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YB1303 데이터시트 PDF




YOBON TECHNOLOGIES에서 제조한 전자 부품 YB1303은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 YB1303 기능
기능 Low Dropout LED Driver
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YB1303 데이터시트, 핀배열, 회로
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, 반도체, 판매, 대치품
YB1303
Low Dropout LED Driver
Typical Performance Characteristics
VIN=3.3 to 5.5V, VEN=3V, TA=25°C, unless otherwise noted. VF is LED forward voltage.
Iset vs. Control Voltage
(RSET=17.4k, Vcathode=0.3V)
160
140
120
100
80
60
40
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Vcontrol (V)
LED Current vs. LED Cathode Voltage
(Vcontrol=3V, VEN=3V)
22
20
Rset=17.4k
18 Iset=100uA
16
14
12
10
8
6
4
2
0
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20
Cathode Voltage (V)
22
20
18
16
14
12
10
8
6
4
2
0
0
LED Current vs. Enable Voltage
(Vcontrol=3V, Vcathode=0.3V, Rset=17.4k)
12345
VEN Voltage (V)
6
LED Current vs. Rset
(VEN=3V, Vcontrol=3V)
45
40
35
30
Vcathode=0.3
25 Vcathode=0.5
20 Vcathode=1
15
10
5
0
0 10 20 30 40 50 60 70 80
Rset (kOhms)
Control Voltage Transient Response
Enable Voltage Transient Response
YB1303 Rev.1.0
www.yobon.com.tw
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YB1303 전자부품, 판매, 대치품
YB1303
Low Dropout LED Driver
Example 3:
Drive white, blue, red, amber LEDs
string
Assuming boost circuit, or existing voltage
bus, the YB1303 can be used to drive a
whole string of LEDs and flexible
brightness control – whether using analog
or PWM (Notes).
LED Brightness Control
The YB1303 LED drivers feature analog
and PWM controls to give designers
flexible brightness control. These control
methods can be applied to the circuit in two
different ways which provide flexible
solution. To determine the value of RSET,
use the “ISET vs. VCTR” graph under the
“typical characteristics” section.
-VDROP < 0.3V
-VIN_MIN = N×VF + VDROP
- VIN_MAX = N×VF + 6V
-VIN (@5mA typical) ~3.3V
Where VIN = Existing Bus / Boost Voltage
Key advantages:
y No need for current matching resistors
and discrete transistor for brightness
control.
Scenario 1 - Analog
Set VCONTROL and RSET for LED current
ILED=200×(VCONTROL-VCTR)/RSET
Scenario 2 – PWM - 1
ILED=200×(VCONTROL-VCTR)/RSET
VCONTROL = PWM
y Amplitude sets maximum LED current
y Pulse width controls between 0 and
maximum
Notes:
1. Whether using analog or PWM signal, please
notice to avoid from exceeding the absolute
maximum rating claimed in this document.
2. EN must be turned on prior to VIN (delivered by
boost circuit or existing bus) and avoid from
VIN > 6V when EN is off.
Scenario 3 – PWM - 2
ILED ~ 200×ISET
VEN = PWM
y Amplitude has no effect on current
y Pulse width controls between 0 and
maximum
YB1303 Rev.1.0
www.yobon.com.tw
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