Electronic Components Datasheet Search |
|
BD1603NUV Datasheet(PDF) 6 Page - Rohm |
|
BD1603NUV Datasheet(HTML) 6 Page - Rohm |
6 / 9 page Technical Note 6/8 www.rohm.com 2011.02 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. BD1603NUV BD1603NUV VIN GND VOUT COUT 9. Brightness control Brightness control takes place in this LSI as follows. a) PWM The EN pin is turned ON or OFF repeatedly via the PWM signal. It is recommended that the PWM frequency is 100Hz or below. This frequency must be determined, fully evaluating the linearity of brightness to the PWM duty. Brightness control must take place as shown in “b” below if the rush current causes a problem when the EN pin is ON. Fig.15 PWM Brightness Control Fig.16 ON/OFF Pin Control Fig.17 ON/OFF Pin Control (4.5V, 100Hz) (5.0V, 100Hz) b) Switching the LED Current Switching the LED current takes place via the external switch. The constant must be determined, considering the ON resistance of the switch transistor. Fig18. Brightness Control via the External Transistor 10. Cautions on PCB Design BD1603NUV is equipped with a double charge pump. As the load current becomes larger, the input current also becomes larger. Wire a substrate in a way that the wiring impedance can be minimized. Special care should be taken for the input voltage, ground, output and flying capacitor connection pin. Wire the ground of an output capacitor (COUT) near the GND pin of this LSI. Position a bypass capacitor to be inserted between VIN (input voltage) and GND near this LSI and wire it near the VIN and GND pins of this LSI. Heat radiation is controlled by the wiring status to the back metal. Connect it with GND plane as much as possible by a wide area. About the FSEL terminal and the VSEL terminal, process fixed logic by the PCB pattern when using it by fixed logic. Fig19. How to Ground in PCB Design BD1603NUV EN PWM signal BD1603NUV VOUT |
Similar Part No. - BD1603NUV |
|
Similar Description - BD1603NUV |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
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 |