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CAT4004VP2-T3 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT4004VP2-T3 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 11 page CAT4004 Doc. No. MD-5024 Rev. B 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice BLOCK DIAGRAM 4 Current Sink Regulators Current Setting DAC Undervoltage Lockout Register Serial Interface RSET 100kΩ EN/DIM GND VIN VIN Reference Voltage Figure 2. CAT4004 Functional Block Diagram BASIC OPERATION The CAT4004 uses four tightly matched current sinks to accurately regulate LED current in each channel proportional to the current sourced from the RSET pin. SET LED R V 6 . 0 GAIN I × = There are six different gain settings for LED brightness that can be set through the EN/DIM pin. The default gain on power-up is 132. Tight current regulation for all channels is possible over a wide range of input and LED voltages due to independent current sensing circuitry on each channel. Each LED channel needs a minimum of 150mV headroom to sink constant regulated current. If the input supply falls below 1.8V, the under-voltage lockout circuit disables all LED channels and resets the circuit to default values. Any unused LED channels should be left open. |
Similar Part No. - CAT4004VP2-T3 |
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Similar Description - CAT4004VP2-T3 |
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