PWM Control IC - BM1P068FJ

The PWM control IC for AC/DC "BM1P068FJ" provides an optimum system for all products that include an electrical outlet. A built-in start circuit that withstands 650 V helps to keep power consumption low. Both isolated and non-isolated versions are supported, making for simpler design of various types of low-power converters. Switching MOSFET and current detection resistors are external devices, thus achieving a higher degree of freedom in power supply design. The switching frequency is set as fixed. Since current mode control is used, a current limit is imposed in each cycle, and excellent performance is demonstrated in bandwidth and transient response. With a light load, frequency is reduced and higher efficiency is realized. A frequency hopping function is also built in, contributing to low EMI. Also on chip are soft start and burst functions, a per-cycle overcurrent limiter, VCC overvoltage protection, overload protection, and other protection functions.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BM1P068FJ-E2 Active SOP-J8 2500 2500 Taping Yes
Controller Type PWM
Vin1(Min.)[V] 8.9
Vin1(Max.)[V] 26.0
Start Circuit [V] 650.0
SW frequency(Max.)[KHz] 65.0
Vcc OVP Latch
Channel 1
Light Load mode No
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85
  • · PWM current mode method
    · Frequency Hopping function
    · Burst operation / Frequency reduction function when load is light
    · Built-in 650V start circuit
    · VCC pin under voltage protection
    · VCC pin over voltage protection
    · CS pin Open protection
    · CS pin Leading-Edge-Blanking function
    · Per-cycle over current protection circuit
    · Current protection with AC voltage compensation
    · Soft start
    · Secondary Over current protection circuit
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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.