IXDN0036 datasheet(14/41 Pages) IXYS

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Ballast Demonstrator Operation

ATAVRFBKIT / EVLD001 User Guide

4-13

7597A–AVR–02/06

4.4.2

Lamp Sequential

Step Description

After PB2 (boost voltage at 380V) = > 2.380V start preheat

Enable PD6 rectified lamp voltage sense

Enable PB0 and PB1 ½ bridge drive output

PB0 & PB1 12.5µS total period (80 KHz) 50% duty 180° out of phase.

Check PB4 > 20mV, then 2 lamps. If PB4 < 20mV assume a single lamp.

If PB4 < 10mV assume an empty fixture = fault & shutdown.

Determine the lamp intensity control method DALI (presence of data stream at PD4),

Swiss (presence of 50/60 Hz modulated 0 – 10V at PB6) or 0 - 10V (constant non-zero

voltage) at PB6.

4.4.3

Start and Ignition

Sequential Step

Description

Sweep PB0 and PB1 frequency down at 30KHz/sec or 33µS/sec rate.

Stop sweep at 40KHz or 25µS period (12.5µS pulses for each ½ bridge FET)

Check PB4 > 100mV (2 lamps) or > 30mV (1 lamp) for proof of ignition.

Hold ignition frequency for 10mS.

If no PD6 voltage, collapse to < 200mV for proof of ignition, increase frequency to

77KHz for preheat for 1 second.

Repeat ignition sequence 6 times then if fails, set DALI fail flag or shut down.

Disable if dimmed frequency > 60 KHz. Disable if single lamp.

Proceed to power setting command at 30KHz/sec rate as established by external con-

trol or if no internal control proceed to PB4 195mV at input terminals before gain (about

32KHz) for 100% power.

If Swiss control, proceed to max power. The Swiss continuous switch closure will cause

progressive increase in frequency at 33KHz per second. The exception for a single lamp

will be minimum frequency for 97mV (39 watts) at PB4 for 100% brightness. This is the

default power for a single lamp with no dimming.

IXDN0036 датащи(PDF) 14 Page - IXYS Corporation