The MLX90805 is a member of the MLX902xx intelligent transistor driver ICs. This IC is specially designed for small power AC motor controllers and energy-saving lamp controllers. The chip adopts advanced digital circuit technology, integrates soft-start circuit, optional temperature compensation function and optional soft-start time function, with low power consumption, high reliability, good anti-interference performance and other characteristics.
The handbook describes the MLX90805 Intelligent Triac Controller, a power‑control IC designed for soft‑start and speed control of resistive or inductive loads such as AC motors and dimmers. It explains the internal architecture, including the voltage regulator, oscillator, frequency‑locked loop, ADC, ROM table, zero‑cross detector, logic, and triac driver.
Application circuits for soft‑start only, as well as 2‑wire and 3‑wire potentiometer configurations, are provided with performance graphs. Pinout, electrical specifications, package dimensions, and option settings are listed for designers integrating the device into their products.
| Ambient temperature range | 0 °C to 85 °C |
|---|---|
| Maximum chip temperature | 150 °C |
| Supply voltage (VDDA) | 14 V – 18 V |
| Internal digital supply (VDD) | 5 V (4.6 V – 5.4 V typ.) |
| Maximum source supply current (IDDA) | 10 mA |
| Triac gate current (ITRG) | 30 mA – 90 mA |
| ADC resolution | 4 bits |
| Number of ROM firing angles | 16 |
The ROM can store up to 16 different firing angles, each defined by a 10‑bit value.
The internal digital circuitry is powered by a 5 V supply derived from the external VDDA.
The triac driver provides a gate current selectable between 30 mA and 90 mA (ITRG).