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CAT3614HV2-T2 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT3614HV2-T2 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 13 page 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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