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CAT3637 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT3637 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 14 page CAT3637 © Catalyst Semiconductor, Inc. 9 Doc. No. MD-5033 Rev. A Characteristics subject to change without notice SIMPLIFIED BLOCK DIAGRAM Figure 2. CAT3637 Functional Block Diagram BASIC OPERATION At power-up, the CAT3637 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 output voltage is insufficient or falls to a level where the regulated current cannot be maintained, the device automatically switches into 1.33x mode (after a fixed delay time of about 120μs). In 1.33x mode, the output voltage is approximately equal to 1.33 times the input supply voltage (less any internal voltage losses). If the output voltage is still insufficient or falls to a level where the regulated currents cannot be maintained, the device will automatically switch to the 1.5x mode (after a fixed delay time of about 400μs). In 1.5x mode, the output is approximately equal to 1.5 times the input supply voltage (less any internal voltage losses). If the output voltage is still insufficient to drive the LEDs, it will automatically switch into 2x mode where the output is approximately equal to 2 times the input supply voltage (less any internal voltage losses). If the device detects a sufficient output voltage to drive all LED currents in 1x mode, it will revert back to 1x mode. This only applies for changing back to the 1x mode. Mode Control 0.8, 1.1MHz Oscillator Current Setting DAC Serial Interface Registers Reference Voltage 1x mode (LDO) 1.33x, 1.5x, 2x Charge Pump VIN C1- C2- C1+ C2+ VOUT EN/SET LED1 LED2 LED3 LED4 LED5 LED6 100kΩ GND 6 Current Regulators |
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