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YB1519 データシート(PDF) 5 Page - YOBON TECHNOLOGIES,INC.

部品番号 YB1519
部品情報  High-Power White LED Driver
PDF  7 Pages
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メーカー  YOBON [YOBON TECHNOLOGIES,INC.]
ホームページ  http://www.yobon.com.tw
Logo YOBON - YOBON TECHNOLOGIES,INC.

YB1519 データシート(HTML) 5 Page - YOBON TECHNOLOGIES,INC.

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YB1519
High-Power White LED Driver
YB1519 MRev.1.2
www.yobon.com.tw
5
Set
1.23V
VREF
Reset
Q
VFB
ISET
EN
SW
Charge Enable
VBAT
CIN
Cout
D1
Q1
60OHM
Off Time
Control
L1
VIN
Bypass
GND
10nF
Figure 9. Block Diagram
Functional Block Diagram
Functional Description
The
YB1519
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:
FB
LED
R
V
I
23
.
1
=
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



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