IR3522MTRPBF

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The IR3522MTRPBF is a voltage of current mode flyback controller targeted for switch mode power supplies. This device is primarily targeted at low power (<25 Watts) requirements. As part of Power Management Integrated Circuit (PMIC), the IR3522MTRPBF specializes in providing a high power density, low power consumption and cost effective solutions in a wide variety of applications. Here we take a look at the the application fields and the working principle of the IR3522MTRPBF.

Application Fields

The IR3522MTRPBF achieves enhanced performance through a high efficiency current mode control that provides accurate current limit control for greater precision, stability and faster transient response. This controller is well suited for isolated DC/DC applications in fast loop response and high power density. It features an adjustable-frequency current-mode control scheme, which optimizes efficiency and dynamic response of the converters. Its high voltage startup regulator is integrated for 4V to 90V wide applications. Its wide operating temperature range, 25°C to 125°C, makes the device suitable for industrial or medical applications.

The IR3522MTRPBF is a very versatile device that can be used to implement many different DC/DC applications. It can be used to develop isolated and non-isolated DC/DC topologies such as flyback, forward, push-pull, half-bridge, and multi-phase interleaved boost/flyback/forward converters. These converters can be used in applications such as portable and desktop computers, servers, telecommunications equipment, workstations, air conditioners, uninterruptible power supplies(UPS), motor drives, solar and electronic ballasts, and general purpose power supplies.

Working Principle

The IR3522MTRPBF features a half-bridge topology in its DC/DC controller which delivers higher power density than a classical half-bridge circuit. This controller regulates its output current to hold the internal pulse-width modulation (PWM) voltage value. The MOSFET gate drive supplies two independent symmetrical drives for two complementary MOSFETs connected in a half-bridge configuration. To reduce total conduction and switching losses, the output voltage is sensed with a top-side or bottom-side resistor.

The IR3522MTRPBF integrates two main functional blocks: the current mode control, which provides dynamic line and load compensation and fast dynamic loop response, and the start-up, which activates the current mode controls and begins the normal PWM operation. An internal soft start circuit is included to limit both the input and output current surges, as well as output voltage overshoot. The IR3522MTRPBF includes an under-voltage lockout (UVLO) circuit and an active burst mode, which further increases efficiency by reducing the converter standby current.

The IR3522MTRPBF also provides the comprehensive safety function, including Frequency Jump Start (FJS), Cycle-by-Cycle Over Current Protection (OVP), Hiccup Mode Over Voltage Protection (HiccupOVP) and SOA Protection, for improved reliability and system protection. The IR3522MTRPBF also features soft frequency fold-back (SFFB) to reduce the switching frequency if the input voltage or output power when it is increasing with overcurrent

Conclusion

In conclusion, the IR3522MTRPBF is a high power density, low power consumption and cost effective device for a wide variety of applications as part of Power Management Integrated Circuit (PMIC). It has an adjustable-frequency current-mode control scheme that optimizes efficiency and dynamic response of the converters. The IR3522MTRPBF also provides comprehensive safety function and a wide operating temperature range, 25°C to 125°C, making it suitable for many electronics needs.

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