LM5034
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SNVS347A –FEBRUARY 2005–REVISED APRIL 2013
LM5034 High Voltage Dual Interleaved Current Mode Controller with Active Clamp
Check for Samples: LM5034
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FEATURES
APPLICATIONS
2
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Two Independent PWM Current Mode
Controllers
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•
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Telecommunication Power Converters
Industrial Power Converters
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•
•
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Integrated High Voltage Startup Regulator
Compound 2.5A Main Output Gate Drivers
Single Resistor Oscillator Setting to 2 MHz
Synchronizable Oscillator
+42V Automotive Systems
DESCRIPTION
The LM5034 dual current mode PWM controller
contains all the features needed to control either two
independent forward/active clamp dc/dc converters or
a single high current converter comprised of two
interleaved power stages. The two controller
channels operate 180° out of phase thereby reducing
input ripple current. The LM5034 includes a startup
regulator that operates over a wide input range up to
100V and compound (bipolar + CMOS) gate drivers
that provide a robust 2.5A peak sink current. The
adjustable dead-time of the active clamp gate drivers
and adjustable maximum PWM duty cycle reduce
stress on the primary side MOSFET switches.
Additional features include programmable line under-
voltage lockout, cycle-by-cycle current limit, hiccup
mode fault operation with adjustable restart delay,
PWM slope compensation, soft-start, and a 2 MHz
capable oscillator with synchronization capability.
Active Clamp Gate Driver for P-Channel
MOSFETs
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Adjustable Gate Drive Overlap Time
Programmable Maximum Duty Cycle
Maximum Duty Cycle Fold-Back at High Line
Voltage
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Adjustable Timer for Hiccup Mode Current
Limiting
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Integrated Slope Compensation
Adjustable Line Under-Voltage Lockout
Independently Adjustable Soft-Start (Each
Regulator)
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Direct Interface with Opto-Coupler Transistor
Thermal Shutdown
PACKAGE
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TSSOP-20
Typical Application Circuit
V
CC
36V to 75V
Input
V
PWR
3.3V
VIN
CS1
LM5034
UVLO
RES
OUT1
AC1
ERROR AMP
& ISOLATION
RT
Sync
COMP1
CS2
DCL
2.5V
VCC1
VCC2
OUT2
AC2
ERROR AMP
& ISOLATION
SS2
SS1
OVLP
GND1
COMP2
GND2
Figure 1. Dual Interleaved Regulators with Independent Outputs
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2013, Texas Instruments Incorporated