IR21531DPBF

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IR21531DPBF are equipment from Polielectro\'s PMIC - Gate Drivers family, designed to manage power switching components, such as MOSFETs and IGBTs, with low conduction and switching losses. The main application field for this product is in high-performance, high-efficiency topologies for power conversion. With detailed Gate driver solution for these circuits, it is possible to create very efficient power converters with minimum losses.

The IR21531DPBF is a highly versatile Gate driver that is ideal for advanced power conversion topologies, such as interleaved switching circuits, like ZVS, ZCS, and ZCD. The device features two low-side and two high-side driver channels with independent UVLO, pre-driver, and disabling logic. The independent logic levels of the high-side channels also enable dual-output configurations, in which two distinct output voltages can be supplied simultaneously.

As part of its range of features, the IR21531DPBF has a low-side current limit circuit, which enables current-controlled operation of the low-side switches, allowing the user to optimize power converter design and minimize the conduction losses associated with the switch. It also has an adjustable Over-Current Limit (OCL) circuit, allowing for tighter control of the power switch currents. Its integrated DirectFET feature allows for a direct connection of N-Channel MOSFETs to the driver module, without the need for additional discrete FETs.

The IR21531DPBF is designed to operate from an input voltage range of 4.5 to 14V, while its two outputs can provide up to 18A peak (3A continuous). The device consumes a nominal 4.5A, and has an operating temperature range of -55°C to +125°C.

The working principle of the IR21531DPBF is fairly simple: it is a switching circuit based on N-Channel FETs, that allows for a direct connection of the power switch to the driver module. The inputs of the driver are two low-side and two high-side logic levels, which control the operation of the power switch. The power switch is driven by the difference between the two logic levels, which is referred to as the "switch-grab" voltage. This technique allows for a fast and efficient control of the power switch, with minimal conduction and switching losses.

The IR21531DPBF also features current limit protection, which is enabled by a current sense circuit connected in series with the power switch. This circuit is used to measure the actual current flowing through the power switch, and will automatically shut off the switch if the current exceeds the preset limit. This helps to protect the power switch from over-current or over-temperature conditions.

Overall, the IR21531DPBF provides a high-performance, high-efficiency power-switching solution for advanced topologies. With its versatile, adjustable Gate drive, and current-controlled low-side switch, it is ideal for applications where efficiency and power density are priorities. Furthermore, its extended temperature range and DirectFET feature offer additional advantages for power conversion designs.

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