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AAT3193IJQ-3-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3193IJQ-3-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 18 page  AAT3193 3-Channel Charge-Pump LED Driver ChargePumpTM PRODUCT DATASHEET 3193.2008.07.1.3 11 www .analogictech.com Data EN Rising Edges D1-D3 Current (mA) 11 20 2 2 17.3 3 3 14.7 44 12 5 5 9.3 6 6 6.7 77 4 8 8 1.3 Table 2: AAT3193-2 LED Current Settings. S2Cwire Interface Data Code 0.00 5.00 10.00 15.00 20.00 1234 567 8 Figure 3: AAT3193-2 Current Control Profile. Data EN Rising Edges D1-D3 Current (mA) 11 20 2 2 13.3 3 3 6.7 4 4 0.87 Table 3: AAT3193-3 LED Current Settings. S2Cwire Interface Data Code 0.00 5.00 10.00 15.00 20.00 12 34 Figure 4: AAT3193-3 Current Control Profile. PWM Control (AAT3193-4 only) PWM (Pulse Width Modulation) is an industry standard technique of controlling LED brightness by modulating the conduction duty cycle of the LED current. LED brightness is determined by the average value of the PWM signal multiplied by the LED’s intensity where intensity is proportional to the LED drive current. A PWM control signal can be applied into the EN/PWM pin of the AAT3193-4. By changing the duty cycle of the PWM sig- nal from 100% (logic high) to 10%, LEDs sink current can be programmed from 20mA to 2.4mA. To save power when not used, AAT3193-4 can be shutdown by holding the EN/PWM pin low for 1ms. Lastly, Table 4 and Figure 5 illustrate the AAT3193-4’s LED current control profile as a function of a PWM con- trol signal. EN/PWM Duty Cycle D1-D3 Current (mA) 100% 20 90% 17.9 80% 15.9 70% 14 60% 12.1 50% 10.1 40% 8.2 30% 6.3 20% 4.3 10% 2.4 Table 4: AAT3193-4 LED Current Settings (RSET = 14.3kW, fPWM = 50kHz). EN/PWM Input Pin Duty Cycle (%) 0.00 5.00 10.00 15.00 20.00 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Figure 5: AAT3193-4 Current Control Profile (RSET = 14.3kΩ, fPWM = 50kHz). |
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