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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.
I LED = --------------- × 125 mA
50 k Ω
R R _ TR
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.
Figure 5 illustrates the Torch mode current setting equation for I 2 C, while Figure 6
illustrates the Torch mode current setting equation for the Direct enable mode.
200
I LED (mA)
150
100
50
0
(2)
0
1
3
5 7
Torch current using I 2 C mode
9
11
Register
value
014aaa364
Fig 5.
Torch mode LED current in I 2 C mode
250
200
I LED (mA)
150
125
100
50
0
125
50
Torch current using direct control mode
31.3
Register
value (k Ω )
014aaa365
SSL3250A_5
Fig 6.
Torch mode LED current in Direct enable mode
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
8 of 26
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