AATIAN107 Datasheet, PDF (5/8 Pages) SiGe Semiconductor, Inc. – S2Cwire Controlled, Serial LED Boost Driver

AHK1421 EVAL :
EVALUATION BOARD DATASHEET
EV-184
S²Cwire Controlled, Serial LED Boost Driver
Functional Testing and Evaluation
Operational Waveform
Figure 5 shows the waveform controlled by S²Cwire at 3.6V V_IN when the code changes from 32 to 1.The I_LED changes
from 0.4mA (2% I_MAX) to 20mA (I_MAX).
Channel
1
2
3
4
Signal
V_OUT
EN/SET
I_LED
I_IN
Figure 5: Operational Waveform under S²Cwire Control.
Start up
Figure 6 shows the AHK1421 startup waveform after adding rising edge on EN/SET. Soft start control makes the input
current rise slowly.
Channel
1
2
3
4
Signal
SW
V_OUT
I_LED
I_IN
Figure 6: Start Up Waveform.
EV-184.2011.05.1.0
www.analogictech.com
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