The LM5036device is a PWM controller, with integrated auxiliary bias supply, offering high power density forindustrial isolated power applications. It contains all the features necessary to implementhalf-bridge power converters, using voltage-mode control, with input voltage feed-forward. Thisdevice is intended to operate on the primary side of an isolated converter with DC input voltage upto 100-V. LM5036RJBT includes features that improve power density and reliability while reducing systemcost:
- An integrated fly-buck converter as auxiliary bias supply. Provides bias power for both primary and secondary circuits, with a minimum of external components.
- Fully regulated pre-bias start-up. Eliminates output voltage over-shoot or dips even when starting into a pre-charged output capacitor.
- Enhanced cycle-by-cycle peak current limit with pulse matching. LM5036RJBT limits both positive and negative current. Pulse matching ensures equal pulse width for low and high side devices, to avoid transformer saturation. Output current limit is approximately constant across the full range of input voltage.
Feature
- High integration controller for small form factor, high-density DC-DC power converters
- Integrated 100-V, 100-mA auxiliary bias supply
- Fully regulated pre-biased start-up
- Enhanced cycle-by-cycle current limiting with pulse matching for low and high primary FETs
- Optimized maximum duty cycle for primary-side FETs
- Voltage-mode control with input voltage feed-forward
- 100-V high-voltage start-up regulator
- Configurable latch, OVP operation
- Integrated 100-V, 2-A MOSFET drivers for primary-side FETs
- Programmable dead-time between primary-side and synchronous rectifier (SR) FETs
- Create a custom design using the LM5036 with the Excel Calculator Tool or WEBENCH Power Designer
