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NXP Semiconductors
SSL3250A
Photo flash dual LED driver
Table 6. Description of registers …continued
Legend: * default register value
Address
01h
Register
Timer control
Bit
7 to 5
4
Symbol
Reserved
TO_DEF
Access
-
R/W
Value
-
0 *
Description
-
select time-out limit (default)
1
select timed operation
3 to 0
TO
R/W
0000 *
820 ms (default)
0001
.....
1110
1111
765 ms
.....
56 ms
1 ms
02h
Flash strobe
7 to 1
Reserved
-
-
-
0
FLASH_STRB R/W
0 *
1
-
enable flash
03h
Status
7 to 4
3
Reserved
OStrig
-
R
-
0 *
-
LED not shorted to GND
1
LED shorted to GND
2
OTPtrig
R
0*
temperature < maximum temperature
1
temperature > maximum temperature;
protection triggered
1
TOtrig
R
0 *
flash time < time-out
1
flash time > time-out, protection triggered
0
OVPtrig
R
0 *
V O < V ovp
1
V O > V ovp , protection triggered
9. Application design-in information
9.1 Input capacitor
For good input voltage decoupling a low ESR ceramic capacitor is highly recommended. A
4.7 μ F (X5R/X7R) 6.3 V is the minimum recommended value. Since the input capacitor is
supplying the input ripple current, a larger capacitor will improve transient behavior of the
regulator and EMI behavior of the power supply. Taking the capacitor DC bias and the
temperature derating specifications into account, a 10 μ F (X5R/X7R) is preferred.
Although it is increasing the component count, a smaller capacitor of 100 nF (X5R/X7R)
placed in parallel to the input capacitor will also improve EMI behavior.
When the circuit is used in other than battery powered applications and the input capacitor
is located relatively far from the DC buffer capacitors, it is recommended to add a 150 μ F
tantalum or a 470 μ F electrolytic capacitor in parallel near the input capacitor.
9.2 Output capacitor
The output capacitor supplies the current to the main LED, while the inductor is being
charged, and it also ensures loop stability. The minimum capacitance for stable loop
operation would be 2.2 μ F, but taking the capacitor DC bias and the temperature derating
specifications into account, a low ESR ceramic capacitor of 4.7 μ F (X5R/X7R) is highly
recommended. A higher value of capacitance will improve output current ripple, while
SSL3250A_5
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
17 of 26
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