FEATURES

· 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 VIN 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

Asserted Low (40 ms 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

DESCRIPTION/ORDERING INFORMATION

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.