BQ4H480FTX64 Datasheet, PDF (13/14 Pages) –

Applications Section
Input: 230-400 V
Output: 48 V
Current: 64 A
Package: Full-brick
Current Sharing: MCOTS BusQor modules are designed to
operate in parallel without the use of any external current share
circuitry. Current sharing is achieved through “Droop Share”. An
output capacitor is recommended across each module and located
close to the converter for optimum filtering and noise control
performance. Dedicated input inductors are recommended but are
considered optional. Input capacitors must be located close to the
converter module. PCB layout in the input circuit should be such
that high frequency ripple currents of each module is restricted
to a loop formed by the input capacitors and the input terminals
of the BusQor module. See Figure H for details on PCB layout.
Contact SynQor application engineering for further assistance on
PCB trace design.
The current share performance of two paralleled modules is
illustrated in the graph in Figure I. In this graph the percent
deviation from ideal sharing (50%) is plotted for each module
versus the total output load current at 270 Vin. Two MCOTS 270
Bus Qor’s will share within 10% at higher loads. The current share
accuracy is affected by changes in the gate drive timing. The gate
drive timing is adjusted as a function of load to better optimize the
product efficiency over line and load (performance), resulting in
higher load share deviations at lighter loads.
20.0%
15.0%
10.0%
5.0%
0.0%
-5.0%
-10.0%
-15.0%
Module 1
Module 2
-20.0%
10 20 30 40 50 60 70 80 90 100 110 120 130
Total Load Current (A)
Figure I: Typical current share performance of 2 paralleled modules
270 Vin
CM EMI
filter
Bulk
Cap
BusQor module
BusQor module
Input LC filters
Figure H: Recommended physical implementation of two Bus Qor's in parallel.
Product # BQ4H480FTx64
Phone [phone]
www.synqor.com
Doc.#005-0006678 Rev. 5
07/18/16
Page 13