YB1315 Datasheet, PDF (6/10 Pages) YOBON TECHNOLOGIES,INC. – High Efficiency Charge Pump White LED Driver

Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Function Block
PGND VOUT
7
8
C1+ 10
C1- 11
C2+ 9
C2- 12
VIN 13
1x/1.5x
Charge Pump
Current Sinks
2 D5
3 D4
4 D3
5 D2
6 D1
Reference
EN1 15
EN2 16
UVLO
Control
14
GND
OVP
1 ISET
Figure 3: Function Block
Functional Description
The YB1315 uses a multi-mode fractional
charge pump to generate a supply voltage
and a precise sink circuitry to ensure a
constant driving current for each LED. The
charge pump operates in either 1x mode,
or 1.5x mode, depending on the input
voltage and output current loading. The
overall power consumption is best
optimized by automatically switching
among the 2 different operation mode.
The charge pump is possible to generate a
total output current of 125mA or more,
25mA for each LED. But it is recommended
to operate the device under total 120mA.
YB1315 Rev.0.1
www.yobon.com.tw
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