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參數(shù)資料
| 型號： | PQ60120QEB25PYS |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 300 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 621K |
| 代理商： | PQ60120QEB25PYS |
Input:
Output:
Current:
PPackage:
ackage:
35-75 V
12 V
25 A
25 A (300W)
(300W)
Quarter-brick
T
Technical S
echnical Specification
pecification
Product # PQ60120QEA25
Phone 1-888-567-9596
Doc.# 005-2QE612J Rev. A
05/05/06
Page 11
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*.
APPLICATION CONSIDERATIONS
Limited Output Voltage Resolution: The internal voltage
control feedback loop has limited resolution. Therefore, the output
voltage will exhibit discrete steps as the loop responds to changes
in line, load, trim, or remote sense. For instance, on close exam-
ination, the startup ramp has a "stair-step" shape. Likewise, a
load transient response will be composed of multiple discrete
steps. The size of each step is well determined, and is shown in
Figure C. A close-up picture of a single step is shown in Figure
D. Stepping will not occur under steady state conditions.
Current share and active trim not recommended: It is
important to note that external feedback control using the sense
or trim pins will cause sustained stepping. External current share
or active trim circuits contain a separate reference voltage. After
this external feedback has taken control, the actual output voltage
can still differ from the external reference voltage by as much as
the step size. If the external feedback loop integrates this error
voltage, it will cause a limit cycle oscillation. For this reason,
external feedback using the sense and trim pins is not recom-
mended.
Input System Instability: This condition can occur because
any DC/DC converter appears incrementally as a negative
resistance load. A detailed application note titled “Input System
Instability” is available on the SynQor website which provides
an understanding of why this instability arises, and shows the
preferred solution for correcting it.
0
20
40
60
80
100
120
140
35
40
45
50
55
60
65
70
75
Vin (V)
V
o
u
t
S
te
p
S
iz
e
(m
V
)
= 12.0 Vout
= 10.0 Vout
= 8.75 Vout
Figure C: Output voltage resolution.
Figure D: Smallest possible Vout step at 48Vin and 12Vout.
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