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IRUH50P333B1M Datasheet(PDF) 5 Page - International Rectifier |
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IRUH50P333B1M Datasheet(HTML) 5 Page - International Rectifier |
5 / 7 page www.irf.com 5 IRUH50P333B1M Recommended input capacitance for a generic application is a 100 µF, 16V tantalum capacitor. However, the input capacitance is not critical to the stability of the regulator and is therefore application dependant. In designs with a clean bus voltage that is situated close to the input of the regulator, only a small ceramic capacitor will be needed to decouple high frequency noise. On the other hand , in designs with a noisy bus, a larger capacitor will be needed. Care should be taken to ensure that the input to the regulator is sufficiently free of noise and disturbances. Output Capacitance Like most ultra low dropout voltage regulators, IRUH50P333B1M requires the use of output capacitors as part of the device frequency compensation. The device requires a minimum of 220 µF tantalum to ensure stability. Many different types of capacitor are available and have widely varying characteristics. These capacitors differ in capacitor tolerance, equivalent series resistance (ESR), equivalent series inductance and capacitance temperature coefficient. The IRUH50P333B1M frequency compensation optimizes frequency response with low ESR capacitors. In general, use capacitors with an ESR of less than 50m Ω for heavy load applications. High quality bypass capacitors must be also be used to limit the high frequency noise generated by the load. Multiple small ceramic capacitors are typically required to limit parasitic inductance (ESL) and ESR in the capacitors to acceptable levels. The upper limit of the capacitance is governed by the delayed over-current latch function of the regulator. The regulator has a protection circuit that will latch the device off in the event of a short circuit. However, since it is known that the regulator will draw a large in-rush current upon startup, the latch-off is delayed by about 10ms to allow the outout capacitors to charge to a steady state without shutting down. During this period, the regulator will have an output current at its maximum of around 5A typical. Therefore, the maximum output capacitance can be as high as 20,000 µF without causing device to latch-off during start-up. Input Capacitance Fig 2. Typical Application Circuit IRUH50P333B1M Vout Vin SHDN GND 100uF 16V Tantalum 1.0uFx10 Ceramic X 7R 1000uF 6.3V Low ESR Tantalum Vin Vout Ground |
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