SSL3250A_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 30 June 2009

12 of 26

NXP Semiconductors

SSL3250A

Photo flash dual LED driver

8.4 Protection circuits

There are several protection circuits integrated in the device. These protection circuits

protect the device and the application against defects. The SSL3250A has four protection

circuits that will inhibit switching of the converter, programming the status register 03h and

pulling LOW the interrupt line. The interrupt line, which can be connected to external logic,

signaling an error condition. The external logic can read the status register to determine

which fault caused the interrupt and decide on the proper action to take. When not using

to signal a fault condition.

Fig 11. Indicator LED currents in Direct enable mode

0

7

5

3

1

014aaa368

0

12.5

7.5

2.5

17.5

Register

value

10.0

Indicator current using direct control mode

50

25

165

014aaa369

0

12.5

7.5

3.0

2.5

17.5

20.0

22.5

Register

value (k

Ω)