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NXP Semiconductors
Average
inductor
SSL3250A
Photo flash dual LED driver
current
t < 50 μ s
T × Mask
Flash
014aaa296
Fig 9.
The inductor current during TxMask
8.3.7 Indicator LED
The indicator LED is connected between the V BAT and the dedicated indicator LED current
input pin. Internally a linear current sink controls the indicator LED current to reach the
required current level.
In I 2 C mode, the indicator LED current can be set between 2.5 mA and 17.5 mA. The
internal 3-bit register sets the actual indicator LED according to the formula in Equation 6 .
The external resistor R_IND is ignored.
I I _ IND = Register × 2.5 mA
(6)
When using the Direct enable mode, the indicator current can be determined by an
external resistor R_IND. The indicator current is defined using Equation 7 . It can be set
between 2.5 mA and 20 mA. When not using the resistor, the indicator current will be set
to a default level of 10 mA. This current is similar to connecting an external resistor of
50 k Ω . Entering Flash mode in Direct enable mode can be done using the EN1 and EN2
pins. The LED will stay on in Flash mode for as long as the enable pins are set.
I I _ IND = ------------------ × 10 mA
50 k Ω
R R _ IND
(7)
If there is no resistor connected to the R_IND pin, it can either be left unconnected or
connected to VIN. Never connect the R_IND pin to GND since it will cause unnecessary
reference currents to flow to GND.
Figure 10 illustrates the Indicator mode current setting equation for I 2 C, while Figure 11
illustrates the Indicator mode current setting equation for the Direct enable mode.
SSL3250A_5
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
11 of 26
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