LT1186FIS#TRPBF

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The LT1186FIS#TRPBF is a constant-current, quasi-resonant buck switching regulator, specifically designed for the lighting, ballast controllers application field. The device includes a high-side MOSFET and a low-side MOSFET connected in a synchronous Buck topology with a primary side transformer. It commands the power MOSFETs to switch on and off automatically, adjusting the time delay between them.

The LT1186FIS#TRPBF provides excellent light regulation and enables high efficiency, wide input voltage range and excellent line and load regulation. A wide range of operating parameters like voltage, current and frequency can be adjusted accurately by external pins. The LT1186FIS#TRPBF can be used in buck-mode or push-pull mode applications. Its high frequency operation and use of synchronous rectification technology provide significant advantages such as low power dissipation, EMI reduction and improved efficiency.

The working principle of the LT1186FIS#TRPBF starts with a power supply providing the power to the primary winding of the transformer. As the power is applied the controller tries to maintain a constant frequency, depending on the output voltage. The output of the transformer is then rectified and filtered and then give the output voltage. When the output voltage rises, the controller adjusts its switching frequency to maintain the voltage at the desired level. The output voltage remains constant even when some load is applied (or removed) from the circuit. As the current draw varies, so does the switch frequency and the output voltage of the regulator.

In addition, the LT1186FIS#TRPBF also supports a wide range of protections like overvoltage protection, short-circuit protection, undervoltage protection, etc. It also provides a fault output flags so that the controller can be monitored by an external microcontroller. This makes the LT1186FIS#TRPBF particularly suitable for lighting, ballast controllers applications, as it is able to provide an ultra-low output ripple, a high power efficiency and an active power factor correction.

In summary, the LT1186FIS#TRPBF makes an ideal choice for lighting, ballast controllers applications thanks to its high efficiency and wide input voltage range. Its quasi-resonant buck architecture, synchronous rectification, frequency and current adjustable feature, fault output flags and other protections make it particularly well suited for such applications.

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