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FAN5610 Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte FAN5610
Spiegazioni elettronici  LED Driver for White, Blue or any Color LED
Download  10 Pages
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5610 Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor

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www.fairchildsemi.com
REV. 1.0.2 10/28/03
Features
• LED Driver for 4 Parallel-connected LEDs
• Low Voltage Drop (<350mV) to Support Direct Li-ion
Applications with Low VF LEDs
• Independent Control Loop for Each LED
• Regulated, Matched Constant Current in LEDs
• No External Components
• No EMI, No Switching Noise
• Built-in DAC for Digital and PWM Brightness Control
• Up to 91% Maximum Efficiency
• Up to 84mA (21mA/LED) Bias Current
• 2.7V to 5.5V Input Voltage Range
•ICC < 1µA in Shutdown Mode
• 3mmX3mm MLP-8 Package
Applications
• Cell Phones
• Handheld Computers
• PDA, DSC, MP3 Players
• LCD Display Modules
• Keyboard Backlight
• LED Displays
Description
The FAN5610 generates matched current source drives for a
maximum of four LEDs. Since each LED current source has
its own self-regulating loop, precise current matching is
maintained even if there is a substantial forward voltage
spread among the LEDs. LED pre-selection therefore is not
required. In order to minimize voltage drop, and maximize
efficiency, the value of the internal current sense resistors
connected in series with the LEDs is very low (10
Ω). This is
an important consideration for direct DC-driven white LEDs
in battery-powered systems.
The LEDs’ current can be set to 0mA (OFF Mode), 7mA,
14mA, and 21mA with a built-in two-bit digital-to-analog
converter. Customized current settings can also be used.
When the control bits are set to zero, the internal circuitry is
disabled and the quiescent current drops below 1µA.
Both digital input lines (A, B) can be pulse-width-modulated
(PWM). Using PWM, any value of average LED current can
be obtained within the 1 to 20 mA range. The FAN5610 is
available in an 8-lead 3X3 MLP package.
FAN5610
LED Driver for White, Blue or any Color LED
Typical Application
D1
D2
D3
D4
V
IN
V
IN
GND
FAN5610
IN B
IN A
D
A
C


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