ON Semiconductor has expanded its portfolio of AC-DC power solutions for home electronics with the introduction of the NCP1234 and NCP1236 family of fixed frequency pulse width modulation (PWM) current mode controllers. These solutions are targeted at AC-DC adapter applications for laptop/notebook computers, LCD displays, printers and household consumer electronics.
The NCP1234 and NCP1236 family allows offline power supplies to be designed into systems, while minimising the footprint and board space area required. Utilising a high-voltage process technology, they integrate multiple features such as over-power compensation, brownout (NCP1236 only) and ramp compensation without increasing power dissipation or adding external components. High-voltage dynamic self-supply (DSS) technology enables direct connection to the line voltage, eliminating the need for startup resistors. This technology, combined with the family’s ability to automatically decrease frequency at light loads before entering skip mode, ensures high efficiency across the entire load range.
The devices are available in two frequency options – 65 kHz or 100 kHz – with the option to automatically recover, or latch off the device during a fault condition.
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