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CMPWR280TO Datasheet(PDF) 6 Page - California Micro Devices Corp |
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CMPWR280TO Datasheet(HTML) 6 Page - California Micro Devices Corp |
6 / 10 page CALIFORNIA MICRO DEVICES ©2000 California Micro Devices Corp. All rights reserved. 3/00 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com CMPWR280 6 The transient characterization test setup shown below includes the effective source impedance of the V CC supply (RS). This was measured to be approximately 0.1Ω. It is recommended that this effective source impedance be no greater than 0.15Ω to ensure precise switching is maintained during V CC selection and deselection. Both the rise and fall times during V CC power-up/down sequencing were controlled to be around 10 milliseconds duration. This is considered to represent worst case conditions for most application circuits. During a selection or deselection transition the DC load current is switching from V AUX to VCC and vice versa, or from VSBY to V CC. In addition to the normal load current there may also be an in-rush current for charging/discharging the load capacitor. The total current pulse being applied to either V AUX or VCC is equal to the sum of the dc load and the corresponding in- rush current. Transient currents in excess of one amp can readily occur for brief intervals when either supply commences to power the load. V CC Load Transient Response is shown for a step load from 15mA to 1500mA. An overshoot of approximately 300mV is observed, before settling within 3us. Typical Transient Characteristics V CC Load Transient Response V SBY Load Transient Response is shown for a step load from 5mA to 375mA. An overshoot of approximately 100mV is observed, before settling within 1us. V SBY Load Transient Response |
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