DESCRIPTION
The MT7838 is a single-stage buck average constant current controller. With MAXIC proprietary control technique, the system with MT7838 can achieve both high current accuracy and power factor correction. MT7838 works in critical conduction mode (CRM) to reduce switching losses. The MT7838 can be powered up directly by the main-line voltage without the need of start-up resistors, achieving an ultra fast start-up time of less than 100ms. The MT7838 provides various protections, such as over current protection (OCP), over voltage protection (OVP), short circuit protection (SCP) and over temperature protection (OTP), etc, to maintain system reliability.

FEATURES
Single-stage active power factor correction (PFC > 0.90)
Ultra-fast start-up time (<100mS)
High accurate LED current
Critical conduction mode (CRM) operation
Up to 60 watt driving capability.
Various protection schemes.
Adjustable constant current and output power setting
Power-on soft-start
Compact package: SOP8