LM5035C Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – PWM Controller with Integrated Half-Bridge and SyncFET Drivers

LM5035C
January 19, 2010
PWM Controller with Integrated Half-Bridge and SyncFET
Drivers
General Description
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 half-
bridge PWM controller. The amplitude of the SR1 and SR2
waveforms are 5V instead of the V_cc 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 low-
side gate drivers are capable of 2A peak. An internal high
voltage startup regulator is included, along with pro-
grammable line undervoltage lockout (UVLO) and overvolt-
age 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 cur-
rent limit and adjustable hiccup mode overload protection.
Features
■ ^{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}
Packages
■ ^{TSSOP-20EP (Thermally enhanced)}
■ ^{LLP-24 (4mm x 5mm)}
Simplified Application Diagram
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