MT7725 is a high precision LED constant current control chip operating at critical conduction mode (CRM) with zero current switched-on and peak current switched-off. It’s mainly targeted for 85Vac~265Vac universal mains and non-isolated buck LED power systems.
MT7725 integrates proprietary high voltage supply circuit, which eliminates VCC capacitor and startup resistor. The IC also combines a high power MOSFET. Very simple application circuit is achieved.
Critical conduction mode ensures that the MT7725 turns on the internal power MOSFET when the inductor current reaches zero, reducing the power MOSFET switching loss, and achieving high efficiency. With critical conduction mode, MT7725 outputs high accuracy LED current, and further achieves excellent line regulation and load regulation. It’s insensitive to inductance and the I-shape inductor can be used.
MT7725 provides various protection features to enhance the system reliability, including over current protection (OCP), short circuit protection (SCP), and thermal adjustment, etc.