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PQ50073HZB60NNS-G Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters

Part No. PQ50073HZB60NNS-G
Description  Active back bias limit
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

PQ50073HZB60NNS-G Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters

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Input:
44-52V
Output:
7.3V
Current:
60A
Package:
Half-Brick
Product # PQ50073HZB60
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005484 Rev. B
10/25/12
Page 10
Input:
44-52V
Output:
7.3V
Current:
60A
Package:
Half-Brick
Applications Section
0.0
0.1
1.0
10.0
100.0
1,000.0
10,000.0
0
5
10
15
20
25
30
35
40
45
50
% Increase in Vout
% Decrease in Vout
Figure C: Trim Graph.
Protection Features
Input Under-Voltage Lockout: 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. The lockout circuitry is a comparator with DC
hysteresis. When the input voltage is rising, it must exceed the
typical “Turn-On Voltage Threshold” value* before the converter
will turn on. Once the converter is on, the input voltage must
fall below the typical Turn-Off Voltage Threshold value before the
converter will turn off.
Output Current Limit: If the output current exceeds the “Output
DC Current Limit Inception” point*, 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 50ms,
then the unit will enter into hiccup mode, with a 500ms 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: 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
500ms 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.
Over-Temperature Shutdown: A temperature sensor 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”
value*.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 500ms when it is
shut down due to a fault. This generates a 2 Hz “hiccup mode,”
which prevents the converter from overheating. In all, there
are three ways that the converter can be shut down, initiating a
Startup Inhibit Period:
• Output Over-Voltage Protection
• Current Limit
• Short Circuit Protection
* See Electrical Characteristics section.
To increase the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 8 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be:
Rtrim-up =
( Vnominal – 2) × Vdesired + Vnominal
1.225
Vdesired – Vnominal
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.
Rtrim-down =
( 100% 2 )
Δ%
where
Δ% =
|
Vnominal – Vdesired | × 100%
Vnominal
OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits
the user to adjust the output voltage across the sense leads up
or down according to the trim range specifications. SynQor uses
industry standard trim equations.
To decrease the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 6 (SENSE(–) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be:
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.


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