|
|
|
부품번호 | YB1508 기능 |
|
|
기능 | Step-up DC-DC Converter | ||
제조업체 | YOBON TECHNOLOGIES | ||
로고 | |||
www.DataSheet4U.com
YB1508
Step-up DC-DC Converter , White LED Driver
Description
Features
The YB1508 is a step-up DC-DC converter,
acting as current source to drive up to 8
white LEDs in series. Series connecting of
the LEDs provides identical LED currents
resulting in uniform brightness and
eliminating the need for ballast resistors.
The light intensity of these LEDs is
proportional to the current passing through
them. Additional features include output over
voltage protection to prevent device damage
due to faulty LED or open circuit caused by
abnormal conditions, and one-pin shutdown
and multiple methods of dimming control.
The YB1508 switches at a fixed frequency of
1MHz, allowing the use of tiny external
components and low input noise and ripple.
To control LED brightness, the LED current
can be pulsed by applying a PWM (pulse
width modulated) signal with a frequency
range of 100Hz to 50KHz to the CTRL pin.
The YB1508 is available in a low profile 5-lead
SOT-23 package.
Typical Application Circuit
2.7V to 9V input range
Adjustable output voltage up to 40V
Built in internal switch
Inherently matched LED current
Fixed frequency of 1MHz PWM
operation
Open LED protection
Low profile 5-Lead SOT-23 package
High efficiency: over 80% at 3.6V
input voltage
Drives up to 8 white LEDs
Applications
LCD Display Module
OLED panel/sub-panel
White LED Backlighting
Digital Camera
Cellular Phone
Portable Application
YB1508 MRev1.4
Figure 1:Typical Application Circuit
WWW.YOBON.COM.TW
1
www.DataSheet4U.com
YB1508
Step-up DC-DC Converter , White LED Driver
Functional Block Diagram
Figure 3. Block Diagram
Application Information
Operation
The operation of YB1508 can be
understood by referring to the block
diagram in Figure 3. A voltage
proportional to the switch current is added
to a ramp output and the resulting sum is
fed into the positive terminal of the PWM
comparator. When this voltage exceeds
the level of the comparator negative input,
the peak current has been reached, and
the SR latch is reset and turns off the
power switch. The voltage at the negative
input of the comparator comes from the
output of the error amplifier. The error
amplifier sets the correct peak current
level to keep the output in regulation. If
the error amplifier’s output increases,
more current is delivered to the output; if it
decreases, less current is delivered.
Inductor Selection
A 22uH inductor is recommended for most
YB1508 applications. Although
small size and high efficiency are major
concerns, the inductor should have low
core losses at 1MHz and low DCR
(copper wire resistance).
Capacitor Selection
The small size of ceramic capacitors
makes them ideal for YB1508
applications. X5R and X7R types are
recommended because they retain their
capacitance over wider voltage and
temperature ranges than other types.
Diode selection
To maintain high efficiency, the average
current rating of the schottky diode
should be larger than the peak inductor
current, IPK. Schottky diode with a low
forward drop and fast switching speeds
are ideal for increasing efficiency in
portable applications. The reverse
breakdown voltage of the schottky diode
must be larger than the output voltage.
YB1508 MRev1.4
WWW.YOBON.COM.TW
4
4페이지 www.DataSheet4U.com
YB1508
Step-up DC-DC Converter , White LED Driver
SOT-25 Package Information
All the contents in this datasheet are not assuming any responsibility for use of
any circuitry described, no circuit patent license are implied and Yobon reserves
the right at any time without notice to change said circuitry and specifications.
YB1508 MRev1.4
WWW.YOBON.COM.TW
7
7페이지 | |||
구 성 | 총 7 페이지수 | ||
다운로드 | [ YB1508.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
YB1506 | Step-Up DC-DC Converter | Yobon |
YB1508 | Step-up DC-DC Converter | YOBON TECHNOLOGIES |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |