Digital Dimming DALI Ballast for 32W/T8 110V input

By

Cecilia Contenti and Tom Ribarich (International Rectifier)

and Ross Fosler (Microchip Technology, Inc.)

FEATURES

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Lamp Type: 1X 32W T8 Lamp

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Line Input: 90-140VAC/60Hz

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Interface DALI (2 wires)

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High Power Factor/ Low THD

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High Frequency Operation

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Programmable Lamp Filament Preheating

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Programmable Ignition

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High precision Digital Dimming

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Logarithmic Dimming

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Diagnostic and fault control

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Lamp Fault Protection

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Brownout Protection

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IR21592 HVIC Ballast Controller

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PIC16F628 Microcontroller

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Optically Isolated Communications

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Low power standby mode

INTRODUCTION

This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive

rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal

voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628

microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI). Other

features include EMI filtering, transient protection and lamp fault protection.

International Rectifier

• 233 Kansas Street, El Segundo, CA 90245 USA

IRPLDIM2U rev.a