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PQ50050HPB50 Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters

Part No. PQ50050HPB50
Description  Output voltage trim permits custom voltages and voltage margining
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

PQ50050HPB50 Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters

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Product # PQ50050HPB50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 11
Input:
Output:
Current:
Part No.:
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.To decrease the output
voltage, the user should connect a resistor between Pin 7 and Pin
6 (SENSE(-) input). For a desired decrease of the nominal output
voltage, the value of the resistor should be
Rtrim-down =
(100%) - 2 (kW)
D
((
where
D% = Vnominal – Vdesired
x 100%
Vnominal
To increase the output voltage, the user should connect a resistor
between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase of
the nominal output voltage, the value of the resistor should be
(k
W)
Rtrim-up =
(Vnominal – 2) x VDES + VNOM
1.225
((
VDES - VNOM
Figure C graphs 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.
1
10
100
1,000
10,000
100,000
0
2
4
6
8
10
12
14
16
18
20
% increase Vout
% decrease Vout
Figure C: Trim Graph
Note: the TRIM feature does not affect the voltage at which the out-
Note: the TRIM feature does not affect the voltage at which the out-
put 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 bypassed 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.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the applica-
tion 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 (listed on the specification page) before the con-
verter 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.
Input Over-Voltage Shutdown: Available on PQ48 models
only. The converter turns off when the input voltage is too high,
allowing the converter to withstand an input voltage as high as
100V without destruction. The shutdown circuitry is a comparator
with DC hysteresis. When the input voltage exceeds the typical
Input Over-Voltage Shutdown value, the converter will turn off.
Once the converter is off, it will turn back on when the input voltage
falls below the minimum Input Over-Voltage Shutdown value.
Output Current Limit: The maximum current limit remains con-
stant as the output voltage drops. However, once the impedance
of the short across the output is small enough to make the output
voltage drop below the specified Output DC Current-Limit Shutdown
Voltage, the converter turns off.
The converter then enters a “hiccup mode” where it repeatedly turns
on and off at a 5 Hz (nominal) frequency with a 5% duty cycle until
the short circuit condition is removed. This prevents excessive heat-
ing of the converter or the load board.
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 cur-
rent 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 200 ms the converter
will automatically restart.
Over-Temperature Shutdown: A temperature sensor on the
converter senses the average temperature of the module. The ther-
mal 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.
1
10
100
1,000
10,000
0
2
4
6
8
10
12
14
16
18
20
% increase Vout
% decrease Vout


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