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OM186SR Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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OM186SR Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 5 page 3.3 205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246 OM183SC - OM186ST - OM186SR .707 .697 .750 .500 .835 .815 .695 .685 .165 .155 .200 TYP. .550 .530 .270 .240 .045 .035 .140 TYP. .092 MAX. .065 .055 .005 Pin 1 - Adjust Pin 2 - VOUT Pin 3 - VIN 12 3 Pin 1 - Adjust Pin 2 - VOUT Pin 3 - VIN 12 3 MECHANICAL SPECIFICATIONS P/N OM183SC and OM184SC JEDEC TO-258AA .430 .410 .200 .190 .038 MAX. .005 .120 TYP. .537 .527 .665 .645 .420 .410 .150 .140 .750 .500 .100 TYP. .035 .025 .045 .035 P/N OM185ST and OM186ST JEDEC TO-257AA Stability The OM183-186 Series requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 150µF alu- minum electrolytic or a 22µF solid tantalum on the output will ensure stability. Normally, capacitors much smaller than this can be used. Many different types of capacitors with widely varying characteristics are available. These capacitors differ in capacitor tolerance (sometimes ranging up to ±100%), equivalent series resistance, and capaci- tance temperature coefficient. The 150µF or 22µF values given will ensure stability. When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. The values of 22µF tantalum or 150µF alu- minum cover all cases of bypassing the adjustment termi- nal. Without bypassing the adjustment terminal, smaller capacitors can be used with equally good results and the table below shows approximately what size capacitors are needed to ensure stability. Recommended Capacitor Values Normally, capacitor values on the order of 100µF are used in the output of many regulators to ensure good transient response with heavy load current changes. Output capac- itance can be increased without limit and larger values of output capacitor further improve stability and transient response of the OM183SC regulators. Output Voltage — Adjustable Regulators The OM183-OM186 devices develop a 1.25V reference voltage between the output and the adjust terminal (see below). By placing a resistor, R1, between these two ter- minals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is the specified minimum load current of 10mA. Because I ADJ is very small and constant when compared with the current through R1, it represents a small error and can usually be ignored. Basic Adjustable Regulator APPLICATION NOTES Input Output Adjustment 10µF 10µF Tantalum, 50µF Aluminum None 10µF 22µF Tantalum, 150µF Aluminum 20µF V IN V OUT IN OUT OM183SC ADJ I ADJ 50 µA V REF V OUT = VREF (1+ ) +I ADJ R2 R2 R1 R2 R1 |
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