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YB1508 데이터시트 PDF




YOBON TECHNOLOGIES에서 제조한 전자 부품 YB1508은 전자 산업 및 응용 분야에서
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부품번호 YB1508 기능
기능 Step-up DC-DC Converter
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YB1508 데이터시트, 핀배열, 회로
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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 1Typical Application Circuit
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YB1508 pdf, 반도체, 판매, 대치품
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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
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YB1508 전자부품, 판매, 대치품
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
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