD_VIN_SNVU504.gif
Figure 13. Shutdown Current vs. VIN
LM5161-Q1 VRON_VIN_R1_SNVU504.gif
Figure 15. Voltage at RON pin vs. Input Voltage
LM5161-Q1 Ref_TEMP_SNVU504.gif
VIN = 48 V
Figure 17. Reference Voltage vs. Temperature
LM5161-Q1 SD_TEMP_SNVU504.gif
VIN = 48 V
Figure 19. Input Shutdown Current vs. Temperature
LM5161-Q1 CL_TEMP_SNVU504.gif
VIN = 48 V
Figure 21. Current Limit vs. Temperature
LM5161-Q1 FPWM_TEMP_SNVU504.gif
VIN = 48 V
Figure 23. FPWM Threshold vs. Temperature
LM5161-Q1 Eff_5V_300k_CCMvsDCM_SNVU504.gif
VOUT= 5 V RON= 169 kΩ
L=47 µH
Figure 2. Efficiency at 300 kHz
LM5161-Q1 eff_VIN_12Vout_fpwm1_SNVU504.gif
VOUT = 12 V RON = 402 kΩ
FPWM = 1 L = 100 µH
Figure 4. Efficiency at 300 kHz
LM5161-Q1 Vcc_VIN_SNVU504.gif
Figure 6. VCC vs. VIN
LM5161-Q1 ICCvsExtVCC_SNVU504.gif
IOUT = 1 A FPWM = 0
Figure 8. ICC vs. External VCC
LM5161-Q1 OnTime_VIN_SNVU504.gif
Figure 10. TON vs. VIN
LM5161-Q1 Fsw_vs_VIN_R1_SNVU504.gif
VOUT = 12 V
Figure 12. FSW vs. VIN
LM5161-Q1 Operating_VIN_SNVU504.gif
VFB = 3 V
Figure 14. IIN vs. VIN (Operating, Non Switching)
LM5161-Q1 GD_UVLO_TEMP_SNVU504.gif
VIN = 48 V
Figure 16. Gate Drive UVLO vs. Temperature
LM5161-Q1 OP_TEMP_SNVU504.gif
VIN = 48 V
Figure 18. Input Operating Current vs. Temperature
LM5161-Q1 Vcc_UVLO_TEMP_SNVU504.gif
VIN = 48 V
Figure 20. VCC UVLO vs. Temperature
LM5161-Q1 sinkCL_TEMP_SNVU504.gif
VIN = 48 V
Figure 22. Sink Current Limit vs. Temperature
LM5161-Q1 RDSON_TEMP_SNVU504.gif
ISW = 500 mA VIN = 48 V
Figure 24. Switch Resistance vs. Temperature