iq32050hpc32nrs SynQor Worldwide Headquarters, iq32050hpc32nrs Datasheet - Page 11

• Manufacturer Part Number: iq32050hpc32nrs
• Description: Half-brick Dc-dc Converter
• Manufacturer: SynQor Worldwide Headquarters

Product # IQ32xxxHPCxx
Before time t
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 t
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Thermal Considerations: The maximum operating base-
plate temperature, T
system keeps T
rated power.
A power derating curve can be calculated for any heatsink that is
attached to the base-plate of the converter. It is only necessary
to determine the thermal resistance, R
between the base-plate and the ambient air for a given airflow
rate. This information is usually available from the heatsink
vendor. The following formula can the be used to determine the
Under-Voltage
Lockout Turn-
On Threshold
ON/OFF
(neg logic)
1
, the unit is disabled by the ON/OFF pin, and it cannot
V out
V in
0
, when the input voltage is below the UVL threshold,
B
ON
< 100 ºC, the converter can deliver its full
B
t
0
, is 100 ºC. As long as the user’s thermal
(typical start-up
inhibit period)
200ms
Phone [phone]
Figure F: Startup Inhibit Period (turn-on time not to scale)
TH BA
, of the chosen heatsink
2
, the Startup Inhibit
t
1
www.synqor.com
OFF
200ms
ON
maximum power the converter can dissipate for a given thermal
condition if its base-plate is to be no higher than 100 ºC.
This value of power dissipation can then be used in conjunction
with the data shown in Figure 2 to determine the maximum load
current (and power) that the converter can deliver in the given
thermal condition.
For convenience, Figures 3 and 4 provide Power derating curves
for an encased converter without a heatsink and with a typical
1/4" high heatsink.
t
2
OFF
Doc.# 005-005H332 Rev. 1
200ms
P
diss
max
R
=
ON
100 ºC - T
IQ32-HPC Family
TH BA
9ms
turn on time)
Specification
(typical
A
08/13/08
Technical
t
Page 11