![]() |
Electronic Components Datasheet Search |
|
LDS8846 Datasheet(PDF) 6 Page - IXYS Corporation |
|
|
LDS8846 Datasheet(HTML) 6 Page - IXYS Corporation |
6 / 12 page ![]() LDS8846 © 2009 IXYS Corp. 6 Doc. No. 8846DS, Rev. N1.6 Characteristics subject to change without notice BLOCK DIAGRAM Figure 2. LDS8846 Functional Block Diagram BASIC OPERATION The device starts operating if the EN pin is set logic HIGH and input voltage is higher that under voltage protection lockout threshold. The low dropout PowerLite ™ Current regulator performs well at input voltages up to 50 mV greater than the LED forward voltage significantly increasing the driver’s efficiency. Input pins EN, CTRL0, CTRL1, and CTRL2 may be either logic LOW or HIGH during power-up. However, logic voltage should never exceed input voltage VIN, and these pins should not be left float. LED Current Setting The desired current value in each of the four LED is set by external resitor RSET connevted between ISET pin and ground.. The LED current is 400 times greater than the current through RSET and can be estimated (in mA) by following equation: SET SET LED R V x I 400 , where VSET =1.2V, and RSET is its resistance in kohms. RSET value for typical ILED current is shown at the table below. ILED, mA RSET, kΩ Nearest standard 1% value 5 96 95.3 10 48 47.5 15 32 31.6 or 32.4 20 24 23.7 or 24.3 25 19.2 19.1 30 16 15.8 or 16.2 The average current value may be decreased using PWM signal applied to either CTRL0, CTRL1 or CTRL2 pin. The LDS8846 allows modulation frequiencies in the range from 100 Hz to 5 kHz with duty cycles from 100% to 1% and from 5 kHz to 30 kHz with duty cycles from 100% to 10%. Modulation frequiencies lower than 100 Hz are not recommended especialy at short duty cycles because LED flicker may be visible. If CTRL1 and CTRL2 pins are logic HIGH and PWM signal applies to CTRL0 pin, then all four LEDS are dimming synchronously. If CTRL0 and CTRL2 pins are logic HIGH and PWM signal applies to CTL1 pin, then LEDs from LED1 to LED3 are dimming, while LED4 is always off. |
Similar Part No. - LDS8846 |
|
Similar Description - LDS8846 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |