Quasi-Resonant Control type DC/DC Converter IC - BM1Q002FJ

The quasi-resonant controller typed AC/DC converter IC (BM1Q00XFJ series) provides an optimum system for all products that include an electrical outlet. Quasi-resonant operation enables soft switching and helps to keep EMI low. With MOSFET for switching and current detection resistors as external devices, a higher degree of design freedom is achieved. As BM1Q00XFJ series built in HV starter circuit, it contributes to low consumption power and high speed start. Because the built-in burst mode is reduced switching loss and IC consumption current is low, Stand-by power is very low. Because BM1Q00XFJ series built-in soft-start, burst mode, over current limiter which is cycle-by-cycle, over load protection, over voltage protection, CS open protection and so on, BM1Q00XFJ series are highly safety.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BM1Q002FJ-E2 Active SOP-J8 2500 2500 Taping Yes
Controller Type QR
Vin1(Min.)[V] 8.9
Vin1(Max.)[V] 26.0
Start Circuit [V] 650.0
SW frequency(Max.)[KHz] 120.0
Vcc OVP Latch
Channel 1
Light Load mode Yes
Soft Start Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85
  • ・Quasi-resonant method
    ・Built-in 650V tolerate start circuit
    ・Low power when load is light ( Burst operation)
    ・Maximum frequency control (120kHz)
    ・Frequency reduction function
    ・AC voltage correction function
    ・VCC pin : under voltage protection
    ・VCC pin : overvoltage protection
    ・Over-current protection (cycle-by-cycle)
    ・OUT pin : H voltage 12V clamp
    ・Soft start
    ・ZT trigger mask function
    ・ZT Over voltage protection
    ・FB Over Load protection [Auto-restart]
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Technical Data
Quasi-Resonant Converter Technical Design

This application note describes the design of Quasi-Resonant converters using ROHM’s AC/DC converter IC BM1Q0xx series devices.

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.