HF920 900V, Fixed-Frequency, Offline Regulator w/ Ultra-Low Standby Power Consumption The Future of Analog IC Technology DESCRIPTION FEATURES The HF920 is a flyback regulator with a Monolithic 900V/15 MOSFET and High- monolithic, 900V MOSFET. The HF920 provides Voltage Current Source excellent power regulation in AC/DC Fixed Switching Frequency, Programmable applications that require high reliability, such as up to 150kHz smart meters, large appliances, industrial Current-Mode Control Scheme controls, and products powered by poor AC grids. Frequency Jittering The HF920 requires a minimal number of Low Standby Power Consumption via Active external components. Burst Mode <30mW No-Load Consumption The HF920 uses peak-current-mode control to Frequency Doubling Operation Mode provide excellent transient response and easy loop compensation. When the output power falls Internal Leading-Edge Blanking (LEB) below a given level, the regulator enters burst Built-In Soft-Start (SS) Function mode. The IC consumption is also specially Internal Slope Compensation optimized. As a result, the HF920 achieves very External Input PRO Pin Protection with low power consumption during standby Hysteresis and Auto-Restart Recovery conditions. Over-Temperature Protection (OTP) VCC Under-Voltage Lockout (UVLO) with MPSs proprietary, 900V, monolithic process Hysteresis enables an over-temperature protection (OTP) Over-Voltage Protection (OVP) on VCC that is on the same silicon as the 900V power Time-Based Overload Protection (OLP) MOSFET, offering the most precise thermal protection. The HF920 also offers a full suite of Short-Circuit Protection (SCP) protection features such as VCC under-voltage Available in SOIC8-7A and SOIC14-11 lockout (UVLO), overload protection (OLP), Packages over-voltage protection (OVP), and short-circuit APPLICATIONS protection (SCP). E-Meters The HF920 is designed to minimize Industrial Controls electromagnetic interference for power line Large Appliances communications (PLC) in home and building All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For automation applications. The operating MPS green status, please visit the MPS website under Quality Assurance. MPS frequency is programmed externally with a single and The Future of Analog IC Technology are registered trademarks of Monolithic Power Systems, Inc. resistor, so the power supplys radiated energy can be designed to block interference to the PLC. Table 1: Maximum Output Power In addition to the programmable frequency, the P (W) MAX HF920 employs frequency jittering that reduces Package 85Vac~420Vac 230Vac15% the noise level and EMI filter cost greatly. SOIC8-7A 6.5 9.5 Frequency-doubling mode operation can be SOIC14-11 7 10 enabled through a simple external set-up. With NOTES: The maximum output power is limited by junction temperature. this special operation mode, the switching Test is done under T = 50C. The test board is placed into a A frequency is doubled when the converter runs box about 20cm*15cm*10cm. into an over-power condition. In this way, the To reduce V , the turns ratio is set to 5. DS Single output, VOUT = 12.5V. converter is able to handle up to a 50% decrease 2 GND of the SOIC8-7A package is connected to a 3cm copper of the transformer inductance caused by external area with exposed copper strips. GND of the SOIC14-11 2 magnetizing interference. package is connected to a 2.5cm copper area. Working condition under minimum input voltage is set to BCM. HF920 Rev. 1.02 www.MonolithicPower.com 1 12/3/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2018 MPS. All Rights Reserved.HF920 HF920 900V, FIXED-FREQUENCY, OFFLINE SWITCHING REGULATOR TYPICAL APPLICATION 85- + + 420Vac + D VCC PRO FB S FSET GND HF920 HF920 Rev. 1.02 www.MonolithicPower.com 2 12/3/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2018 MPS. All Rights Reserved.HF920