 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LP3382 Datasheet(PDF) 7 Page - Lowpower Semiconductor inc |
|
||||||||||||||||||||||||||||||
LP3382 Datasheet(HTML) 7 Page - Lowpower Semiconductor inc |
|
|
7 / 9 page  Preliminary Datasheet LP3382 LP3382 – 01 Version 1.0 Datasheet OCT.-2011 www.lowpowersemi.com Page 7 of 9 PWM signal should be higher than the maximum enable voltage of EN pin, in order to let the dimming control perform correctly. Cout 1uF Cin 10uF 10uH R1 12 Vin R2 100k SS0520 PWM EN 4 FB 3 Vin 6 OVP 5 LP3382 0-200KHz b. Using a DC Voltage Using a variable DC voltage to adjust the brightness is a popular method in some applications. The dimming control using a DC voltage circuit is shown in Figure 4. According to the Superposition Theorem, as the DC voltage increases, the voltage contributed to VFB increases and the voltage drop on R2 decreases, i.e. the LED current decreases. For example, if the VDC range is from 0V to 2.8V, the selection of resistors in Figure 4 sets dimming control of LED current from 20mA to 0mA. Cout 1uF 10uH Cin 10uF R1 12 Vin R3 56K R2 6.8K VDC SS0520 R4 100k ON/OFF EN 4 FB 3 Vin 6 OVP 5 LP3382 c. Using a Filtered PWM signal Another common application is using a filtered PWM signal as an adjustable DC voltage for LED dimming control. A filtered PWM signal acts as the DC voltage to regulate the output current. The recomended application circuit is shown in the Figure 6. In this circuit, the output ripple depends on the frequency of PWM signal. For smaller output voltage ripple (<100mV), the recommended frequency of 2.8V PWM signal should be above 2kHz. To fix the frequency of PWM signal and change the duty cycle of PWM signal can get different output current. According to the application circuit of Figure 5, output current is from 20.5mA to 5.5mA by adjusting the PWM duty cycle from 10% to 90%. Cout 1uF 10uH Cin 10uF Vin R4 100k SS0520 ON/OFF EN 4 FB 3 Vin 6 OVP 5 LP3382 PWM R2 6.8K R1 10 R3 56K R69 100K C3 0.1uF (0-100KHz) |
Similar Part No. - LP3382 |
|
Similar Description - LP3382 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
