MTSB1.5SLASH3-5.08 datasheet(19/30 Pages) IRF

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7.2 Dimensioning: EOL settings

µA

(Set in Basic Settings)

120

100

180

7.5

VSENSE

Buckvoltage

IRS2573D

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

100

150

200

250

300

350

400

450

Vbuck [V]

EOL Thresholds

VSENSE

13%

40%

The IRS2573D uses VSENSE pin to detect if fault condition has occurred. The voltage on

the OV pin sets the reference for the EOL thresholds.

VSENSE <= VOV(1/7.5)

→ Lamp under voltage fault (13% of OV)

VSENSE >= VOV(2/5)

→ Lamp over voltage fault (40% of OV)

VSENSE >= VOV

→ Buck over voltage threshold (100% of OV)

During the ignition phase the buck voltage is regulated to OV (e.g. 330V). If the buck

voltage stays below 13% of OV for more than 442sec or above 40% of OV for 1769sec,

the ballast will go to Fault mode and latched (CTCLK=270nF).

7.3 Dimensioning: Buck settings

 Lamp parameter

Start with the lamp parameter:

PLAMP=73W

VLAMP=100V

ILAMP=0.73A

 Buck current sensing resistor

Buck inductor over-current protection is setup by buck current sensing resistor:



PEAK







(7)

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