SNVS631D January   2010  – October 2016 LM5035C

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and 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  High-Voltage Start-Up Regulator
      2. 8.3.2  Line Undervoltage Detector
      3. 8.3.3  Line Overvoltage, Load Overvoltage, and Remote Thermal Protection
      4. 8.3.4  Reference
      5. 8.3.5  Cycle-by-Cycle Current Limit
      6. 8.3.6  Overload Protection Timer
      7. 8.3.7  Soft Start
      8. 8.3.8  PWM Comparator
      9. 8.3.9  Feedforward Ramp and Volt • Second Clamp
      10. 8.3.10 Oscillator, Sync Capability
      11. 8.3.11 Gate Driver Outputs (HO and LO)
      12. 8.3.12 Synchronous Rectifier Control Outputs (SR1 and SR2)
      13. 8.3.13 Thermal Protection
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 VIN
        2. 9.2.2.2 For Applications >100 V
        3. 9.2.2.3 Current Sense
        4. 9.2.2.4 HO, HB, HS, and LO
        5. 9.2.2.5 Programmable Delay (DLY)
        6. 9.2.2.6 UVLO and OVP Voltage Divider Selection For R1, R2, and R3
        7. 9.2.2.7 Fault Protection
        8. 9.2.2.8 Hiccup Mode Current Limit Restart (RES)
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resource
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • 105-V and 2-A Half-Bridge Gate Drivers
  • Synchronous Rectifier Control Outputs With Programmable Delays
  • Reduced Dead Time Between High and Low-Side Drive for Higher Maximum Duty Cycle.
  • High Voltage (105 V) Start-Up Regulator
  • Voltage Mode Control With Line Feedforward and Volt Second Limiting
  • Resistor Programmed, 2-MHz Capable Oscillator
  • Programmable Line Undervoltage Lockout and Overvoltage Protection
  • Internal Thermal Shutdown Protection
  • Adjustable Soft Start
  • Versatile Dual Mode Overcurrent Protection With Hiccup Delay Timer
  • Cycle-by-Cycle Overcurrent Protection
  • Direct Opto-coupler Interface
  • Logic Level Synchronous Rectifier Drives
  • 5-V Reference Output
  • Packages:
    • HTSSOP-20 (Thermally Enhanced)
    • WQFN-24 (4mm × 5mm)

2 Applications

  • Industrial Power Converters
  • Telecom Power Converters

3 Description

The LM5035C half-bridge controller and gate driver contains all of the features necessary to implement half-bridge topology power converters using voltage mode control with line voltage feedforward.

The LM5035C is a functional variant of the LM5035B half-bridge PWM controller. The amplitude of the SR1 and SR2 waveforms are 5 V instead of the VCC level. Also, the soft-stop function is disabled in the LM5035C.

The LM5035, LM5035A, LM5035B, and LM5035C include a floating high-side gate driver, which is capable of operating with supply voltages up to
105 V. Both the high-side and low-side gate drivers are capable of 2-A peak. An internal high-voltage start-up regulator is included, along with programmable line undervoltage lockout (UVLO) and overvoltage protection (OVP). The oscillator is programmed with a single resistor to frequencies up to 2 MHz. The oscillator can also be synchronized to an external clock. A current sense input and a programmable timer provide cycle-by-cycle current limit and adjustable hiccup mode overload protection. The differences between LM5035, LM5035A, LM5035B, and LM5035C are summarized in the Device Comparison Table.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM5035C HTSSOP (20) 6.50 mm × 4.40 mm
WQFN (24) 5.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Application Diagram

LM5035C 30106801.gif