TC4467CPD

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The TC4467CPD is a dual channel load driver IC designed to drive PFC and LLC converters in server power supplies. It is part of the Power Management Integrated Circuit (PMIC) family, specifically the Gate Drivers portfolio. The TC4467CPD enhances system performance with its dual channel outputs, allowing it to drive two separate devices with a single circuit board.

The TC4467CPD is a low-cost dual channel driver for PFC/LLC half bridge converters. The device is capable of providing up to 12.5A continuous current to each channel and 18A peak current on each channel. The integrated output drivers also provide wide load range of 3A to 15A. The TC4467CPD can provide various channel enable functions through the use of high frequency pulse width modulation (PWM) input signals, allowing it to drive both synchronous rectification (SR) and DC/DC converters.

The TC4467CPD features Adaptive Shoot Through Protection (ASTP), which helps detect and reduce shoot through current during voltage transition times for improved power supply efficiency. It is also well suited for synchronous rectification control in PFC/LLC applications since it provides a low on-state resistance (<0.4 ohms) for higher efficiency. The integrated over current protection (OCP) helps ensure over current protection up to a current level of 20A. Other features of the device include a programmable dead time of up to 80ns, under voltage lock out (UVLO), over voltage protection (OVP), an adjustable current limit and thermal protection.

The TC4467CPD reduces system cost and complexity by providing the ability to integrate two channels within a single device, it also reduces the number of components required in the design and the associated design complexity. The device utilises analog inputs to configure autonomous and pulse width modulation (PWM) control, enabling both autonomous and time domain control methods as well as manual, switching and current mode control.

The working principle of the TC4467CPD is based on switching current to the output stages through an internal pair of MOSFETs, each of which drives an output (channel). The IC is capable of switching the outputs to either low-side or high-side configuration depending on the signal from the controller. The internal circuit provides an adjustable dead time between the two channels to prevent shoot through and an adjustable current limit loop. The operational current limit can be adjusted from 0.54A to 16A by means of an external resistor. The power good signal and thermal shutdown are internally available for protection.

In summary, the TC4467CPD is an efficient and long-life dual channel load driver IC designed for use in server power supplies. Its integrated Adaptive Shoot Through Protection (ASTP) can reduce shoot through current during voltage transition times significantly. It is also capable of providing a wide range of load driver output current, adjustable dead time and adjustable current limit loop. The TC4467CPD is an excellent choice for zero current switching and a reliable and cost effective solution for PFC/LLC applications.

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