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233 Kansas Street, El Segundo, CA 90245 USA

Digitally Addressable DALI Dimming Ballast Reference Design

By

Cecilia Contenti and Tom Ribarich (International Rectifier)

and Ross Fosler (Microchip Technology, Inc.)

FEATURES

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Lamp Type: 1X 36W T8 Lamp (IRPLDIM2E)

1X 32W T8 Lamp (IRPLDIM2U)

Line Input: 185-265 VAC/50 Hz (IRPLDIM2E)

90-140VAC/60Hz (IRPLDIM2U)

Interface DALI (2 wires)

High Power Factor/ Low THD

High Frequency Operation

Programmable Lamp Filament Preheating

Programmable Ignition

High precision Digital Dimming

Logarithmic Dimming

Diagnostic and fault control

Lamp Fault Protection

Brownout Protection

IR21592 HVIC Ballast Controller

PIC16F628 Microcontroller

Optically Isolated Communications

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.

IRPLDIM2A Datasheet