Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC for AC/DC Converter - BM1051F

BM1051F is compounded LSI of Power Factor Correction converter (PFC) for harmonic solution and DC/DC converter (DC/DC). Because DC/DC operates on Quasi-resonant method, DC/DC contributes to Low EMI. BM1051F built in a HV starter circuit that tolerates 650V. Because of putting the current sense resistors externally both the PFC part and the DC/DC part, IC enables power supply design free. In the PFC part, IC adopts peak current control operation. Suitable application is proposed by a various protection circuit, such as the multiplier with a revision circuit on the AC voltage falls, the load regulation revision circuit, and the maximum power feed-forward circuit, etc. The Quasi-resonant system of a DC/DC part contributes to low EMI because PFC operates by soft switching. A burst mode is built in, so the power is reduced at light load. Various protection functions, such as a soft start function, a burst function, an over-current limiting for every cycle, overvoltage protection, and over current protection, are built in. The pin for communicated control with a controller and the external stop pin are prepared; it proposes the system thatcan be adapted for various applications.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BM1051F-GE2 Active SOP24 2000 2000 Taping Yes
Controller Type PFC + QR
Vin1(Min.)[V] 8.0
Vin1(Max.)[V] 24.0
Start Circuit [V] 650.0
SW frequency(Max.)[KHz] 120.0
Vcc OVP Auto Restart / Latch
Channel 1
Light Load mode Yes
Soft Start Yes
Under Voltage Lock Out Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85
    • Quasi-resonant circuit + PFC circuit
    • Built-in HV Starter circuit
    • Low consumption current (typ.10µA) when starter circuit is OFF.
    • Quasi resonant circuit
      • Max operating frequency (120kHz)
      • Frequency reduction function
      • Over-current limiting variable function
      • Pulse-by-pulse over-current protection circuit
      • Built-in Soft start
      • Voltage protection function (brown out) during low input
      • ZT pin Over Voltage Protection
      • Output overload protection (auto recovery /latch switching enabled)
      • 250nsec Leading-Edge Blanking
    • Power Factor Correction circuit
      • Peak current control (65kHz)
      • Per-cycle over current protection circuit
      • Maximum power revision
      • the multiplier with a revision circuit when the AC voltage falls the load change measure circuit
    • Selectable protection method by LATCH/AUTOR terminal.
      • LATCH/AUTOR=H : Latch
      • LATCH/AUTOR=L : Auto recovery
    • External stop function (COMP pin)
    • AC input voltage stop detected function (ACDET)
    • Built-in PFC stop terminal (PFCON/OFF)
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BM1050AF Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC for AC/DC Converter SOP24   Buy Sample
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Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.