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參數(shù)資料
| 型號(hào)： | PQ48120QNA25NRS |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 100 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | QUARTER-BRICK PACKAGE-8 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 706K |
| 代理商： | PQ48120QNA25NRS |
Figure B graphs this relationship between Rtrim-down and .
The output voltage can be trimmed down as much as 20%.
Figure B: Trim Down Graph for 12Vout
A resistor connected between Pin 6 and Pin 7 will increase
the output voltage. For a desired increase of
percent of the
nominal output voltage, the value of this resistor should be
Figure C graphs this relationship between Rtrim-up and
.
The output voltage can be trimmed up as much as 10%.
Figure C: Trim Up Graph for 12Vout
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 tran-
sients.
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 +10%/-20%
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is
designed to turn off when the input voltage is too low, help-
ing avoid an input system instability problem, described in
more detail below. The lockout circuitry is a comparator with
dc hysteresis. When the input voltage is rising, it must
exceed a typical value of 33V before the converter will turn
on. Once the converter is on, the input voltage must fall
below a typical value of 29.5V before the converter will turn
off.
Output Current Limit: The current limit does not change
appreciably 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 approximately 60% of
its nominal value, the converter turns off.
The converter then enters a 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 pre-
vents excessive heating of the converter or the load board
(see Figure 18).
Output Over-Voltage Limit: If the voltage across the
output pins exceeds the O.V. threshold, the converter will
immediately stop switching. This prevents damage to the
load circuit due to 1) a sudden unloading of the converter,
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.
Thermal Shutdown: The
PowerQor series has a temper-
ature sensor located such that it senses the average temper-
ature of the converter. The thermal shutdown circuit is
designed to turn the converter off when the temperature at
Product # PQ48120QNA08
Phone 1-888-567-9596
Doc.# 005-2QN412D_C
9/04/01
Page 10
Technical Specification
48Vin 12Vout 8.3A
Quarter
Brick
10
100
1,000
10,000
0
2
4
6
8
10
12
14
16
18
20
% Decrease in Output Voltage
Trim
Resistance
(kOhms)
100
1,000
10,000
100,000
01
23
45
67
89
10
% Increase in Output Voltage
Trim
Resistance
(kOhms)
Rtrim-up
(k
)
where
VOUT = Nominal Output Voltage
=
(
_ 511 _ 10.22
5.11VOUT(100+%)
1.225
%
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