171020601 查看數據表（PDF） - Wurth Elektronik GmbH & Co. KG, Germany.

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171020601

MagI3C Power Module VDRM – Variable Step Down Regulator Module

Wurth Elektronik GmbH & Co. KG, Germany. 

WPMDM1500602 / 171050601

MagI3C Power Module

VDRM – Variable Step Down Regulator Module

LIGHT LOAD OPERATION

Under light load operation, the device switches from Continuous Conduction Mode (CCM) to Discontinuous Conduction

Mode (DCM). The load current where the transition between DCM and CCM takes place can be estimated using the

following formula and illustrated by the diagram below:

IOUT(DCM) =

VOUT∙

(1-

VOUT

VIN

2∙fSW∙L

)

(19)

Output current transition point between DCM and CCM vs output voltage

1,0

0,9

0,8

VIN = 24V

0,7

0,6

VIN = 12V

0,5

0,4

0,3

0,2

0,1

0,0

0,8 1,2 1,6 2,0 2,4 2,8 3,2 3,6 4,0 4,4 4,8 5,2 5,6 6,0

VOUT [V]

In CCM, current flows through the inductor over the entire switching cycle and never falls to zero during the OFF-time (see

figure below, black curve). Once the inductor current reaches zero during the OFF-time, the module starts to operate in DCM

(see figure below, red curve). The output voltage ripple during this mode is typically higher than in CCM. In case of no load

or load of few milliamps some switching cycle might be skipped.

3,0

2,5

2,0

1,5

1,0

0,5

0,0

-0,5

0

Inductor Current Ripple in DCM and CCM operation VIN = 12V, VOUT = 3.3V

CCM operation (IOUT= 2A)

DCM operation (IOUT= 200mA)

1

2

3

4

5

6

7

8

9

10 11 12

Time [µs]

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© July 2018

Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 2.0

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