Datenblatt-Suchmaschine für elektronische Bauteile |
|
FAN5608 Datenblatt(PDF) 6 Page - Fairchild Semiconductor |
|
FAN5608 Datenblatt(HTML) 6 Page - Fairchild Semiconductor |
6 / 13 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5608 Rev. 1.0.5 • 8/8/06 6 Digital Static Control The FAN5608’s digital decoder allows selection of the following modes of operation: OFF, 5mA, 10mA, and 20mA per channel. A 0 1 0 1 B 0 0 1 1 ILED OFF 5mA 10mA 20mA Analog Static Control In Analog Mode, B1 and B2 inputs should be connected to GND or “0” logic. A1 and A2 control the LED current through an external resistor (R), as shown in Figure 4, or an external voltage (VEXT) input. The ILED value can be calculated using the formula or the graph below: EQ 2 where 1.2V < VEXT ≤ R(kΩ) x 0.020(mA) + 1.2V and the current multiplication ratio is according to the Electrical Specifications table. The R value should be in the (10kΩ to 50kΩ) range. 1.0 1.25 1.5 1.75 2 2.25 VEXT (V) R=50k R=10k 0 5 10 15 20 25 Figure 7. Analog Control PWM Control in Digital Dynamic Mode In Digital Dynamic Mode, if inputs A1 and/or A2 are externally driven by an open-drain output, the pull-up resistance should be less than 10kΩ to ensure less than 0.7V dropout; VA > (VIN – 0.7V), as required for HIGH logic level. The logic level HIGH (VH) and logic level LOW (VL) of the PWM signal should be: (VIN – 0.7V) < VH < VIN EQ 3 and 0 < VL < 0.6V. EQ 4 The frequency of the PWM signal should be within the 50Hz to 1kHz range, by default, or 30kHz at any input if the other input is kept HIGH. PWM Control in Analog Dynamic Mode In Analog Dynamic Mode, the logic level HIGH (VH) and logic level LOW (VL) of the PWM signal should be: VH = VEXT and 0 < VL < 0.6V. EQ 5 The frequency of the PWM signal should be in the range from 50Hz to 1kHz. The VEXT amplitude sets the maximum LED current, while the duty cycle of the PWM signal sets the average current between 0mA and ILED maximum. Open-Circuit Protection The FAN5608 has an internal over-voltage protection mechanism that prevents damage to the IC in a no-load condition. If CH1 and/or CH2 LEDs are enabled in an open-circuit condition, FAN5608 automatically sets the duty cycle to 25%. The output voltage can reach as high as 50V at maximum VIN (5.5V). Depending on the capacitor’s rating, the output capacitor may be at risk in this condition. Shutdown Mode Each channel can be independently disabled by applying LOW logic level voltage to the appropriate A and B inputs. When both channels are disabled, the FAN5608 enters shutdown mode and the supply current is reduced to less than 1μA. |
Ähnliche Teilenummer - FAN5608_06 |
|
Ähnliche Beschreibung - FAN5608_06 |
|
|
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 |