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LM3520

Part Number	LM3520
Manufacturer	National Semiconductor
Description	Integrated White LED Driver
Published	Apr 16, 2005
Detailed Description	LM3520 Integrated White LED Driver with Organic LED Display Power Supply PRELIMINARY February 2005 LM3520 Integrated W...
Datasheet	LM3520 PDF File

Overview

LM3520 Integrated White LED Driver with Organic LED Display Power Supply PRELIMINARY February 2005 LM3520 Integrated White LED Driver with Organic LED Display Power Supply General Description The LM3520 is a dual step-up DC/DC converter, designed to drive up to 5 white LEDs with a constant current and to power an organic LED display with a constant voltage.
A single external resistor is used to set the maximum LED current.
The LED current can be adjusted by applying a PWM signal to the EN pin.
For higher efficiency the LM3520 operates with pulse frequency modulation (PFM) control scheme when the sub-display is enabled.
When Main display is enabled, the device is operating in PWM mode.
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