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Part Number
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LM3519 |
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Manufacturer
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National Semiconductor |
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Description
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High Frequency Boost White LED Driver |
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Published
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Sep 29, 2005 |
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Detailed Description
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LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control
September 2005
LM3519 High Frequen...
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Datasheet
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LM3519
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Overview
LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control
September 2005
LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control
General Description
The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices.
The LED current is internally set to 20mA.
The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs.
Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz.
The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz, minim...
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