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CAT3612 Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT3612 Datasheet(HTML) 10 Page - Catalyst Semiconductor |
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10 / 13 page  CAT3612 Doc. No. 5016 Rev. A 10 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice LED Current Setting Figure 1 shows the EN/DIM input timing diagram for setting the LED currents. The EN/DIM set-up time requires the signal to be held high for 10 µs or longer to ensure the initialization of the driver at power-up. Each subsequent pulse on the EN/DIM (300ns to 200 µs pulse duration) steps down the LED current from full scale of 150mA to zero with nearly 5mA resolution. The selection of the LED current per channel is shown in Table 1. Consecutive pulses should be separated by 300ns or longer. Pulsing beyond the 0mA level restores the current level back to full scale and the cycle repeats. Pulsing frequencies from 5kHz up to 1MHz can be supported during dimming operations. When the EN/DIM is held low for 1.5ms or more, the CAT3612 enters the shutdown mode and draws “zero” current. For applications with a single LED connected to one LED pin only, the unused LED pin must be tied to VOUT, as shown on Figure 3. Figure 3. Single LED on one LED pin Figure 4. Application with 2 LEDs Table 1. Selection of LED current per Channel Number of pulses on EN/DIM LED current (mA) 1 150 2 145 3 140 4 135.5 5 131 6 126 7 121 8 116 9 111 10 106.5 11 101.5 12 97 13 92 14 87 15 82 16 77.5 17 72.5 18 68 19 63 20 58 21 53 22 48.5 23 43.5 24 39 25 34 26 29 27 24 28 19 29 14.5 30 10 31 5 32 0 |
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Similar Description - CAT3612 |
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