PQ60525HTA04 Datasheet, PDF (13/14 Pages) SynQor Worldwide Headquarters – Half-brick DC/DC Converter

Technical Specification
side ground, Vin(-).
Start Sync (pin B): The Start Synchronization pin will allow a
more consistent start-up sequence. To operate this feature, con-
nect together the Start-Sync pins of multiple current-sharing units.
This will permit immediate start-up with loads greater than the cur-
rent limit of a single unit. Without this connection, any set of con-
verters attempting to asynchronously start (or re-start) with a load
greater than the current limit of a single unit will "hiccup". This
“hiccup” mode will continue until one converter attempts a start
at the same time as the minimum number of additional units nec-
essary to sustain the load condition. For example, three 50 amp
units starting into a 90 amp load would require two units to simul-
taneously attempt a start. The Start Sync connection synchro-
nizes these starting attempts and provides a more consistent and
reliable start-up sequence. For details about the "hiccup mode"
or repeated startup attempts, please see the "Startup Inhibit
Period" note in this Technical Specification.
Clock Sync (pin A): The External Clock Synchronization pin
provides the ability for the user to control the EMI signature and
synchronize sensitive circuitry to quiet periods in the converter
operation. With this option, the converter can be synchronized to
an external clock signal whose frequency is greater than that of
the free-running internal clock. However, substantially raising the
converter’s frequency will reduce its efficiency. Therefore, the rec-
ommended frequency range for the external clock synchroniza-
tion signal applied to this pin would be the lowest value possible
without dropping below the maximum switching frequency value
listed on the Electrical Specifications page.
The following requirements should also be met:
• The external clock signal should be referenced to the
negative input voltage, Vin(-).
• The high level of the signal should be between 3.5V and
5.0V.
• The low level should be between -0.5V and +1.2V.
• Do not apply a clock signal lower than the specified fre-
quency.
Input: 35-75 V
Output: 52.5 V
Current: 3.8 A (200W)
Package: Half-brick
Product # PQ60525HTA04
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www.synqor.com
Doc.# 005-2HT652F Rev. B
03/08/04
Page 13