Pref DRVR Octal 7V to 18V 3787mW 20-Pin HTSSOP EP Tube

The power supply provides regulated 5-V output to power the system microcontroller and drive eight low-side switches. The ac zero-detect circuitry is monitoring the crossover voltage of the mains ac supply. The resultant signal is a low-frequency clock output on the ZVS terminal, based on the ac-line cycle. This information allows the microcontroller to reduce in-rush current by powering loads on the ac-line peak voltage. A serial communications interface controls the eight low-side outputs; each output has an internal snubber circuit to absorb the energy in the inductor at turn OFF. Alternatively, the system can use a fly-back diode to VIN to help recirculate the energy in an inductive load at turn OFF.

Eight Low-Side Drivers With Internal Clamp for Inductive Loads and Current Limiting for Self Protection

• Seven Outputs Rated at 150 mA and Controlled Through Serial Interface
• One Output Rated at 150 mA and Controlled Through Serial Interface and Dedicated Enable Pin

5-V ±5% Regulated Power Supply With 200-mA Load Capability at V_IN Max of 18 V

Internal Voltage Supervisory for Regulated Output

Serial Communications for Control of Eight Low-Side Drivers

Enable/Disable Input for OUT1

5-V or 3.3-V I/O Tolerant for Interface to Microcontroller

Programmable Power-On Reset Delay Before RST Asserted High, Once 5 V Is Within Specified Range (6 ms Typ)

Programmable Deglitch Timer Before RST Is Asserted Low (40 µs Typ)

Zero-Voltage Detection Signal

Thermal Shutdown for Self Protection

APPLICATIONS

• Electrical Appliances
  • Air Conditioning Units
  • Ranges
  • Dishwashers
  • Refrigerators
  • Microwaves
  • Washing Machines
• General-Purpose Interface Circuits, Allowing Microcontroller Interface to Relays, Electric Motors, LEDs, and Buzzers