TPIC9201

微控制器电源和低侧驱动器

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

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Seven Outputs Rated at 150 mA and Controlled Through Serial Interface

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

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

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Internal Voltage Supervisory for Regulated Output

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Serial Communications for Control of Eight Low-Side Drivers

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Enable/Disable Input for OUT1

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

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

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Programmable Deglitch Timer Before RST Is Asserted Low 40 µs Typ

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Zero-Voltage Detection Signal

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Thermal Shutdown for Self Protection

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APPLICA ONS

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Electrical Appliances

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Air Conditioning Units

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Ranges

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Dishwashers

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Refrigerators

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Microwaves

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Washing Machines

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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.