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LM3414HVSD データシート(PDF) 11 Page - Texas Instruments

部品番号 LM3414HVSD
部品情報  Common Anode-Capable Constant Current Buck LED Driver
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LM3414HVSD データシート(HTML) 11 Page - Texas Instruments

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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
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