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參數(shù)資料
| 型號(hào)： | PQ60240HZC25PRF-G |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 600 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, HALF BRICK PACKAGE-10 |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大?。?/td> | 2078K |
| 代理商： | PQ60240HZC25PRF-G |
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Product # PQ60240HZx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005987 Rev. 1
12/02/10
Page 10
Technical
Specification
PQ60240HZx25
Applications Section
OUTPUT VOLTAGE TRIM (Pin 7): TThe 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(kΩ)
Δ
where
Δ% =
| Vnominal – Vdesired | x 100%
Vnominal
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-up =
( Vnominal - 2) x VDES + VNOM
kΩ
1.225
VDES – VNOM
0.0
0.1
1.0
10.0
100.0
1,000.0
10,000.0
100,000.0
0
5
10
15
20
25
30
35
40
45
50
Tr
im
R
es
is
ta
nc
e
(k
O
hm
s)
% increase Vout
% decrease Vout
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 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.
Figure C: Trim Graph 24V Module.
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 application note titled “Input System Instability”. 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 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.
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
constant 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 2 Hz (nominal) frequency
with a small duty cycle until the short circuit condition is
removed. This prevents excessive heating 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 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
converter will automatically restart.
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.
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