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CAT3636 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT3636 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 16 page CAT3636 Doc. No. MD-5020 Rev. D 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice BLOCK DIAGRAM Mode Control 0.8, 1.1MHz Oscillator Current Setting DAC Serial Interface Registers Referece Voltage 1x mode (LDO) 1.33x, 1.5x, 2x Charge Pump VIN C1- C2- C1+ C2+ VOUT EN/SET 100kΩ GND LEDA1 LEDA2 LEDB1 LEDB2 6 Current Sink Regulators LEDC1 LEDC2 Figure 2. CAT3636 Functional Block Diagram BASIC OPERATION At power-up, the CAT3636 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 wher e the regulated currents cannot be maintained, the device automatically switches into 1.33x mode (after a fixed delay time of about 400μs). 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 input voltage is insufficient again or falls to a level where the regulated currents cannot be maintained, the device will automatically switch to the 1.5x boost 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 input voltage fails more or is still insufficient to drive the LEDs, it will automatically switch again 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 input voltage is present to drive all LED currents in 1x mode, it will change automatically back to 1x mode. This only applies for changing back to the 1x mode |
Similar Part No. - CAT3636 |
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Similar Description - CAT3636 |
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