WPMDH1302401 Просмотр технического описания (PDF) - Wurth Elektronik GmbH & Co. KG, Germany.

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производитель

WPMDH1302401

MagI³C Power Module VDRM - Variable Step Down Regulator Module

Wurth Elektronik GmbH & Co. KG, Germany. 

WPMDH1302401 / 171032401

MagI³C Power Module

VDRM - Variable Step Down Regulator Module

BLOCK DIAGRAM

Linear

Regulator

CVCC

Power Module

CBOOST

VIN

CIN

1 VIN

RON

0.47µF

HSS

2 RON

VIN

UVLO

5 SS

Controller/

Power Control/

Protection Circuitry

10µH

VOUT 7

LSS

6 FB

CSS

AGND

EN AGND

3

4

PGND

EP

RFBT

CFF

RFBB

AGND

VOUT

COUT

CIRCUIT DESCRIPTION

The MagI³C Power Module WPMDH1302401 is based on a synchronous step down regulator with integrated

MOSFET and a power inductor. The control scheme uses a constant on-time (COT) low ripple hysteretic

regulation loop.

The VOUT of the regulator is divided with the feedback resistor network RFBT and RFBB and fed into the FB pin. The

internal comparator compares this signal with the internal 0.8V reference. If the feedback voltage is below the

reference, the High Side MOSFET is turned on for a fixed on-time.

To achieve a regulated output voltage the off-time is modulated. At stable VIN to VOUT condition the relation

between on-time and off-time is constant. The on-time is fixed and preset by the value of the RON resistor. The

switching frequency is directly proportional to this value.

The connection of the RON resistor to VIN results into an additional compensation of varying VIN values, (VIN feed-

forward) so the switching frequency will remain almost constant even during VIN transients.

A load current transient (low to high current) allows the off-time to immediately transition to the minimum of 260

ns. This results in a short term higher switching frequency which ensures an extremely quick regulation response.

As soon as the output capacitor is recharged to the nominal output voltage the switching frequency will return to

the original value even though the load current is higher.

Constant on-time control scheme does not require compensation circuitry which makes the overall design very

simple. Nevertheless it requires a certain minimum ripple at the feedback pin.

The MagI³C Power Module WPMDH1302401 generates this ripple internally and is supported by the CFF

capacitor which bypasses AC ripple directly to the feedback pin from the output. With this architecture very small

output ripple values of 10ths of millivolts similar to current or voltage mode devices are achieved.

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Würth Elektronik eiSos GmbH & Co. KG - Data Sheet - REV 1.0

10/31

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