SSL3250A_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 30 June 2009

8 of 26

NXP Semiconductors

SSL3250A

Photo flash dual LED driver

default current is equal to connecting an external current set resistor of 50 k

Ω. Entering

Torch mode in Direct enable mode can be done using the EN1 and EN2 pins. The LED

will stay on in Torch mode for as long as the enable pins are set to Torch mode.

(2)

When not using an external resistor, the R_TR pin can be left unconnected, but it is

preferably connected to VIN. Never connect the R_TR pin to GND since it will cause

unnecessary reference currents to flow to GND.

illustrates the Torch mode current setting equation for the Direct enable mode.

Fig 5.

Fig 6.

Torch mode LED current in Direct enable mode

I

LED

50 k

Ω

R

R_TR

---------------

125 mA

×

=

Register

value

01

9

11

7

5

3

014aaa364

0

150

100

50

200

Torch current using direct control mode

Register

value (k

Ω)

125

31.3

50

014aaa365

0

150

125

100

50

200

250