LM5046
- Highest Integration Controller for Small
Form Factor, High-Density Power Converters - High-Voltage Start-Up Regulator
- Intelligent Sync Rectifier Start-Up Allows
Linear Turn-on into Prebiased Loads - Synchronous Rectifiers Disabled in UVLO Mode
and Hiccup Mode - Two Independent, Programmable Dead-Time
Adjustments to Enable Zero-Volt Switching - Four High-Current 2-A Bridge Gate Drivers
- Wide-Bandwidth Opto-Coupler Interface
- Configurable for Either Current Mode or Voltage
Mode Control - Dual-Mode Overcurrent Protection
- Resistor Programmed 2-MHz Oscillator
- Programmable Line UVLO and OVP
The LM5046 PWM controller contains all of the features necessary to implement a phase-shifted full-bridge topology power converter 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- 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 dead-time to enable zero-volt switching of the primary FETs. Intelligent startup 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.
Technical documentation
Design & development
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LM5046EVAL — Evaluation Board for the LM5046
The LM5046 evaluation board is designed to provide the design engineer with a fully functional power converter based on the phase-shifted full-bridge topology to evaluate the LM5046 PWM controller. The evaluation board is provided in an industry standard quarter brick footprint.
LM5046 TINA-TI Transient Reference Design
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 28 | Ultra Librarian |
| WQFN (RSG) | 28 | Ultra Librarian |
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