MC7773N6 Datasheet, PDF (8/11 Pages) Cystech Electonics Corp. – Current Mode PWM Controller

CYStech Electronics Corp.
Spec. No. : C151N6
Issued Date : 2012.11.08
Revised Date :
Page No. : 8/11
Protect Functions
To increase the reliability of power supply system many protection functions is integrated in this controller,
including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP), Over Temperature
Protection(OTP), External Over Voltage Protection (OVP) and over voltage clamp, Under Voltage Lockout
on VDD (UVLO). At overload condition when FB input voltage exceeds power limit threshold value for
more than TD_PL (power limit debounce time), the controller reacts to shut down the output power
MOSFET. Device restarts when VDD voltage drops below UVLO limit. VDD is supplied by transformer
auxiliary winding output. It is clamped when VDD is higher than threshold value. The power MOSFET is
shut down when VDD drops below UVLO limit and device enters power on start-up sequence thereafter.
Pin floating protection for CS, FB, PT is also added. While one of this happens, the GATE is turned off.
PT Pin Typical Application Circuit
MC7773N6
CYStek Product Specification