DC-DC Converter. YB1508 Datasheet

YB1508 Datasheet PDF, Equivalent


Part Number

YB1508

Description

Step-up DC-DC Converter

Manufacture

YOBON TECHNOLOGIES

Total Page 7 Pages
PDF Download
Download YB1508 Datasheet PDF


YB1508 Datasheet
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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 Datasheet
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Pin Description
YB1508
Step-up DC-DC Converter , White LED Driver
Figure 2YB1508 SOT23-5
Pin Designator
Table 1 :
Pin Name
1 SW
2 GND
3 FB
4 CTRL
5 VIN
Description
Switching Pin. This is the collector of the internal NPN power switch. Connect to
inductor and diode. Minimize the metal trace area connected to this pin to reduce
EMI.
Ground Pin. Connect directly to local ground plane.
Feedback Pin. Reference voltage is 200mV. Connect LEDs and a resistor at this
pin. LED current is determined by the resistance and CTRL voltage.
Shutdown Pin and Dimming Control pin.
A. VCTRL > 1.8V generates full-scale LED current
B. VCTRL < 0.4V chip is off
C. Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current
Input Supply Pin. Bypass this pin with a capacitor as close to the device as
possible.
Ordering Information
Table 2:
Order Number
High Ovp YB1508
Low Ovp YB1508P
Package Type
SOT23-5
SOT23-5
Supplied as
3000 units Tape & Reel
3000 units Tape & Reel
Package Marking
Y58
Y58P
YB1508 MRev1.4
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Features Datasheet pdf www.DataSheet4U.com YB1508 Step-up DC-D C Converter , White LED Driver Features „ „ „ „ „ „ „ „ „ Descriptio n The YB1508 is a step-up DC-DC convert er, acting as current source to drive u p to 8 white LEDs in series. Series con necting of the LEDs provides identical LED currents resulting in uniform brigh tness and eliminating the need for ball ast resistors. The light intensity of t hese LEDs is proportional to the curren t passing through them. Additional feat ures include output over voltage protec tion to prevent device damage due to fa ulty LED or open circuit caused by abno rmal conditions, and one-pin shutdown a nd multiple methods of dimming control. The YB1508 switches at a fixed frequen cy of 1MHz, allowing the use of tiny ex ternal components and low input noise a nd ripple. To control LED brightness, t he LED current can be pulsed by applyin g a PWM (pulse width modulated) signal with a frequency range of 100Hz to 50KH z to the CTRL pin. The YB1508 is available in a low profile 5-lead SOT-2.
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