YB1509.pdf 데이터시트 (총 7 페이지) - 파일 다운로드 YB1509 데이타시트 다운로드

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YB1509
High-Power White LED Driver
Description
The YB1509 is a high-power boost
converter. An adjustable current limit, wide
range of input voltage, and up to 40V of
switch voltage are designed to drive white
LEDs back-lighting for large LCD panel. It
can drive up to 10 LEDs in series or 18
LEDs in parallel/series configuration.
The wide application VIN range makes
YB1509 suitable for many types of battery
applications such as Li-ions, Alkaline, or
Sealed Lead Acid batteries. The adjustable
inductor current optimizes the performance
for different output drive capability by an
external resistor.
The LED current is set by a resistor
connected to FB pin. The On/Of duty with
clock frequency from 1K to 100KHz at EN
pin can control the LED brightness
Features
„ 2V to 16V Input Voltage
„ 40V Maximum Output Voltage
„ Drive up to 18 White LEDs
„ Adjustable Inductor Current
„ 1µs Constant Off-time PFM Control
„ 1KHz to 100KHz PWM Dimming Control
Applications
„ PDA, Palmtops and Smart Phones
„ LCD Monitor
„ LCD TV
„ Portable DVD player
„ White LED backlighting
„ GPS navigation system
„ Handheld Game
Typical Application Circuit
VIN= 6 to14V
10uF
16V
10nF
6.3V
EN
Bypass
Iset
1K
VIN
YB1509
GND
22uH
SL12
4.7uF
35V
LX
BZV55-B 36
FB
2KOHM
Figure 1. Typical application circuit
YB1509 MRev.1.1
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RFB
60OHM
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Pin Configuration
YB1509
High-Power White LED Driver
GND
1
8 LX
VIN 2
Bypass 3
YB 1509
7 Iset
6 NC
FB 4
5 EN
M SOP8
Figure 2. Pin configuration
Pin Description
Table 1
Pin Name
Description
1 GND Signal and power ground.
2 VIN Input supply pin.
3 Bypass Internal compensation usage. A 10nF bypass capacitor is recommended.
4 FB Feedback input pin.
5 EN Enable control input. Active high.
6 NC No connect.
7 ISET Set inductor current.
8 LX Switch pin, connect to external inductor.
Ordering Information
Order Number
Package Type
YB1509
MSOP-8
Supplied as
Package Marking
2500 units Tape & Reel
YB1509
YB1509 MRev.1.1
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YB1509
High-Power White LED Driver
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Voltage......................................... -0.3V to 16V
LX Switch Voltage.................................... -0.3V to 40V
Junction Temperature Range........................... +150
Storage Temperature Range ............. -65 to +150
Lead Temperature............................................ +250
Input Supply Voltage.............................. 2.2V to 16V
Operating Temperature..................... -40 to +85
Electrical Characteristics
At TA=25 , VIN=6V, unless otherwise noted.
Table 2
Function Parameter
Conditions
Input Voltage Range
VFB Threshold Voltage
VFB Pin Bias Current
VFB=1.23V
Quiescent Current
VFB=1.5V, not switching
Quiescent Current in shutdown VEN=0V
Switching Off Time
Switching On VCE,SAT
LX Leakage Current
EN Logic Low Level
ISWITCH=300mA
VFB=1.5V, VLX=40V
EN pin voltage low
EN Logic High Level
EN pin voltage high
EN Input Bias Current
EN Input Bias Current
ISET Source Current
Inductor Peak Current
VEN=3V
VEN=0V
Rlimit=15K, Vin=12V, Vout=30V,
Iout = 150mA
Min Typ Max Units
2.2 16 V
1.21 1.23 1.25
V
180 250 nA
400 µA
10 µA
1 µs
220 330 mV
1 10 µA
0.4 V
1.8 VIN V
4.5 15
µA
1 µA
6 8 10 µA
1.4 1.5 1.6
A
YB1509 MRev.1.1
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YB1509
High-Power White LED Driver
Typical Characteristics
.
VIN=3 to 6V
10µF
16V
33µH
VIN
10nF
EN
Bypass
ISET
9.1K
YB1509
GND
LX
FB
SL12
RFB
60OHM
VIN=5 to 8V
4.7µF
35V
10µF
16V
EN
Bypass
ISET
10nF
1K
22µH
SL12
VIN
YB1509
GND
LX
FB
RFB
60OHM
4.7µF
35V
Figure 3. 8 LEDs in a Series
VIN=8 to 14V
10µF
16V
10nF
EN
Bypass
ISET
1K
10µH
SL12
VIN
YB1509
GND
LX
FB
RFB1
60OHM
4.7µF
35V
RFB2
60OHM
Figure 4. 10 LEDs in a Series
VIN=8 to 14V
10µF
16V
10nF
EN
Bypass
ISET
1K
33µH
SL12
VIN
YB1509
GND
LX
FB
RFB1
60OHM
4.7µF
35V
RFB2
60OHM
Figure 5. 2 Legs of 6 LEDs in a Series
Figure 6. 2 Legs of 9 LEDs in a Series
CH1: LX CH2: Inductor Current CH3: VOUT (18 LEDs)
Figure 7. Typical Switching Waveform
CH1: EN CH2: LX CH3: VOUT (18 LEDs)
Figure 8. PWM Brightness Control by EN
YB1509 MRev.1.1
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Functional Block Diagram
10nF
Charge Enable
EN
Bypass
VFB
1.23V
VREF
ISET
YB1509
High-Power White LED Driver
VBAT
CIN
VIN
Set Q
Reset
Off Time
Control
L1
SW
D1
Q1
Cout
GND
Figure 9. Block Diagram
60OHM
Functional Description
The YB1509 is a constant current
high-power white LED driver. It can drive up
to 10 LEDs in series or 18 LEDs in
parallel/series configuration. The IC uses a
peak current, 1µs off-time PFM scheme.
The inductor current ramp up when power
NPN is turn on. Once the inductor current
reaches the preset value determined by the
ISET pin, output power NPN is shut off and
the energy stored in inductor is delivered to
the output capacitor. Once the discharge
cycle is completed, the power NPN is on
again. If the FB voltage has not yet reached
the designated value of 1.23V, the inductor
current will be charged up again. This
charging and discharging sequence will
repeat itself until the FB voltage gets to the
designated value and triggers the on-off
latch to hold off the power NPN regardless
the inductor current value.
LED Current and Brightness control
The LED’s current is set by the resistor
connected at FB pin to GND using:
I LED
= 1.23V
RFB
LED’s brightness is accomplished by
applying a PWM signal with a frequency
range between 100Hz and 50KHz to the
EN pin.
Inductor Current Set
Using a resistor connected from ISET to
GND is able to set inductor current. An 8µA
current source is coming out of the YB1509
YB1509 MRev.1.1
www.yobon.com.tw
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