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CAT3643HL1-T2 Datasheet(PDF) 11 Page - ON Semiconductor |
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CAT3643HL1-T2 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 17 page CAT3643 © 2008 SCILLC. All rights reserved. 11 Doc. No. MD-5022 Rev. G Characteristics subject to change without notice SET R V 6 . 0 132 × LED Current Selection At power-up, the initial LED current is set to full scale (100% brightness) by the external resistor RSET as follows: LED current = The EN/DIM pin has two primary functions. One function enables and disables the device. The other function is LED current dimming with six different levels by pulsing the input signal, as shown on Figure 3. On each consecutive pulse rising edge, the LED current is divided by half to 50%, then 25%, 12.5%, 6.25% and 3.125% dimming levels. Pulses faster than the minimum TLO may be ignored and filtered by the device. Pulses longer than the maximum TLO may shutdown the device. The LED driver enters a “zero current” shutdown mode if EN/DIM is held low for 1.5ms or more. Figure 3. EN/DIM Digital Dimming Timing Diagram Table 1. LED Current Dimming Levels EN/DIM # of Pulses * RSET Gain LED Current EN = High 132 SET R V 6 . 0 132 × 1 st 66 SET R V 6 . 0 66 × 2 nd 33 SET R V 6 . 0 33 × 3 rd 16.5 SET R V 6 . 0 5 . 16 × 4 th 8.25 SET R V 6 . 0 25 . 8 × 5 th 4.125 SET R V 6 . 0 125 . 4 × 6 th 132 SET R V 6 . 0 132 × x th Device cycling through gain selection SET R V 6 . 0 GAIN × * The gain is changed on the rising edges of the EN/DIM input. EN/DIM LED Current Shutdown TSETUP THI TPWRDWN Shutdown TLO TLED 100% 50% 25% 12.5% 6.25% 3.12% 100% |
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