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參數(shù)資料
| 型號： | PQ60120QZB33NRS-G |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 400 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, QUARTER BRICK PACKAGE-8 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 2197K |
| 代理商： | PQ60120QZB33NRS-G |
Product # PQ60120QZB33
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005704 Rev. C
01/20/11
Page 11
Technical
Specification
PQ60120QZB33
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 convert-
er 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 examination, 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 refer-
ence 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 exter-
nal 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 recommended.
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)
Vo
ut
St
ep
Si
ze
(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.
* See Electrical Characteristics page.
Applications Section
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