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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 selfilluminating. 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. L1 U2 BAT54S OUTPUT U1 VBATT VIN C3 SW LX SENSE FB ADJ R1 N/C N/C R2 C2 C1 N/C N/C LBF EN LBT GND ZXLB1600 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 (c) Zetex Semiconductors plc 2006 1 www.zetex.com DN66 The materials list and associated performance characteristics provide an OLED biasing solution for the following sub display specification: * * * * Input voltage: Output voltage: Output current: Output ripple: 4.2V to 3.0V 12V 20mA (max.) 50mVpk-pk (max.) Part number Manufacturer Contact details www.zetex.com www.zetex.com Comments OLED bias IC Dual Schottky diode Reference Value U1 U2 L1 R1 R2 C1 C2(1) ZXLB1600X10 Zetex BAT54S 22 H 715k 82k 10 F/6V3 10 F/16V 82pF/16V Zetex CMD4D11-220 Sumida Generic Generic GRM series GRM series Generic Generic Generic Murata Murata Generic Table 1 www.sumida.com 1mm height profile NA NA 0603 size 0603 size www.murata.com 0805 size www.murata.com 1206 size NA 0603 size C3 Bill of materials NOTES: (1) For a lower profile, two 4.7 F 0805 capacitors can be used by connecting in parallel. www.zetex.com 2 Issue 4 - July 2006 (c) Zetex Semiconductors plc 2006 DN66 Typical operating characteristics (For typical application circuit where VIN = 3V, VOUT = 12V, IOUT = 20mA unless otherwise stated) Figure 2 Performance graphs Issue 4 - July 2006 (c) Zetex Semiconductors plc 2006 3 www.zetex.com DN66 Typical operating waveforms (For typical application circuit where VIN = 3V, VOUT = 12V, IOUT = 20mA unless otherwise stated) Figure 3 Typical operating waveforms www.zetex.com 4 Issue 4 - July 2006 (c) Zetex Semiconductors plc 2006 DN66 Intentionally left blank Issue 4 - July 2006 (c) Zetex Semiconductors plc 2006 5 www.zetex.com DN66 Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com For international sales offices visit www.zetex.com/offices Zetex products are distributed worldwide. For details, see www.zetex.com/salesnetwork This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. www.zetex.com 6 Issue 4 - July 2006 (c) Zetex Semiconductors plc 2006 |
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