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  4. Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B (Monolithic Power Systems, Inc.)
Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B-HF920B
Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B-Monolithic Power Systems, Inc.

Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B
Monolithic Power Systems, Inc.

About This Product

■Summary

The HF920B is a monolithic, 900V MOSFET-equipped flyback regulator. HF920B is an enhanced version of 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 with 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 predetermined level, the regulator enters burst mode. The IC is also optimized for very low power consumption during standby. MPS' proprietary 900V monolithic process enables overtemperature protection (OTP) on the same silicon as the 900V power MOSFET, providing the most accurate thermal protection. HF920B also offers complete protection features such as VCC overvoltage lockout (UVLO), overload protection (OLP), overvoltage 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 externally programmed with a single resistor, so the power supply's radiated energy can be blocked from interfering with the PLC. In addition to programmable frequency, the HF920B employs frequency jittering, which significantly reduces noise levels and EMI filter costs. Frequency doubling mode can be enabled using a simple external setup. This special mode of operation doubles the switching frequency when the converter goes into an overpower condition. In this way, the converter can cope with up to 50% reduction in transformer inductance caused by external magnetization interference. The HF920B is available in SOIC8-7A and SOIC11 packages, each with maximum output power listed in Table 1.

■Features and benefits

・Monolithic 900V/15Ω MOSFET and high voltage current source ・Programmable switching frequency, up to 150kHz ・Current mode control scheme ・Frequency jittering

  • Product

    Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B

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1 Models of Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B

Image Part Number Price (excluding tax) Control Method Type Typical Pmax (W) VCC (max) (V) Vac (max) (V) Vac (min) (V) Vbr (V) Fsw (max) (kHz) Package (mm)
Flyback Secondary Regulation 900V, Fixed Frequency, EMI Optimized Flyback Regulator with Ultra-Low Standby HF920B-Part Number-HF920B

HF920B

Available upon quote

Fixed Frequency

Regulator

10

30

420

85

900

150

SOIC14-11, SOIC8-7A

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About Company Handling This Product

Monolithic Power Systems, Inc.

Company Overview

Monolithic Power Systems (MPS), founded in 1997 and headquartered in San Jose, California, is a manufacturer o...

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