ZHCSLI5 September   2020 LM34966-Q1

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 说明（续）
  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  Line Undervoltage Lockout (UVLO/SYNC/EN Pin)
      2. 8.3.2  High Voltage VCC Regulator (BIAS, VCC Pin)
      3. 8.3.3  Soft Start (SS Pin)
      4. 8.3.4  Switching Frequency (RT Pin)
      5. 8.3.5  Clock Synchronization (UVLO/SYNC/EN Pin)
      6. 8.3.6  Current Sense and Slope Compensation (CS Pin)
      7. 8.3.7  Current Limit and Minimum On-time (CS Pin)
      8. 8.3.8  Feedback and Error Amplifier (FB, COMP Pin)
      9. 8.3.9  Power-Good Indicator (PGOOD Pin)
      10. 8.3.10 Hiccup Mode Overload Protection
      11. 8.3.11 Maximum Duty Cycle Limit and Minimum Input Supply Voltage
      12. 8.3.12 MOSFET Driver (GATE Pin)
      13. 8.3.13 Overvoltage Protection (OVP)
      14. 8.3.14 Thermal Shutdown (TSD)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Run Mode
  9. 9 Application and Implementation
    1. 9.1 Power-On Hours (POH)
    2. 9.2 Application Information
    3. 9.3 Typical Application
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Custom Design With WEBENCH® Tools
        2. 9.3.2.2 Recommended Components
        3. 9.3.2.3 Inductor Selection (LM)
        4. 9.3.2.4 Output Capacitor (COUT)
        5. 9.3.2.5 Input Capacitor
        6. 9.3.2.6 MOSFET Selection
        7. 9.3.2.7 Diode Selection
        8. 9.3.2.8 Efficiency Estimation
      3. 9.3.3 Application Curve
    4. 9.4 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 第三方产品免责声明
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design With WEBENCH® Tools
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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订购信息

7.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over TJ = -40°C to 150°C. Unless otherwise stated, VBIAS = 12 V, RT = 220 kΩ
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
SUPPLY CURRENT
ISHUTDOWN(BIAS)BIAS shutdown currentVBIAS = 12 V, VUVLO = 0 V2.66μA
IOPERATING(BIAS)BIAS operating currentVBIAS = 12 V, VUVLO = 2.0 V, VFB = VREF, RT = 220 kΩ4901200μA
VCC REGULATOR
VVCC-REGVCC regulationVBIAS = 8 V, No load6.56.857V
VCC regulationVBIAS = 8 V, IVCC = 35 mA6.5V
VVCC-UVLO(RISING)VCC UVLO thresholdVCC rising2.752.852.95V
VCC UVLO hysteresisVCC falling0.063V
IVCC-CLVCC sourcing current limitVBIAS = 10 V, VVCC = 0 V20110mA
ENABLE
VEN(RISING)Enable thresholdEN rising0.40.520.7V
VEN(FALLING)Enable thresholdEN falling0.330.490.63V
VEN(HYS)Enable hysteresisEN falling0.03V
UVLO/SYNC
VUVLO(RISING)UVLO / SYNC thresholdUVLO rising1.4251.51.575V
VUVLO(FALLING)UVLO / SYNC thresholdUVLO falling1.3701.451.520V
VUVLO(HYS)UVLO / SYNC threshold hysteresisUVLO falling0.05V
IUVLOUVLO hysteresis currentVUVLO = 1.6 V456μA
SS
ISSSoft-start current91011μA
SS pull-down switch rDS(on)55Ω
PULSE WIDTH MODULATION
fswSwitching frequencyRT = 220 kΩ, VBIAS = 4 V85100115kHz
DMAXMaximum duty cycle limitRT = 220 kΩ, VBIAS = 4 V909396%
CURRENT SENSE
ISLOPEPeak slope compensation currentRT = 220 kΩ22.53037.5μA
VCLTHCurrent Limit threshold (CS-PGND)93100107mV
HICCUP MODE PROTECTION
Hiccup enable cycles64Cycles
Hiccup timer reset cycles8Cycles
ERROR AMPLIFIER
VREFFB reference0.9911.01V
GmTransconductance2mA/V
COMP sourcing currentVCOMP = 1.2V180μA
COMP clamp voltageCOMP rising (VUVLO = 2.0 V)2.52.8V
COMP clamp voltageCOMP falling11.15V
OVP
VOVTHOver-voltage thresholdFB rising (in reference to VREF)107110113%
Over-voltage thresholdFB falling (in reference to VREF)105%
PGOOD
PGOOD pull-down switch rDS(on)1 mA sinking90Ω
VUVTHUnder-voltage thresholdFB falling (in reference to VREF)879093%
Under-voltage thresholdFB rising (in reference to VREF)95%
MOSFET DRIVER
High-state voltage drop100 mA sinking0.25V
Low-state voltage drop100 mA sourcing0.15V
THERMAL SHUTDOWN
TTSDThermal shutdown thresholdTemperature rising175°C
Thermal shutdown hysteresis15°C