 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BD9420F Datasheet(PDF) 11 Page - Rohm |
|
||||||||||||||||||||||||||||||
BD9420F Datasheet(HTML) 11 Page - Rohm |
|
|
11 / 31 page  Datasheet Datasheet 11/28 TSZ02201-0F1F0C100300-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 31.Jan.2014 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9420F 3 ] [ ] [ ] [ A I V V ohm R LED VREF CL ●LED current setting (VREF pin, CLx pin) Please decide VREF pin input voltage first. When Analog dimming is performed, please be noted that VREF pin input voltage range is (0.6V ～ 3.0V), and decide the input voltage in normal operation. Basically, if VREF pin voltage is high, it will cause power dissipation of external PNP Tr become high, so it is preferred to set the VREF pin voltage lower. Later, VREF=0.9V will be set as basic. For example if you create 0.9V from REG75, it is possible to use resistive divider by setting 88kohm and 12kohm. The LED current detection is performed by CLx pin. CLx pin is controlled so that the voltage of 1/3V(typ.) of VREF voltage. If VREF=0.9V, CLx=0.3V to control external PNP Tr. Therefore, if 「RCL」 is set as a resistance which between CLx pin and GND, and VREF pin voltage is set as 「VVREF」, LED current 「ILED」can be calculated as below. For current setting, set at each channel. For this reason, in 1ch～3ch and 4ch～6ch, it is possible to change current by setting 「RCL」value. ●DCDC operation frequency setting (RT Pin) The operation frequency of DCDC output is set by resistance which connected to RT pin. ○The relationship between operation and RT resistance (ideal) 【Setting Example】 If DCDC frequency is set to be 200kHz, RRT as below: ] [ ] [ 15000 k kHz f R SW RT ] [ 75 ] [ 200 15000 ] [ 15000 k kHz kHz f R sw RT Above is an ideal equation which do not putted with correction terms. For accurate frequency setting, please confirm on the real system. But the frequency setting range is 100kHz～800kHz. Here, fsw＝DCDC converter oscillation frequency[kHz] |
Similar Part No. - BD9420F |
|
Similar Description - BD9420F |
|
|
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
