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AS3492

Part Number	AS3492
Manufacturer	ams
Description	Highly Efficient 2-10 LEDs Backlight Driver
Published	Feb 18, 2015
Detailed Description	valid Datasheet AS3492 Highly Efficient 2-10 LEDs Backlight Driver with 2 PWM Inputs 1 General Description The AS3492...
Datasheet	AS3492 PDF File

Overview

valid Datasheet AS3492 Highly Efficient 2-10 LEDs Backlight Driver with 2 PWM Inputs 1 General Description The AS3492 is an inductive highly efficient DCDC boost converter.
The DCDC converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems.
A predictable startup is guaranteed even with very low duty cycle PWM input signals.
The voltage on the output capacitor is controlled to minimize ripple and to avoid any acoustic effects for low frequency PWM input signals.
The output of the DCDC converter is used for five current sources connected to up to 10 LEDs.
If a current source is not required, it shall be connected to VOUT or GND - the AS3492 detects this condition and disables this current source automatically; this keeps the efficiency of the system constantly high.
The AS3492 is controlled by two enable inputs, ON13 and ON45.
These inputs can also be used to connect a PWM input (like DLS or DBC).
The AS3492 includes several protection functions like undervoltage lockout, overcurrent and overtemperature.
No microvias are required to assemble the AS3492 if only four channels are used and ON13=ON45.
The AS3492 is available in a space-saving WL-CSP package measuring only 1.
7x1.
4x0.
5mm and operates over the -30ºC to +85ºC temperature range.
Figure 1.
AS3492 Typical Operating Circuit 2 Key Features 2 MHz DCDC Boost converter - Small 4.
7µH external coil - Very high system efficiency of 86% (DCDC and current sources combined) - Very low voltage changes on output to avoid acoustic noise on output capacitor even with PWM - Smooth startup even under low duty cycle PWM conditions Five Current sources up to 25mA - Low voltage compliance (150mV) - High side current source to simplify layout and thermal management of the LEDs - Automatically detect and disable failing or not used LEDs to keep efficiency high - Current matching <4% - Current accuracy <7.
5% Excellent LED current output ripple <500µA ...

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