LM5035C：PWM Controller with Integrated Half-Bridge and SyncFET Drivers
The LM5035C 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 LM5035C is a functional variant of the LM5035B halfbridge PWM controller. The amplitude of the SR1 and SR2 waveforms are 5V 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 105V. Both the high-side and lowside gate drivers are capable of 2A peak. An internal high voltage startup 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 2MHz. 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.
■ 105V / 2A Half-Bridge Gate Drivers
■ Synchronous Rectifier Control Outputs with Programmable Delays
■ Reduced Deadtime Between High and Low Side Drive for Higher Maximum Duty Cycle.
■ High Voltage (105V) Start-up Regulator
■ Voltage mode Control with Line Feed-Forward and Volt Second Limiting
■ Resistor Programmed, 2MHz Capable Oscillator
■ Programmable Line Under-Voltage Lockout and 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
■ Logic level Synchronous Rectifier Drives
■ 5V Reference Output
■ TSSOP-20EP (Thermally enhanced)
■ LLP-24 (4mm x 5mm)
The LM5035C evaluation board is designed to provide the design engineer with a fully functional power converter based on the Half Bridge topology to evaluate the LM5035C controller.
The LM5035C is a functional variant of the LM5035B Half- Bridge PWM Controller. The amplitude of the SR control signals are 5V instead of the VCC level. The evaluation board
is provided in an industry standard quarter-brick footprint.
The performance of the evaluation board is as follows:
■ Input operating range: 36V to 75V
■ Output voltage: 3.3V
■ Output current: 0 to 30A
■ Measured efficiency: 89% at 30A, 92% at 15A
■ Frequency of operation: 400 kHz
■ Board size: 2.28 x 1.45 x 0.5 inches
■ Load Regulation: 0.2%
■ Line Regulation: 0.1%
■ Line UVLO (33.9V/31.9V on/off)
■ Line OVP (79.4V/78.3V off/on)
■ Hiccup current limit
图5。LM5035C应用电路: 输入36-75V，输出3.3V 30A