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参数资料
| 型号： | LT1740-7Z |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 8/32页 |
| 文件大小： | 1000K |
| 代理商： | LT1740-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 16 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Series and Parallel Connection of Power Down and
System Good
To achieve a logic-OR function of the signals Sys Out and D,
connect the D output to Sys In. The desired function is then
obtained from the Sys Out output. The output signal becomes
high, if the output voltage is lower than the threshold of the
power down circuit, inhibit is applied, or an internal error has
occurred.
Fig. 29
Sys out and D connected in series. The output signal will
indicate an error at start-up.
Fig. 30
Wired AND of isolated open collector signals (e.g. the OUT OK signal of 48/CQ units) with the Sys Out
signals of T units in series to achieve one signal about the status of the whole system
To achieve a logic AND function of the Sys Out and D, connect
the D output with the Sys Out. This combination generates an
output signal only in the case of severe system errors. Only a T
system fault together with a simultaneous power down of the
output voltage will cause this output signal to become high
impedance.
Fig. 31
Sys out and D connected in parallel.
Vo+
Sys Out
Vo–
Sys In
Vo–
Vo+
Sys Out
Vo–
Overall
System
Good
Out OK
circuit
1 k
20 V
Out OK
circuit
1 k
20 V
Out OK
circuit
1 k
20 V
06059a
48Q/CQ
no. 1
48Q/CQ
no. 2
48Q/CQ
no. x
Sys In
LT/UT
24
22
26
12
22
12
Internal
signals
Vo–
Sys In
Sys Out
Vo+
i/Vcr
D
D set
Vo+
R
06061a
LT/UT
Internal
signals
Vo–
Sys In
Sys Out
Vo+
i/Vcr
D
D set
Vo+
R
06062a
LT/UT
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