- Evaluation Tools
900V, Fixed-Frequency, EMI-Optimized Flyback Regulator with Ultra-Low Standby
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The HF920B is a flyback regulator with a monolithic, 900V MOSFET. The HF920B is an enhanced version of the HF920 with EMI optimization. It provides excellent power regulation with very few external components for AC/DC applications that require high reliability, such as smart meters, large appliances, industrial controls, and products powered by AC grids.
The HF920B uses peak current control mode to provide excellent transient response and easy loop compensation. When the output power falls below a given level, the regulator enters burst mode. The IC is also optimized to achieve very low power consumption during standby conditions.
MPS’s proprietary, 900V, monolithic process enables over-temperature protection (OTP) on the same silicon as the 900V power MOSFET, offering the most precise thermal protection. The HF920B also offers a full suite of protection features, such as VCC under-voltage lockout (UVLO), overload protection (OLP), over-voltage protection (OVP), and short-circuit protection (SCP).
The HF920B is designed to minimize EMI for power line communications (PLC) in home and building automation applications. The operating frequency is programmed externally with a single resistor, so the power supply’s radiated energy can block interference to the PLC. In addition to the programmable frequency, the HF920B employs frequency jittering that greatly reduces the noise level and EMI filter costs.
Frequency doubling mode can be enabled through a simple external set-up. With this special operation mode, the switching frequency is doubled when the converter runs into an over-power condition. In this way, the converter is able to handle up to a 50% decrease of the transformer inductance caused by external magnetizing interference.
The HF920B is available in SOIC8-7A and SOIC14-11 packages, and the maximum output power is listed in Table 1 respectively.
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- Monolithic 900V/15Ω MOSFET and High-Voltage Current Source
- Programmable Switching Frequency, Up to 150kHz
- Current Mode Control Scheme
- Frequency Jittering
- Low Standby Power Consumption via Active Burst Mode
- <30mW No-Load Consumption
- Frequency Doubling Mode
- Internal Leading-Edge Blanking (LEB)
- Built-In Soft Start (SS)
- Internal Slope Compensation
- External Input PRO Pin Protection with Hysteresis and Auto-Restart Recovery
- Over-Temperature Protection (OTP)
- VCC Under-Voltage Lockout (UVLO) with Hysteresis
- Over-Voltage Protection (OVP) on VCC
- Time-Based Overload Protection (OLP)
- Short-Circuit Protection (SCP)
- Available in SOIC8-7A and SOIC14-11 Packages
EVHF920-S-00B Evaluation Kit 85VAC/60Hz~350VAC/50Hz 16.5V/300mA;16.5V/100mA Off-line Switching Regulator
HF920 is a flyback regulator with a monolithic 900V MOSFET. HF920 provides excellent power regulation in AC-DC applications that require high reliability. The switching frequency can be programmed with a single resistor. Also a special frequency doubling mode, designed for strong magnetizing application, can be enabled through a simple external setup.
EVHF920-S-00B evaluation board is specially designed for a better EMC performance with very few EMI filters, which provides reference to effective PCB design for the customer. It features an off-line wide input voltage (85VAC~350VAC) with dual outputs (16.5V/300mA, 16.5V/100mA), and a highly strong anti-interference ability to external magnetic field with the use of transformer core EF20, and is very suitable for the power meter application.
EVHF920-S-00B can meets EN55022 conducted EMI requirements easily with frequency jittering function. It offers a full suite of protective features such as over-temperature protection, VCC under-voltage lockout, over-voltage protection, over-load protection and short-circuit protection.