ZHCSI27C April 2018 – October 2021 LM5036
PRODUCTION DATA
The LM5036 device is a highly-integrated, half-bridge PWM controller with integrated auxiliary bias supply. It provides a high power-density solution for telecom, datacom and industrial power converters. The device has all of the features necessary to implement a power converter that uses half-bridge topology. The device employs voltage-mode control and includes input voltage feed-forward to improve performance. This device operates on the primary side of an isolated DC-DC power converter with input voltage up to 100-V.
The soft-start function provides a fully regulated and monotonic rise of output voltage, even when the converter energizes into a pre-biased load. The device uses an enhanced cycle-by-cycle (CBC) current limit. This function matches the pulse to maintain the voltage balance of the half-bridge capacitor divider. This method ensures flux balance of the transformer during CBC operation. The input voltage compensation function helps to minimize the variation of the current limit level across the entire input voltage range.
The LM5036 device has these other features:
An Excel Calculator Tool is provided to ease the process of creating custom designs using this controller. This tool calculates values for all the external components required by the controller to meet a given specification. It also generates many key parameters of the power stage including, for example, the turns ratio of the half-bridge transformer. The tool generates graphs predicting, for a given set of current limit components, how the output current limit will vary with input voltage. Maximum flexibility is offered by calculating suggested values for most components, but allowing the user to input values of their own choice.