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LM3414HVSD Fiches technique(PDF) 11 Page - Texas Instruments |
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LM3414HVSD Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 30 page LED dimmed OFF ILED slew up time Time ILED 0 ILED regulated LM3414, LM3414HV www.ti.com SNVS678F – JUNE 2010 – REVISED NOVEMBER 2015 Feature Description (continued) 7.3.3 Peak Switch Current Limit The LM3414/HV features an integrated switch current limiting mechanism that protects the LEDs from being overdriven. The switch current limiter triggers when the switch current exceeds three times the current level set by RIADJ. Once the current limiter is triggered, the internal power switch turns OFF for 3.6 µs to allow the inductor to discharge and cycles repetitively until the overcurrent condition is removed. The current limiting feature is exceptionally important to avoid permanent damage of the LM3414/HV application circuit due to short circuit of LED string. 7.3.4 PWM Dimming Control The DIM pin of the LM3414/HV is an input with internal pullup that accepts logic signals for average LED current control. Applying a logic high (greater than 1.2 V) signal to the DIM pin or leaving the DIM pin open will enable the device. Applying a logic low signal (less than 0.9 V) to the DIM pin will disable the switching activity of the device but maintain VCC regulator active. The LM3414/HV allows the inductor current to slew up to the preset regulated level at full speed instead of charging the inductor with multiple restrained switching duty cycles. This enables the LM3414/HV to achieve high-speed dimming and very fine dimming control as shown in Figure 15 and Figure 16. Figure 15. LED Current Slew Up With Multiple Switching Cycle Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3414 LM3414HV |
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