| Topology | Full-Bridge, Half-Bridge, Push-Pull |
| Duty cycle (Max) (%) | 50 |
| Vin (Max) (V) | 14 |
| UVLO thresholds on/off (V) | Programmable/1.25V |
| Features | Current Limiting, HV Start-up, Integrated Gate Drivers, Multi-topology, SR Logic, Synchronization Pin |
| Operating temperature range (C) | -40 to 125 |
| Switching frequency (Max) (kHz) | 2000 |
| Rating | Catalog |
| Gate drive (Typ) (A) | 1.5, 2 |
- 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
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.
