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LM3464 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI) |
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LM3464 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI) |
9 / 14 page PWM Dimming PWM dimming control can be realized by applying PWM dim- ming signal to the DIM terminal of the board directly. When the DIM pin is pulled to logic high, all output channles are enabled. When the DIM pin is pulled to logic low (GND), all output channels are turned OFF. In cascade operation, the DIM signal should apply to the MASTER unit only. The LM3464 on the MASTER unit propagates the PWM dimming signal on its DIM pin to the slave units one by one through the SYNC pin. PWM dimming control is allowed when thermal foldback control is activated. When PWM dimming and ther- mal foldback controls are required simultaneously, the PWM dimming frequency should be set at least ten times below the thermal foldback dimming frequency. The thermal foldback dimming signal reduced the LED currents according to the voltage level of the Thermal pin when the signal at the DIM pin is ‘high’ as shown in figure 7. 30127115 FIGURE 7. Thermal Foldback + PWM Dimming Control 9 www.national.com |
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