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OMR186NMM Datasheet(PDF) 5 Page - International Rectifier |
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OMR186NMM Datasheet(HTML) 5 Page - International Rectifier |
5 / 8 page OMR183- OMR186 Series Stability The OMR183-186 Series requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 150µF aluminum 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 capacitance 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 aluminum cover all cases of bypassing the adjustment terminal. 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 capacitance 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 OMR183-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 terminals, 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 IADJ 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 RADIATION TEST PROGRAM The following chart is a summary of the test data collected on Radiation Tolerant OMR183-186 series at various doses. The chart depicts the Total Radiation Dose that each device was exposed to on a step stress irradiation basis prior to failure. Failure is defined as any electrical test that does not meet the limits of the device per the published data sheet specifications after radiation testing. Omnirel P/N 5K 10K 20K 30K 50K 60K 70K 80K 100K 150K 200K RAD OMR183 Test Points XX X OMR184 Test Points XX X OMR185 Test Points XXX X X X X OMR186 Test Points XXX X X X |
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