ON Semiconductor has introduced the NCP1237, NCP1238 and NCP1288 fixed-frequency, current-mode controller ICs. Targeted at AC-DC adapter applications, the new controllers are available in a choice of frequency options with single- or dual-level over-current thresholds. The standard device has a built-in 65 kHz oscillator, with 100 kHz and 133 kHz versions available on request.
The proprietary Soft-Skip mode utilised by these ICs ramps the peak current gradually during skip mode, reducing the risk of audible noise. Combining this with a frequency fold-back function, the controllers deliver high efficiency levels in light-load conditions and low input power during no-load conditions. The dynamic self-supply (DSS) function of the NCP1237 and NCP1238 provide an integrated startup current source that intelligently handles startup and line transient events. This simplifies the design of the auxiliary supply, reducing the size of the VCC capacitor.
To minimise external component count, the controllers integrate brown-out, over-power compensation and ramp compensation. They have an operational temperature range of -40°C to +125°C and are offered in a compact SOIC-7 package.
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