M7232

MOSDESIGN SEMICONDUCTOR CORP. CONTINUOUS, ON/OFF LAMP DIMMER , / DIMMER M7232 GENERAL DESCRIPTION M7232 is a CMOS integrated circuits designed for the control of brightness of incandescent lamps. The outputs control the brightness of a lamp by controlling the firing angle of a TRAIC connected with the lamp. All internal timings are synchronized with the line frequency by means of a phase-lock loop circuit and output occurs once every half-cycle of the line frequency. The brightness of the output is con trolled by applying a low level at the TI input or a high level at the SL input. Function are implemented with very few interface components. If the sensor is touched momentarily (50ms to332ms), lamp is: (a) Turned off if it was on. (b) Turned on if it was off. The brightness resulting is either full brightness or depending on the circuit type, a previous brightness stored in the IC memory. If the sensor is touched more than 350ms the light intensity changes slowly. As long as the touch is maintained, the change continues; the direction of change reverses whenever the maximum or minimum brightness is reached. The IC also provides an input for slow dimming. By applying a slow clock to this input, the lamp can be dimmed slowly until total turn off occurs. FEATURES ‧ Phase-lock loop synchronization allows use in Wall Switch applications.. ‧ Provides brightness control of incandescent lamps with touch plates or mechanical switches. ‧ Control the duty cycle from 23% to 88% (co...