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LM3464A データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部品番号 LM3464A
部品情報  LED Driver with Dynamic Headroom Control and Thermal Control Interfaces
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3464A データシート(HTML) 10 Page - National Semiconductor (TI)

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30115003
FIGURE 1. Typical Application Circuit with Fly-Back AC/DC Converter
Overview
The LM3464/64A is a four channel linear current regulator
designed for LED lighting systems with wide input voltage
range, high speed PWM and thermal foldback dimming con-
trol interface. The LM3464/64A incorporates a Dynamic
Headroom Control (DHC) technology which maximizes over-
all efficiency of the lighting system by adjusting the output
voltage of the primary power source dynamically. Linear cur-
rent regulation secures high accuracy output current, LED
and system reliability. High speed PWM dimming provides the
flexibility of brightness control while maintaining constant col-
or temperature of the light. The thermal foldback feature
enables the LM3464/64A to manage the temperature of the
LED heat sink or system chassis with a simple NTC/PTC
temperature sensor. The thermal foldback input can also be
used as an analog dimming control input to adapt to other
sensors easily, such as ambient light sensor.
Dynamic Headroom Control (DHC)
Operation Principles of DHC
Dynamic Headroom Control is a technology that aims at max-
imizing the overall system efficiency by altering the supply
voltage to the LED(s) dynamically in respect to the charac-
teristics of the LED(s). In the LM3464/64A, DHC is facilitated
by connecting a resistor in between the OutP pin of the
LM3464/64A and the voltage feedback node of the primary
power supply (AC/DC) as shown in Figure 2.
30115004
FIGURE 2. Circuitry of the DHC Mechanism
For example, in steady state, when all the output channels
are in regulation and the forward voltage of any LED string
decreases due to temperature raise, the drain voltage of the
corresponding channel (DRx) increases to exceed the default
0.9V typical headroom voltage in order to maintain constant
output current. As the drain voltage increases, the voltage of
CDHC increases and the current sink into the OutP pin de-
creases. This will finally result in decrease of rail voltage
(V
RAIL) until the corresponding DRx voltage returns to mini-
mum level.
www.national.com
10


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