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PDF YB1509 Data sheet ( Hoja de datos )
| Número de pieza | YB1509 | |
| Descripción | High-Power White LED Driver | |
| Fabricantes | YOBON TECHNOLOGIES | |
| Logotipo |  |
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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
www.yobon.com.tw
RFB
60OHM
1
1 page  
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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
5
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet YB1509.PDF ] | |
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