Info!! Synchronizing The I6a Dc-Dc Converter Switching Frequencies

When multiple DC to DC converters are used to mightiness sensitive circuitry, input as well as output vibrations tin effort organisation issues, especially when mensuration real depression indicate voltages.  The work is compounded if the converters’ switching frequencies vary alongside input voltage or output load. 

Even when the converter’s operating frequency is fixed, in that place volition hold upward a tolerance on the switching frequency timing circuit betwixt the converters as well as but a few Hertz differences betwixt the converters tin effort sub-harmonic vanquish frequencies.

Filtering the inputs as well as outputs is 1 solution, but this tin hold upward complex over a broad frequency bandwidth.  If the DC-DC converters had a fixed switching frequency as well as could hold upward synchronized to together or tied to a main clock, whatever board and/or organisation EMI filtering would hold upward simpler.

Although somewhat uncommon, in that place are about DC-DC converters that accept synchronization capability.  When the “full feature” selection is specified on TDK-Lambda’s depression cost, fixed frequency, i6A serial of 250W non-isolated DC-DC converters, multiple units tin accept their operating frequency synchronized.

There are iv ways to connect the modules:

1. Master / Slave, alongside no stage shift.  One i6A module is the “master” as well as the other modules volition function at the master’s switching frequency.  All the modules depict input electrical current at the same time.

 

2. Master / Slave, alongside 180 score stage shift.  One i6A module is the “master” as well as other modules volition function at the master’s switching frequency, but straight out of phase.  This tin trim back the peak input ripple electrical current from the supply, requiring less input capacitance.  Any module alongside a jumper betwixt pins 4 as well as 33 volition accept the stage shift business office activated.

 

3. An external clock is used alongside no stage shift.  All the i6A modules function at the same frequency every bit the external clock (no main / slave). All the modules depict input electrical current at the same time.

 

4. An external clock is used alongside a 180 degrees stage shift.  All the i6A modules function at the same frequency every bit the external clock (no main / slave), but whatever module alongside a jumper betwixt pins 4 as well as 33 volition accept the stage shift business office activated.  This 1 time again reduces the peak input ripple electrical current from the supply, requiring less input capacitance.

 

The i6A non-isolated DC-DC converters are a serial of measure downward converters (the input voltage has to hold upward higher than the output) inward the manufacture criterion 1/16^th brick footprint.  All models characteristic broad hit input voltages, every bit high every bit ix to 53V as well as accept broad hit output adjustment from 3.3 – 15V to 3.3 – 40V.  Operating efficiencies tin hold upward every bit high every bit 98%.

See http://www.us.tdk-lambda.com/lp/products/i6a-series.htm for farther information.