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LM3464A Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer LM3464A
Bauteilbeschribung  LED Driver with Dynamic Headroom Control and Thermal Control Interfaces
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Hersteller  TI1 [Texas Instruments]
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SNVS652E – APRIL 2010 – REVISED JUNE 2011
System Operation
In order to provide failure protection to the LEDs, the rail voltage is pulled up by the LM3464/64A from a
relatively low voltage level at system startup until the rail voltage reaches certain preset level. Figure 16 shows
the change of the rail voltage of the LM3464/64A LED lighting system upon the primary power source is
powered.
The Lm3464/64A can be interfaced to an off-the-shelf converter to form a LED lighting system with simple
connections. Figure 14 shows the typical application circuit of a lighting system using the LM3464/64A with a fly-
back AC/DC converter. In this application, the output voltage of the AC/DC converter is mainly governed by a
voltage reference IC, LM431 and a voltage divider consists of R1 and R2. The LM3464/64A influences the output
voltage of the AC/DC converter by sinking current from the junction of the voltage divider (R1 and R2) to realize
dynamic headroom control.
The operation of the LM3464/64A upon startup can be divided into several phases according to the changes of
the rail voltage as shown in Figure 16. When the AC/DC converter is powered, the rail voltage increases and
stays steady when its native nominal output voltage, VRAIL(nom) is reached. This voltage is defined by the output
voltage feedback resistor divider of the AC/DC converter. At this voltage level, the LM3464/64A is powered
already. After certain delay defined by CDHC, the LM3464/64A starts to push the rail voltage up by sinking current
into the OutP pin from the voltage feedback node of the AC/DC converter until the rail voltage reaches
VDHC_READY. VDHC_READY is the highest rail voltage in normal operation and should be enough to turn on all the
LED strings with current regulation (defined by RSNSx). As VRAIL reaches VDHC_READY, the LM3464/64A turns on all
the output channels. This discharges the output capacitor of the primary power supply and causes the rail
voltage to decrease to certain level that system efficiency is maximized (VLED).
Figure 16. Changes of Rail Voltage Upon Power Up
Copyright © 2010–2011, Texas Instruments Incorporated
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