171050601 查看數據表（PDF） - Wurth Elektronik GmbH & Co. KG, Germany.

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171050601

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

Step 7 Optional: Synchronization to an external clock

The PWM switching frequency can be synchronized to an external frequency source through the SYNC pin (see picture

below). This feature helps avoiding undesired beat frequencies due to slight deviations of the default switching frequency in

case more modules are present in the same system. In addition, when phase shift is implemented by using two clocks

(CLK1 and CLK2), the input RMS current, and consequently input voltage ripple and input capacitance, can be reduced.

The recommended synchronization frequency range is 650kHz to 950 kHz. The typical input threshold is 1.4V transition

level. Ideally, the input clock should overdrive the threshold by a factor of 2, such as direct drive from 3.3V logic source. The

duty cycle of the synchronization signal should be in the range of 15% and 85%, as indicated in the “Electrical

Specifications” on page 5. The module is synchronized by the falling edge of the synchronization signal after a small delay

(see figure below). If this feature is not used, connect this input either directly to ground, or connect to ground through a

resistor (RSYNC, see “Typical schematic” section on page 39) of 1.5kΩ or less.

VCLK

3.3V

Trigger on the

falling edge

Synchronization signal

VSW

t

dela y

Start of the new

ON cycle

Switch node voltage

t

Note that applying a sustained “logic 1” corresponds to 0Hz PWM frequency and will cause the module to stop switching.

The figure below shows how two (in this case) or more power modules can be synchronized by a clock generator.

VIN

GND

1

VIN

7

VOUT

Modu le

2 SYNC

PGND

EP

AGND 4

VOUT1

1

VIN

7

VOUT

Modu le

2 SYNC

PGND

EP

AGND 4

VOUT2

GND

CLK1

Clock generator

CLK2

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© July 2018

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

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