CMPWR280 Ver la hoja de datos (PDF) - California Micro Devices => Onsemi

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CMPWR280

1.5A SmartOR™ Dual Regulator with VAUX Drive

California Micro Devices => Onsemi 

CALIFORNIA MICRO DEVICES

CMPWR280

Typical Transient Characteristics

The transient characterization test setup shown below includes

the effective source impedance of the VCC 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 VCC selection

and deselection.

Both the rise and fall times during VCC 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 VAUX to VCC and vice versa, or from VSBY to

VCC. 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 VAUX 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.

VCC Load Transient Response is shown for a step load

from 15mA to 1500mA. An overshoot of approximately

300mV is observed, before settling within 3us.

VCC Load Transient Response

VSBY Load Transient Response is shown for a step load from

5mA to 375mA. An overshoot of approximately 100mV is

observed, before settling within 1us.

VSBY Load Transient Response

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