SNVS783K January   2012  – August 2021 LM5017

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Timing Requirements
    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 Application
      1. 8.2.1 Application Circuit: 12.5-V to 95-V Input and 10-V, 600-mA Output Buck Converter
        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 RFB1, RFB2
          3. 8.2.1.2.3 Frequency Selection
          4. 8.2.1.2.4 Inductor Selection
          5. 8.2.1.2.5 Output Capacitor
          6. 8.2.1.2.6 Type III Ripple Circuit
          7. 8.2.1.2.7 VCC and Bootstrap Capacitors
          8. 8.2.1.2.8 Input Capacitor
          9. 8.2.1.2.9 UVLO Resistors
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Isolated DC/DC Converter Using LM5017
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1  Transformer Turns Ratio
          2. 8.2.2.2.2  Total IOUT
          3. 8.2.2.2.3  RFB1, RFB2
          4. 8.2.2.2.4  Frequency Selection
          5. 8.2.2.2.5  Transformer Selection
          6. 8.2.2.2.6  Primary Output Capacitor
          7. 8.2.2.2.7  Secondary Output Capacitor
          8. 8.2.2.2.8  Type III Feedback Ripple Circuit
          9. 8.2.2.2.9  Secondary Diode
          10. 8.2.2.2.10 VCC and Boostrap Capacitor
          11. 8.2.2.2.11 Input Capacitor
          12. 8.2.2.2.12 UVLO Resistors
          13. 8.2.2.2.13 VCC Diode
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range, unless otherwise stated. VIN = 48 V, unless otherwise stated. See(1)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VCC SUPPLY
VCCVCC regulator outputVIN = 48 V, ICC = 20 mA6.257.68.55V
ILIM-VCCVCC current limitVIN = 48 V(2)26mA
VCC-UVVCC undervoltage lockout voltage (VVCC increasing)–40°C ≤ TJ ≤ 125°C4.154.54.9V
VCC-UV-HYSVCC undervoltage hysteresis300mV
VCC-LDOVIN – VCC dropout voltageVIN = 9 V, ICC = 20 mA2.3V
IOPIIN operating currentNon-switching, VFB = 3 V1.75mA
ISHDIIN shutdown currentVUVLO = 0 V50225µA
SWITCH CHARACTERISTICS
RDS(ON)1Buck switch RDS(on)ITEST = 200 mA, VBST – VSW = 7 V0.81.8Ω
RDS(ON)2Synchronous switch RDS(on)ITEST = 200 mA0.451Ω
BSTUVGate drive UVLOVBST − VSW rising2.433.6V
BSTUV-HYSGate drive UVLO hysteresis260mV
CURRENT LIMIT
ILIM-HSCurrent limit threshold–40°C ≤ TJ ≤ 125°C0.71.021.3A
tRESCurrent limit response timeTime to switch off150ns
tOFF1OFF-time generator (test 1)VFB = 0.1 V, VIN = 48 V12µs
tOFF2OFF-time generator (test 2)VFB = 1 V, VIN = 48 V2.5µs
REGULATION AND OVERVOLTAGE COMPARATORS
VFBFB regulation levelInternal reference trip point for switch ON1.21.2251.25V
VFB-OVFB overvoltage thresholdTrip point for switch OFF1.62V
IFB-BIASFB bias current60nA
UNDERVOLTAGE SENSING FUNCTION
VUVLO-THUVLO thresholdVoltage at UVLO rising1.191.2251.26V
IUVLO-HYSUVLO hysteresis input currentVUVLO = 2.5 V–10–20–29µA
VSD-THRemote shutdown thresholdVoltage at UVLO falling0.320.66V
VSD-HYSRemote shutdown hysteresis110mV
THERMAL SHUTDOWN
TSDThermal shutdown temperature165°C
TSD-HYSThermal shutdown hysteresis20°C
(1) All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
(2) VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.