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CAT3643HV3-T2 Datasheet(PDF) 4 Page - Catalyst Semiconductor |
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CAT3643HV3-T2 Datasheet(HTML) 4 Page - Catalyst Semiconductor |
4 / 17 page CAT3643 Doc. No. MD-5022 Rev. E 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice RECOMMENDED EN/DIM TIMING For 2.4V ≤ VIN ≤ 5.5V, over full ambient temperature range -40ºC to +85ºC. Symbol Name Conditions Min Typ Max Units TSETUP EN/DIM setup from shutdown 10 μs TLO EN/DIM program low time 0.2 100 μs THI EN/DIM program high time 0.2 μs TPWRDWN EN/DIM low time to shutdown 1.5 ms TLED LED current settling time 40 μs Figure 1. EN/DIM Digital Dimming Timing Diagram LED Current Setting The nominal LED current is set by the external resistor connected between the RSET pin and ground. Table 1 lists standard resistor values for several LED current settings. LED Current (mA) RSET (kΩ) 2 40.0 5 15.8 10 7.87 15 5.23 20 4.02 25 3.16 30 2.67 Table 1. Resistor RSET and LED Current 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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