công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
BD1206GUL bảng dữ liệu(PDF) 7 Page - Rohm |
|
BD1206GUL bảng dữ liệu(HTML) 7 Page - Rohm |
7 / 13 page Technical Note 7/12 BD1206GUL www.rohm.com 2010.02 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. b) LED current level The interface records rising edges of the EN pin and decodes them into 16 different indicated in following table. Data Output current [mA] Data Output current [mA] 1 20.0 9 5.0 2 17.0 10 4.0 3 14.0 11 3.0 4 12.0 12 2.0 5 10.0 13 1.0 6 8.5 14 0.5 7 7.0 15 0.25 8 6.0 16 0.125 (2) Charge pump a) Description of operations Pin voltage comparison takes place at Vout control section, and then Vout generation takes place so that the LED cathode voltage with the highest Vf is set to 0.15V. A boost rate is changed automatically to a proper one at the Charge Pump Mode Control section so that operation can take place at possible low boost rate. In addition, when the VOUT output is short-circuited to GND, the leak current is suppressed via the over current protection function. b) Soft start function BD1206GUL have a soft start function that prevents the rush current. Soft Start Ordinal mode EN/LED* VOUT ILED TOFF * EN/LED is an internal enable Fig.7 Soft Start c) Automatic boost rate change The boost rate automatically switches to the best mode. * (×1 mode ×1.5 mode) or (×1.5 mode ×2 mode) If a battery voltage drop occurs BD1206GUL cannot maintain the LED constant current, and then mode transition begins. * (×1.5 mode ×1 mode) or (×2 mode ×1.5 mode) If a battery voltage rise occurs, VOUT and VBAT detection are activated, and then mode transition begins. (3) UVLO (Under Voltage Lock Out) If the input voltage falls below 2.2V(Typ.), BD1206GUL is shut down to prevent malfunction due to ultra-low voltage. (4) OVP (Over Voltage Protection) This circuit protects this IC against damage when the C/P output voltage (VOUT) rises extremely for some external factors. (5) Thermal shutdown (TSD) To protect this IC against thermal damage or heat-driven uncontrolled operations, this circuit turns off the output if the chip temperature rises over 175ºC. In addition, it turns on the output if the temperature returns to the normal temperature. Because the built-in thermal protection circuit is intended to protect the IC itself, the thermal shutdown detection temperature must be set to below 175ºC in thermal design. |
Số phần tương tự - BD1206GUL |
|
Mô tả tương tự - BD1206GUL |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất 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 |