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参数资料
| 型号： | LT1240-7Z |
| 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： | 7/32页 |
| 文件大小： | 1000K |
| 代理商： | LT1240-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 15 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Table 13: Characteristics of System Good input and output
Characteristics
Conditions
min
typ
max
Unit
ITrig
Trigger level for logic
current-driven
Vi min – Vi max
100
A
VTrig
low input (= System OK)
voltage-driven
TC min – TC max
– 0.4
6.2
V
ITrig
Trigger level for logic
current-driven
0
A
VTrig
high input (= System Failure)
voltage-driven
>7.5
60
V
I sys
Output sink current 1
50
mA
Vsat
Saturation voltage
ISys Out = 50 mA
0.2
V
VZ
Zener voltage protection diode
62
PZ
Power disipation Zener diode
TC = 95 °C
500
mW
1
To be limited to 50 mA by the external circuitry.
Fig. 28
System status signal electrically isolated by an external relay
System Good Function
The Sys Out signal (pin 26) provides information about the
general function of the converter. It can be used to monitor the
status of a single T Series converter, or can be linked with other
signals within a power system to drive one single-logic signal
for the status of the whole system by connecting the output Sys
Out of one converter to the input Sys In (pin 24) of the next one.
Low voltage (impedance) of the input and output has the
meaning of "system good". The first input of the system has to
be connected to Vo–.
The signal Sys Out is activated (low impedance), if the
following conditions are met:
No external fault
– the Sys In signal (pin 24) is logic low,
AND:
No faults monitored by the T Series converter, such as:
– Input overvoltage
– Input undervoltage (mains failure)
– Output overvoltage
– Output short circuit
– Internal overtemperature
– Internal circuit fault.
– i/Vcr input error such as voltage
< 2.5 V (rectifier type);
control voltage out of range 5.3 V
> Vcr > 14 V (battery
charger), or sensor not connected, open remote control
input.
Signal input
The input Sys In (pin 24) can be voltage- or current- driven. To
trigger the internal comparator, the voltage at the Sys In pin
has to be
<6.2 V, if voltage-driven. If current-driven, the sink
current to Vo– has to be
>100 A. An easy way to drive this
input is achieved by means of an open collector transistor, or a
10 V CMOS interface.
Note:If only the internal status of a T Series converter should be
monitored, Sys In has to be connected to Vo–.
Vo+
Sys Out
Vo–
No external free-
wheeling diode across
relay necessary
06060
Signal output
The signal Sys Out (pin 26) has the meaning of “system good”.
It is built by an open collector transistor referenced to Vo–,
protected by a 62 V Zener diode.
Fig. 27
Equivalent circuit of Sys In and Sys Out
Sys Out
Sys In
Logic high if no internal
error and no inhibit
ISys In
Logic high if
ISys In > 100 mA
+
-
ISys Out
Vo+
Vo
-
Ref.
Logic AND
06057
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