AL8400

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AL8400
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Description

The AL8400 is a 5-terminal adjustable Linear LED driver controller offering excellent temperature stability and output handling capability. The AL8400 simplifies the design of linear and isolated LED drivers. With its low 0.2V FB pin, it controls the regulation of LED current with minimal power dissipation when compared to traditional linear LED drivers. This makes it ideal for medium to high current LED driving. The AL8400 open-collector output can operate from 0.2V to 18V enabling it to drive external MOSFET and Bipolar transistors. This enables the MOSFET and Bipolar selection to be optimised for the chosen application. It also provides the capability to drive longer LED chains, by tapping V_CC from the chain, where the chain voltage may exceed 18V.

Features and Benefits

• Low reference voltage (V_FB = 0.2V)
• -40 to 125ºC temperature range
• 3% Reference voltage tolerance at 25°C
• Low temperature drift
• 0.2V to 18V open-collector output
• High power supply rejection
• (> 45dB at 300kHz)

Applications

• Isolated offline LED converters
• Linear LED driver
• LED signs
• Instrumentation illumination

Part Number	AL8400
Topology	Linear Controller
Minimum Supply Voltage V	2.2
Maximum Supply Voltage V	18
Max. VOUT V	18
LED Current Sense Voltage mV	200
Output Current mA	15
LED Current mA	Set by external transistor
Accuracy %	3
Frequency kHz
Efficiency %
Dimming
Temperature Range ºC	-40 to +125

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