LM5100BMA

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The LM5100BMA is a pulse width modulation (PWM) gate driver IC specifically designed to drive external power MOSFETs used in switched-mode power supply (SMPS) applications up to 500 Hz. It is ideal for asynchronous buck, boost, and SEPIC circuits as well as series resonant valley and peak-current-mode inverters. This IC operates over an industrial temperature range (-40 to +125°C) and has many features for its light-weight, small profile gatedriver design. This article will discuss the application field and working principle of the LM5100BMA.

The LM5100BMA’s main application field is DC/DC, AC/DC and AC/AC switching power supplies where one or two MOSFETs are employed. It can drive high and low side MOSFETs with independent gate drive sources, or it can use a single-ended gate drive voltage when employed as a half-bridge driver. The IC has both synchronous and asynchronous gate drive section suitable for peak-current-mode control, and the LM5100BMA’s robust driver reduces any ringing at the gate output by exceeding coil current limits without missing any transitions.

The LM5100BMA’s working principle is simple yet effective. It generates regulated gate drive signals for driving MOSFETs to regulate output voltage or current in power supplies. The primary feedback and adjustable switching frequency up to 500kHz allows precise control of the converter while minimizing system cost. The adjustable dead time eliminates shoot-through current and reduces switching losses through precise gate timings. The IC’s built-in gate drive error amplifier enables fast response to line or load transients, minimizing output voltage droop.

The LM5100BMA’s fast slew rate prevents voltage and current overshoot during switching and ensures stable converter operation. It has an inbuilt low gate-leakage current to reduce gate drive current to increase power efficiency. Also, the current-fold back feature allows using smaller-sized gate resistor, reducing PCB area and cost. The IC employs lower power clocking and a programmable frequency divider in order to reduce switching losses and optimize overall converter efficiency.

Electric vehicle charging application are well suited for the LM5100BMA. It has an interface for sensing current with a three phase input for maximum output charge current, making it a great option for charging electric vehicles. The desaturation detection feature prevents latch-up due to overcurrent events and improves safety performance. Protection features like over-current, under-voltage lockout and thermal shutdown ensure against degrading reliability and long-term performance.

The LM5100BMA can be used in AC/DC and AC/AC applications where the voltage rating of the MOSFET is higher than the line voltage. The IC’s high operating frequency and high peak current rating maximizes efficiency of the converter. The slew rate, noise and turn-off delay features all make it an excellent choice for high-frequency, high-output power supplies using numerous MOSFETs.

In conclusion, the LM5100BMA is a great PWM gate driver IC designed to drive external power MOSFETs used in various switching power supply applications. With its light-weight, small profile gatedriver design, fast slew rate, adjustable switching frequency, programmable frequency divider, current-foldback feature, desaturation detection, and various protection features, it is ideal for asynchronous buck, boost, and SEPIC circuits as well as series resonant valley and peak-current-mode inverters.

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