zxlb1600 Zetex Semiconductors plc., zxlb1600 Datasheet
zxlb1600
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zxlb1600 Summary of contents
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... LCD AND OLED BIAS BOOST CONVERTER - STN, CSTN SCREENS DESCRIPTION The ZXLB1600 inductive switching boost converter accepts an input voltage of between 1.6V and 5.5V and provides an adjustable output voltage 28V for LCD and OLED bias. The device contains an output switch and a second switch to isolate the coil from the input to provide true isolation in shutdown mode ...
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... ZXLB1600 ABSOLUTE MAXIMUM RATINGS (Voltages to GND unless otherwise stated) Output voltage Input voltage Switch output current Power dissipation Operating temperature Storage temperature Junction temperature ELECTRICAL CHARACTERISTICS Test conditions unless otherwise stated: V Symbol Parameter General (1) V Input voltage IN I Supply current Shutdown ...
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... (6) V switched from high to low EN V falling IN BLT V rising IN Output ‘on’ 0.5mA BLOL Output ‘off’ 29V BLOH Output ‘off’ 3 ZXLB1600 Min Typ Max Units 1. ppm ADJ (NOM) - 100 % IN 4 kHz 52 ...
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... Low battery flag output: open drain (active low for low battery voltage) Active when EN is high or low Ground Voltage feedback pin for output (threshold 1.23V) Low battery flag threshold adjust input (threshold 1.21V) TEMPERATURE 4 PART MARK RANGE ZXLB1600 ZXLB1600 ISSUE 3 - SEPTEMBER 2003 ...
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... This maintains stable and efficient operation. ISSUE 3 - SEPTEMBER 2003 ZXLB1600 Setting output voltage With external voltage The output voltage is equal to the voltage present on the 'ADJ' pin of the device multiplied by the internal resistor network factor (R1+R2)/R1 ...
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... D x 28V Gated PWM operation The internal circuitry of the ZXLB1600 is turned off when no signal is present on the 'EN' pin for more than 120 s (nominal). A low frequency signal applied to the EN pin will therefore gate the device 'on' and 'off' at the ...
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... Bottom: Enable input (1V/div), Top: Output voltage (10V/div) Plot 4 Operating waveforms at max output voltage 10mA load Bottom: LX Output (10V/div), Top: Output voltage (50mV/div ac) Plot 6 Load rejection Bottom: Load current (1mA/div), Top: Output voltage (0.1V/div ac) 7 ZXLB1600 ...
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... ZXLB1600 TYPICAL OPERATING CHARACTERISTICS (Continued and ISSUE 3 - SEPTEMBER 2003 ...
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... TYPICAL OPERATING CHARACTERISTICS (Continued) ISSUE 3 - SEPTEMBER 2003 and ZXLB1600 ...
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... ZXLB1600 TYPICAL OPERATING CHARACTERISTICS (Continued and ISSUE 3 - SEPTEMBER 2003 ...
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... APPLICATION NOTES Adjusting output voltage When connected as shown in the typical application circuit, the ZXLB1600 will produce a nominal output voltage of 28V. This can be adjusted by one of the three methods described below. 1) Output voltage adjustment by external resistors The internal reference and resistor divider network R1 and R2 set a nominal output of 28V ...
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... PWM signal is applied. Negative output The ZXLB1600 can be used to provide a negative output voltage (in addition to the normal positive output) as shown in the application circuit below. In this circuit, the external resistors are used to set the output voltage to 22V as described in the previous section ...
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... Small schottky diodes such as the BAT54 are suitable for use with the ZXLB1600 and this diode will give good all round performance over the output voltage and current range. At lower output voltages, a ...
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... ZXLB1600 Increased efficiency If isolation of the coil from the supply is not needed, the high side of this can be connected directly to VIN to improve efficiency. This prevents power loss in the internal PMOS switch and typical efficiency gains of 5% can be achieved. (See efficiency vs. load curves). Some ...
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... Notes: ISSUE 3 - SEPTEMBER 2003 15 ZXLB1600 ...
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... ZXLB1600 PACKAGE OUTLINE Controlling dimensions are in millimeters. Approximate conversions are given in inches © Zetex plc 2003 Europe Zetex plc Zetex GmbH Fields New Road Streitfeldstraße 19 Chadderton D-81673 München Oldham, OL9 8NP United Kingdom Germany Telephone (44) 161 622 4444 Telefon: (49 ...