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PDF YB1303 Data sheet ( Hoja de datos )

Número de pieza YB1303
Descripción Low Dropout LED Driver
Fabricantes YOBON TECHNOLOGIES 
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YB1303
Low Dropout LED Driver
Description
The YB1303 provides a simple solution for
driving three channels of any color LEDs
with current matching ability. The ultra low
dropout LED driver features higher peak
efficiency and very low shutdown current.
The LED current can be adjusted by an
external resistor or the control voltage. The
YB1303 can work independently or
combine with any boost converters which
need to have current matching function for
LED drivers. The YB1303 is available in
6-pin tiny SC70-6 package.
Features
„ LED Drivers for Parallel Connected
LEDs
„ Only One External Resistor is Needed
„ PWM and Analog Brightness Control
„ No EMI and Switching Noise
„ Power Saving Shutdown Mode (<0.1μA)
„ Small Footprint SC70-6 Package
Applications
„ LCD Display Modules
„ Keyboard Backlight
„ PDA, DSC, MP3 players
„ LED Displays
„ Handheld Computers
„ Cell Phones
Typical Application Circuit
YB1303 Rev.1.0
Figure 1: Typical Application Circuit
www.yobon.com.tw
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YB1303 pdf
YB1303
Low Dropout LED Driver
Application Information
Analog Dimming Control Table
Table 4
VEN=3V, VCONTROL=3V
ILED (mA)
RSET (kΩ)
5 75
10 34
15 24
20 17.4
25 13
voltage. The lower the VLED voltage, the
higher the system efficiency. The system
efficiency can be calculated as follows:
Efficiency = (VIN-VCATHODE) / VIN
Thermal Considerations
At any given ambient temperature, the
maximum package power dissipation can
be determined by the following equation:
Table 5
VEN=3V, RSET=17.4k
ILED (mA)
VCONTROL (V)
5 1.5
10 2.1
15 2.5
20 3
25 3.6
PD(MAX) = [TJ(MAX)-TA] / θJA
Constraints for the YB1303 are maximum
junction temperature TJ(MAX)=125 , and
package thermal resistance, θJA=300/W.
The maximum total LED current for
YB1303 depends on package power
Setting the LED Current
The LED current can be set by the control
voltage and the RSET resistor from the
following equation.
ILED=200×(VCONTROL-VCTR)/RSET
The suggested values and relations
between VCONTROL and RSET can also be
found in the diagram of typical
characteristics and table 4 and table5. The
LED brightness can be controlled by either
the above equation or applying a PWM
signal to the EN pin. The driving signal
dissipation and the LED cathode voltage at
TJ(MAX). At 85, PD(MAX)=133mW. At TA =
25, PD(MAX)=333mW.
The maximum current is calculated by the
following equation:
ILED < (PD(MAX) / VLED(MAX))
For example, if ILED = 60mA, and TA = 85,
VLED(MAX) = 2.2V.
If the ambient temperature were to
increase, the internal die temperature
would increase, and the device would be
damaged.
frequency should be greater than 100Hz to
avoid flickering, and increased to more
than 1MHz if necessary.
Efficiency Considerations
Application Examples
The ultra-low voltage drop across the
YB1303 allows the devices to drive white,
blue and any color LEDs in a wide range of
The YB1303 featured low drop out can
achieve excellent efficiency performance.
input voltages. The driver can be used in
many applications presented in this
The efficiency is mainly dominated by VLED document, due to their similar operation.
YB1303 Rev.1.0
www.yobon.com.tw
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