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

Example

The following application conditions are used as an example to show how to calculate a suitable COUT value:

- VIN = 12V

- VOUT = 3.3V

- load transient from 1A to 5A and vice versa (∆IOUT = 4A)

- max allowed undershoot or overshoot ∆VOUT = 100mV

COUT can be calculated using equation (12) on page 23. This equation provides two possible values depending on whether td

is calculated for a positive load transient (generating a VOUT drop) or for a negative load transient (resulting in a VOUT

overshoot).

A combination of two 22µF MLCC (Würth Elektronik, part number 885012108018) together with a 220µF aluminum polymer

capacitor (Würth Elektronik, part number 875115350002) are selected. Some margin from the calculated COUT value is

recommended in order to take into account:

- Approximations within the equations to estimate td and COUT itself;

- Tolerances and variations of some components and parameters involved in those equations (e.g. RON, tOFF-MIN, L, k,

etc.)

- Derating of the capacitors with DC applied voltage and temperature

The use of two MLCCs in parallel contributes to the further reduction of the total ESR. The selected combination of output

capacitors allows for stable operation and provides a phase margin around 65°.

The load transients with the selected COUT can be tested using the setup depicted below. The resistor RLOAD1 sets the lower

current value of the transient (IOUT1). In order to reach the higher current value (IOUT2) the resistor RLOAD2 is switched through

a N-Channel MOSFET. A square waveform applied to the gate of this MOSFET generates continuously load transients

between IOUT1 and IOUT2 and conversely.

VIN

VI N

VO UT

MagI³C Power

Modu le

GND

COUT

RLOAD1

3.3Ω

RLOAD2

0.82Ω

IOUT1 IOUT1-IOUT2

Q1

GND

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© July 2018

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

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