L5987(2008) Просмотр технического описания (PDF) - STMicroelectronics

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производитель

L5987
(Rev.:2008)

3 A step-down switching regulator

STMicroelectronics 

Functional description

L5987 - L5987A

With VIN = 3.3 V, VOUT = 1.8 V, IO = 2.7 A, RDS(on) = 220 mΩ, VF = 0.35 V and DCR = 30 mΩ,

the duty is D = 73 %, so the maximum DC output current results 2.926 A, higher than the

desired current.

Figure 8.

Maximum DC output current for VQFN package vs duty cycle. For duty

cycles lower than 69 %, the RMS current does not limit the maximum DC

output current of 3 A. For duty cycles higher than the 69 % the maximum DC

output current is limited by the RMS current (see Equation 5)

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