LM5045 Texas instruments

LM5045

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LM5045

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Описание

The LM5045 PWM controller contains all of the features necessary to implement full-bridge topology power converters using either current mode or voltage mode control. This device is intended to operate on the primary side of an isolated DC-DC converter with input voltage up to 100 V. This highly integrated controller-driver provides dual 2-A high-side and low-side gate drivers for the four external bridge MOSFETs plus control signals for the secondary-side synchronous rectifier MOSFETs. External resistors program the leading and trailing edge dead-time between the main and synchronous rectifier control signals. Intelligent start-up of the synchronous rectifiers allows monotonic turnon of the power converter even with prebias load conditions. Additional features include cycle-by-cycle current limiting, hiccup mode restart, programmable soft-start, synchronous rectifier soft-start, and a 2-MHz capable oscillator with synchronization capability and thermal shutdown.

Highest Integration Controller for Small Form
Factor, High-Density Power Converters
High-Voltage Start-Up Regulator
Intelligent Sync Rectifier Start-Up Allows Linear
Turnon Into Prebiased Loads
Synchronous Rectifiers Disabled in UVLO mode and
Hiccup Mode
Two Independent, Programmable Synchronous Rectifier
Dead-Time Adjustments
Four High-Current 2-A Bridge Gate Drivers
Wide-Bandwidth Optocoupler Interface
Configurable for Either Current Mode or Voltage
Mode Control
Dual-Mode Overcurrent Protection
Resistor Programmed 2-MHz Oscillator
Programmable Line UVLO and OVP

Topology	Full bridge, Half bridge, Push pull
Control mode	Current
Duty cycle (max) (%)	50
Switching frequency (max) (kHz)	2000
Features	Current limiting, High-voltage startup, Integrated gate drivers, Multi-topology, SR logic, Synchronization pin
UVLO thresholds on/off (V)	Programmable/1.25V
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Gate drive (typ) (A)	1.5, 2
Vin (max) (V)	14