LM5035C
UVLO
AGND
PGND
COMP
HO
LO
SS
RT
RAMP
VIN
OVP
SR1
SR2
V
PWR
ERROR AMP
AND
ISOLATION
V
OUT
GATE
DRIVE
ISOLATION
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM5035C
SNVS631D –JANUARY 2010–REVISED OCTOBER 2016
LM5035C PWM Controller With Integrated Half-Bridge and SyncFET Drivers
1
1 Features
1
• 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 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
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
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