PQ60050HZX60 Datasheet, PDF (11/16 Pages) SynQor Worldwide Headquarters – High efficiency, 93% at full rated load current

Applications Section
Input: 35-75V
Output: 5V
Current: 60A
Package: Half-brick
The Trim Graph in Figure C shows the relationship between the
trim resistor value and Rtrim-up and Rtrim-down, showing the total
range the output voltage can be trimmed up or down.
Note: The TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection
circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the TRIM pin.
The node is internally filtered to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout, due
to both trimming and remote load voltage drops, should not be
greater than that specified for the output voltage trim range.
10,000.0
1,000.0
100.0
10.0
1.0
0.1
0.0
0
5 10 15 20 25 30 35 40 45 50
% increase Vout
% decrease Vout
Figure C: Trim Graph
Protection Features
Input Under-Voltage Lockout (UVLO): The converter is
designed to turn off when the input voltage is too low, helping to
avoid an input system instability problem, which is described in
more detail in the application note titled “Input System Instability”
on the SynQor website. When the input is rising, it must exceed
the typical “Turn-On Voltage Threshold”* before the converter will
turn on. Once the converter is on, the input must fall below the
typical "Turn-Off Voltage Threshold"* before the converter will
turn off.
Output Current Limit (OCP): If the output current exceeds
the “Output DC Current Limit Inception” value*, then a fast linear
current limit controller will reduce the output voltage to maintain
a constant output current. If as a result, the output voltage falls
below the “Output DC Current Limit Shutdown Voltage”* for more
than 50 ms, then the unit will enter into hiccup mode, with a 500
ms off-time. The unit will then automatically attempt to restart.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the “Back-Drive Current Limit while
Enabled” specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the “Output Over-
Voltage Protection” threshold*, then the unit will shut down.
Output Over-Voltage Limit (OVP): If the voltage across
the output pins exceeds the "Output Over-Voltage Protection"
threshold*, the converter will immediately stop switching. This
prevents damage to the load circuit due to 1) excessive series
resistance in output current path from converter output pins
to sense point, 2) a release of a short-circuit condition, or 3) a
release of a current limit condition. Load capacitance determines
exactly how high the output voltage will rise in response to these
conditions. After 500 ms the converter will automatically restart
for all but the S Feature Set option, which is latching and will not
restart until input power is cycled or the ON/OFF input is toggled.
During an output over-voltage condition, the converter's LED will
illuminate. For units with latching OVP (S Feature Set), once
the over-voltage condition has been removed the LED will flash
steadily until the input power or the ON/OFF input is toggled.
Over-Temperature Shutdown (OTP): A thermister on the
converter senses the average temperature of the module. The
thermal shutdown circuit is designed to turn the converter off
when the temperature at the sensed location reaches the “Over-
Temperature Shutdown” value*. It will allow the converter to turn
on again when the temperature of the sensed location falls by the
amount of the “Over-Temperature Shutdown Restart Hysteresis”*.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 500 ms when it is
shut down due to a fault. This generates a 2 Hz “hiccup mode,”
preventing the converter from overheating. There are multiple
ways the converter can be shut down, initiating a Startup Inhibit
Period:
• Output Over-Voltage Protection
• Current Limit
• Short Circuit Protection
Product # PQ60050HZx60
Phone [phone]
* See Electrical Characteristics section.
www.synqor.com
Doc.# 005-0005974 Rev. C
12/30/13
Page 11