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LM5035AMH Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM5035AMH Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 30 page LM5035A/LM5035A-1 July 30, 2010 PWM Controller with Integrated Half-Bridge and SyncFET Drivers General Description The LM5035A Half-Bridge Controller/Gate Driver contains all of the features necessary to implement half-bridge topology power converters using voltage mode control with line voltage feed-forward. The LM5035A is a functional variant of the LM5035 half-bridge PWM controller. The VCC current limit threshold has been increased to 35 mA. The soft start and soft start currents have been increased from 50 µA to 100 µA. The BST UV threshold has been lowered to less than the VCC UV threshold. The ratio of the T1 and T2 delays on the SR1 and SR2 outputs has been increased from 2:1 to 3:1. The floating high-side gate driver is capable of operating with sup- ply voltages up to 105V. Both the high-side and low-side gate drivers are capable of 2A peak. An internal high voltage start- up regulator is included, along with programmable line un- dervoltage lockout (UVLO) and overvoltage protection (OVP). The oscillator is programmed with a single resistor to fre- quencies up to 2MHz. The oscillator can also be synchronized to an external clock. A current sense input and a pro- grammable timer provide cycle-by-cycle current limit and ad- justable hiccup mode overload protection. The differences between LM5035, LM5035A, LM5035B, and LM5035C are summarized in Table 2. Features ■ 105V / 2A Half-Bridge Gate Drivers ■ Synchronous Rectifier Control Outputs with Programmable Delays ■ High Voltage (105V) Start-up Regulator ■ Voltage mode Control with Line Feed-Forward and Volt • Second Limiting ■ Resistor Programmed, 2MHz Capable Oscillator ■ Patent Pending Oscillator Synchronization ■ Programmable Line Under-Voltage Lockout ■ Line Over-Voltage Protection ■ Internal Thermal Shutdown Protection ■ Adjustable Soft-Start ■ Versatile Dual Mode Over-Current Protection with Hiccup Delay Timer ■ Cycle-by-Cycle Over-Current Protection ■ Direct Opto-coupler Interface ■ 5V Reference Output Packages ■ TSSOP-20EP ■ LLP-24 (4mm x 5mm) ■ TSSOP-28EP (LM5035A-1 only) Simplified Application Diagram 30034101 © 2010 National Semiconductor Corporation 300341 www.national.com |
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