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CAT3614HV2-T2 Datasheet(PDF) 9 Page - ON Semiconductor

Part # CAT3614HV2-T2
Description  4-Channel 1-Wire LED Driver in 3 x 3mm Package
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT3614HV2-T2 Datasheet(HTML) 9 Page - ON Semiconductor

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CAT3614
© 2008 SCILLC. All rights reserved.
9
Doc. No. MD-5035, Rev. C
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2. CAT3614 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3614 starts operating in 1x mode
where the output will be approximately equal to the
input supply voltage (less any internal voltage losses).
If the output voltage is sufficient to regulate all LED
currents the device remains in 1x operating mode.
If the input voltage is insufficient or falls to a level
where the regulated currents cannot be maintained,
the device automatically switches (after a fixed delay
of 400µs) into 1.5x mode.
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (less any internal
voltage losses).
The above sequence is repeated each and every time
the chip is powered-up or is taken out of shutdown
mode (via EN/DIM pin).
Mode Control
1MHz
Oscillator
Current
Setting DAC
Serial
Interface
Registers
Reference
Voltage
1x mode (LDO)
1.5x Charge Pump
VIN
C1-
C2-
C1+
C2+
VOUT
CIN
1µF
1µF
1µF
EN/DIM
LED1
LED2
LED3
LED4
GND
LED Channel
Current Regulators


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