參數(shù)資料
型號(hào)： LT1740-7Z
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 21/32頁(yè)
文件大?。?/td> 1000K
代理商： LT1740-7Z
BCD20023 Rev. AA, 3-Sep-2008
Page 28 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Table 21: Leakage currents
Characteristic
LT/UT
Unit
Earth leakage
Permissible according to IEC/EN 60950
3.5
mA
current
Specified value at 255 V, 50 Hz (LT)
1.8 1
Specified value at 127 V, 60 Hz (LT or UT)
1.1 1
Output leakage
Permissible according to IEC/EN 60950
0.25
current
Specified value at 255 V, 50 Hz (LT)
<0.1
Specified value at 127 V, 60 Hz (LT or UT)
<0.1
1
In phase to phase configuration, the leakage current is lower.
Fig. 50
Schematic safety concept
AC-DC
converter
Mains
SELV
Earth
connection
+
–
~
10021a
Fuse
Output
Safety of Operator-Accessible Output Circuits
If the output circuit of a converter is operator-accessible, it
shall be an SELV according to the safety standard IEC/EN
60950.
The following table shows a possible installation configuration,
compliance with which causes the output circuit to be an SELV
circuit up to a configured output voltage (sum of nominal
voltages if in series or +/– configuration) of 56.5 V.
However, it is the sole responsibility of the installer to assure
the compliance with the relevant and applicable safety
regulations.
Table 22: Safety concept leading to an SELV circuit
Conditions
AC-DC converter
Installation
Result
Supply voltage
Grade of isolation between input and
Measures to achieve the resulting
Safety status of the AC-DC
output, provided by the AC-DC
safety status of the output circuit
converter ouput circuit
converter
Mains
≤250 VAC
Double or reinforced
Installation according to the applicable
SELV circuit
standards
Description of Options
D Undervoltage Monitor
This option is designed for systems using backplanes or is
intended for use in applications, where a fuse or a decoupling
diode is fitted into the positive supply line to the system bus.
The status of the system bus/battery voltage can be monitored
rather than the output status of a single T unit. Input D set (pin
32) is not internally connected to Vo+ (Rint is missing; see fig.
20).
To maintain the adjustment capabilities and resistor values for
setting the different threshold values, a 43.2 k
(21.5 k)
resistor should be fitted into the sense line to the bus. If D set
(pin 32) is left open, output D (pin 30) is permanently signaling
low bus voltage.
For details see also Auxiliary functions, Power Down.
F Externally Accessible Fuse
The standard T converters have a non-accessible fuse, 5
× 20
mm. Some applications require an externally accessible fuse.
Option F provides a fuse mounted on the rear side; see
Mechanical Data.
B1 Cooling Plate
If a cooling surface is available, the converters can be provided
with a mounting plate (option B1) instead of the standard heat
sink on the right-hand side; see Mechanical Data.
Since approximately 50% of the losses have to be dissipated
through the remaining heat sink on the left-hand side, sufficient
free air flow must still be provided.
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