Datenblatt-Suchmaschine für elektronische Bauteile |
|
FAN5608 Datenblatt(PDF) 1 Page - Fairchild Semiconductor |
|
FAN5608 Datenblatt(HTML) 1 Page - Fairchild Semiconductor |
1 / 17 page www.fairchildsemi.com REV. 1.0.3 6/28/04 Features • Two Independent Channels Drive up to Six LEDs per Channel • Adaptive Output Voltage Drive to Maximize Efficiency • PWM/PFM Mode of Operation of the Boost Circuit • Up to 85% Efficiency • Up to 2 × 20mA Output • Two Built-in DACs for Independent (Digital) Brightness Control for Both Channels • LED’s Current Can be Duty-Cycle-Modulated between 0 to 20mA • Digital, Analog, and PWM Brightness Control • 2.7V to 5V Input Voltage Range • 0.5MHz Operating Frequency (8MHz internal clock) • Soft Start • Low Shutdown Current: ICC < 1µA • LED Short Circuit Protection • Minimal External Components Needed • Available in space saving 8-lead and 12-lead MLP Packages. Applications • Cell Phones • Handheld Computers • PDAs, DSCs, MP3 Players • Keyboard Backlights • LED Displays Description The FAN5608 LED driver generates regulated output cur- rents from a battery with input voltage varying between 2.7V to 5V. An internal NMOS switch drives an external inductor, and a Schottky diode delivers the inductor’s stored energy to the load. Proprietary internal circuitry continuously monitors the currrent on both strings and automatically adjusts the generated output DC voltage to the lowest minimum value required by the LEDs string with the highest summarized forward voltage. This adaptive nature of the FAN5608 ensures operation at the highest possible efficiency. Soft start circuitry prevents excessive current drawn from the supply during power on. Any number of LEDs can be connected in series as long as the summed forward voltages do not exceed the specified operating output voltage range. Although it is not required to have an equal number of LEDs connected in series within each branch, the highest efficiency and best current regulation is always achieved when an equal number of LEDs are serially connected. In the FAN5608 device, two internal two-bit D/A converters provide independent programmability of each output channel current. Analog programming of the output current is also possible in the FAN5608. To do this, ground the "B" pins and connect a resistor between the "A" pins and a fixed supply voltage. The output current can then be programmed to any desired value within its specified range. The FAN5608DMPX/FAN5608MPX version uses a single FAN5608 Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter Typical Application Digital Brightness Control NN 2.7V to 5V CIN L = 4.7 µH V IN B1 A1 A2 IND IND GND B2 CH1 CH2 V OUT DAC Input For CH1 DAC Input For CH2 4.7 µF NC V OUT 2.7V to 5V L = 4.7 µH V IN B1 A1 A2 IND IND GND B2 CH1 CH2 V OUT DAC Input For CH1 DAC Input For CH2 4.7 µF NC NC CIN 4X4mm MLP-12 Package with internal Schottky diode Order Code: FAN5608DHMPX 4X4mm MLP-12 Package with external Schottky diode Order Code: FAN5608HMPX |
Ähnliche Teilenummer - FAN5608 |
|
Ähnliche Beschreibung - FAN5608 |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |