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DN66 Datasheet

An OLED bias supply

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DN66
An OLED bias supply for a clamshell handset sub display
Description
Portable applications such as cell phones are becoming increasingly complex with more and
more features designed into every generation. One popular feature is to replace the STN sub
display with an OLED sub display. OLED displays have infinite contrast ratio and are self-
illuminating. This gives the handset manufacturer two key advantages, the first is lower power
consumption and the second is a slimmer display. One disadvantage with OLED sub displays over
LCD sub displays is the higher leakage current when not in use, which is the majority of the time.
The way to overcome this issue is to disconnect the OLED sub display when the handset is
dormant.
The ZXLB1600 is a boost converter that can provide the power requirements for OLED sub display
with the additional feature of a fully integrated isolation switch which disconnects the input from
output when the ZXLB1600 is shutdown, making it ideally suited to OLED biasing.
The schematic diagram in Figure 1 shows a full color OLED bias supply for clamshell handset sub
display.
U2
BAT54S
L1
VBATT
C1 N/C
U1
SW
VIN
LX
LBF SENSE
EN FB
N/C LBT
ADJ
GND
ZXLB1600
N/C
N/C
OUTPUT
C3
R1
C2
R2
Figure 1 Schematic diagram
Note:
For applications where OLED leakage is not an issue and the ZXLB1600 isolation switch is not
needed, the SW pin can be shorted to the VIN pin, giving a further 3% to 5% improvement in
efficiency.
Issue 4 - July 2006
© Zetex Semiconductors plc 2006
1
www.zetex.com




Zetex Semiconductors

DN66 Datasheet Preview

DN66 Datasheet

An OLED bias supply

No Preview Available !

DN66
The materials list and associated performance characteristics provide an OLED biasing solution
for the following sub display specification:
• Input voltage:
4.2V to 3.0V
• Output voltage: 12V
• Output current: 20mA (max.)
• Output ripple: 50mVpk-pk (max.)
Reference Value
Part number Manufacturer Contact details Comments
U1
ZXLB1600X10 Zetex
www.zetex.com OLED bias IC
U2
BAT54S
Zetex
www.zetex.com Dual Schottky diode
L1
22H
CMD4D11-220 Sumida
www.sumida.com 1mm height profile
R1
715k
Generic
Generic
NA
0603 size
R2
82k
Generic
Generic
NA
0603 size
C1
10F/6V3 GRM series Murata
www.murata.com 0805 size
C2(1) 10F/16V GRM series Murata www.murata.com 1206 size
C3
82pF/16V Generic
Generic
NA
0603 size
Table 1 Bill of materials
NOTES:
(1) For a lower profile, two 4.7F 0805 capacitors can be used by connecting in parallel.
www.zetex.com
2 Issue 4 - July 2006
© Zetex Semiconductors plc 2006


Part Number DN66
Description An OLED bias supply
Maker Zetex Semiconductors
Total Page 6 Pages
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