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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Setting the Switch Current Limit
The ISET pin is used to adjust the inductor current limit and to implement the soft-start feature.
With pin ISET connected to pin REF, the inductor current limit is set to 1.6A. With ISET connected to a resistor-divider
network from pin REF to GND, the current limit is calculated as:
I LIMIT = 1,6A ? ? ? ? ?
V ISET
----------------
1,25V
(EQ 2)
Soft Start
The soft-start feature can be implemented by placing a resistor between pin ISET and pin REF (see Figure 21) and a
capacitor between pin ISET and GND.
Figure 21. Circuit for Soft-Start with Maximum Switch Current Limit
2
REF
10nF
R SS
≥ 220k Ω
I LIMIT = 1.6A
C SS
1
ISET
AS1326A/
AS1326B
t SS = Rss x C SS
At power-up, ISET is 0V and the LX current is zero. As the capacitor voltage rises, the current increases and the output
voltage rises. The soft-start time constant is:
t SS = R SS x C SS
(EQ 3)
Where:
R SS ≥ 220k Ω .
Note: Placing a capacitor across the lower resistor of the current-limiting resistor-divider network enables both the
Figure 22. Application Circuit for Soft-Start with Reduced Switch Current Limit
2
REF
10nF
R SS2
R SS
≥ 220k Ω
C SS
1
ISET
AS1326A/
AS1326B
I LIMIT = 1.6A
(
Rss 2
Rss 1 + Rss 2
)
t SS = (Rss 1 || Rss 2 ) C SS
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