- HF500A-30
HF500A-30
Fixed-Frequency, EMI-Optimized Flyback Regulator with Multi-Mode Control and Over-Power Line Compensation
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Description
The HF500A-30 is a fixed-frequency, current mode regulator with built-in slope compensation. The device integrates a 700V MOSFET and a full-featured controller into one chip for a low-power, offline, flyback, switch-mode power supply with EMI optimization.
While under medium or heavy loads, the regulator operates at a fixed frequency with frequency jittering. Frequency jittering reduces EMI energy on the switching frequency (fSW) and its harmonics. Under light-load conditions, the regulator holds the peak current and reduces fSW to 25kHz to offer excellent efficiency. At very light loads, the regulator enters burst mode to achieve low standby power consumption.
Full protection features include brown-in and brownout, VCC under-voltage lockout (UVLO) protection, overload protection (OLP), short-circuit protection (SCP), VCC over-voltage protection (OVP), input OVP, and over-temperature protection (OTP). The HF500A-30 features over-power line compensation to ensure that the overload protection point is independent of the input voltage (VIN). The HF500A-30 is available in a PDIP8-7B package.
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Features & Benefits
- 700V/1.4Ω Integrated MOSFET
- Fixed-Frequency, Current-Mode Control Operation with Integrated Slope Compensation
- EMI (Radiated Emissions) Optimization
- Frequency Foldback Down to 25kHz under Light Load Conditions
- Burst Mode for Low Standby Power Consumption
- Frequency Jittering for EMI Signature Reduction
- Over-Power Compensation
- Internal High-Voltage Current Source
- VCC Under-Voltage Lockout (UVLO) Protection with Hysteresis
- Configurable Input B/O and Over-Voltage Protection (OVP)
- VCC Over-Voltage Protection (OVP)
- Overload Protection (OLP) with Configurable Delay
- Latch-Off Protection On Timer
- Over-Temperature Protection (OTP) (Auto-Restart with Hysteresis)
- Short-Circuit Protection (SCP)
- Configurable Soft Start (SS)
- Available in a PDIP8-7B Package

Active Part Numbers:
HF500AGP-30
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
HF500A-30 Resources
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