描述 Description

The HFC0502 is a fixed-frequency, flyback, current-mode controller with current control mode and internal slope compensation. It is designed for medium-power, offline, flyback, switch-mode power supply applications.

The HFC0502 is a highly efficient, green-mode controller. At light loads, the controller freezes the peak current (IPEAK) and reduces the switching frequency (fSW) to 25kHz for excellent light-load efficiency. At very light loads, the controller enters burst mode to achieve low standby power consumption.

Frequency jittering (fJITTER) helps dissipate energy generated by conducted noise, which reduces electromagnetic interference (EMI). The HFC0502 employs over-power compensation (OPC) to reduce the difference between the over-power (OP) protection point at the low line and the OP protection point at the high line.

Full protection features include thermal shutdown, VCC under-voltage lockout (UVLO) protection, overload protection (OLP), over-voltage protection (OVP), and brownout protection.

The HFC0502 is available in an SOIC8-7A package.

特性 Features

? Fixed-Frequency, Current Mode Control, and Internal Slope Compensation
? Frequency Foldback Down to 25kHz at Light Loads
? Burst Mode for Low Standby Power Consumption, Meets EuP Lot 6 Standards
? Frequency Jittering (fJITTER) for Reduced Electromagnetic Interference (EMI)
? Compatible with DC and AC Inputs
? Adjustable Over-Power Compensation (OPC)
? Internal High-Voltage Current Source
? VCC Under-Voltage Lockout (UVLO) Protection with Hysteresis
? Brownout Protection via the HV Pin
? Configurable Soft Start (SS)
? Overload Protection (OLP) with Configurable Delay
? Short-Circuit Protection (SCP)
? Latch-Off Protections:
? VCC Over-Voltage Protection (OVP)
? External OVP or Over-Temperature Protection (OTP) via the TIMER Pin

? Thermal Shutdown with Auto-Restart and Hysteresis
? Available in an SOIC8-7A Package