* 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 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
PowerPAD is a trademark of Texas Instruments.
## 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.
