Product # PQ60260HTB10
Phone 1-888-567-9596
Doc.# 005-2HTB26F Rev. G
03/07/06
Page 12
Input:
Output:
Current:
PPackage:
ackage:
35-75 V
26 V
9.6 A
9.6 A (250W)
(250W)
Half-brick
T
Technical S
echnical Specification
pecification
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shut down for any reason. When an output short is present, this
generates a 5Hz "hiccup mode," which prevents the converter
from overheating. In all, there are seven ways that the converter
can be shut down, initiating a Startup Inhibit Period:
Input Under-Voltage Lockout
Input Over-Voltage Shutdown (not present in Quarter-brick)
Output Over-Voltage Protection
Over Temperature Shutdown
Current Limit
Short Circuit Protection
Turned off by the ON/OFF input
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, when the input voltage is below the UVL threshold,
the unit is disabled by the Input Under-Voltage Lockout feature.
When the input voltage rises above the UVL threshold, the Input
Under-Voltage Lockout is released, and a Startup Inhibit Period is
initiated. At the end of this delay, the ON/OFF pin is evaluated,
and since it is active, the unit turns on.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
FULL FEATURE APPLICATION NOTES
This section provides some basic application information for the
full-feature version of the PowerQor series converter. The pin-out
configuration for these optional feature pins is shown on page 2,
and the part numbering format is shown on the last page of this
specification sheet.
All units in this product family include back-drive protection to
simplify the use of multiple converters in a parallel or sequencing
application. However, any voltage applied to the output of the
converter should be kept below 120% of the rated output voltage
of the converter.
In addition to back-drive protection, these units include the fol-
lowing features (pins):
Current Share (pin 3): The active current share feature
allows for N+1 and parallel applications. To achieve load
sharing, directly connect the I share pins of multiple units. The
load current will share equally among the multiple units (±5%
at full rated current). It is important that the Vin(-) pins of the
sharing units be directly connected and NOT placed outside
of an EMI filter or other impedance path. The voltage at the
I Share pin will range from 0 to 5 volts (at full rated current),
referenced to the primary-side ground, Vin(-).
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
Figure F: Startup Inhibit Period (turn-on time not to scale)
Vout
Vin
200ms
(typical start-up
inhibit period)
t0
t1
t2
t
25ms (typical
turn on time)
ON
OFF