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參數(shù)資料
| 型號： | LT1740-7DF |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封裝： | CASE T01, MODULE |
| 文件頁數(shù)： | 10/33頁 |
| 文件大小： | 838K |
| 代理商： | LT1740-7DF |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
18/33
MELCHER
The Power Partners.
Sys Out
26
Sys In
24
Logic high if no internal
T unit error and no inhibit
ISys In
Logic high if
ISys In > 100 A
+
–
ISys Out
Vo+
12
Vo–
22
Ref.
Logic AND
06057
Fig. 33
Equivalent circuit of system good input and output
Signal input:
The system good input (Sys In) 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 the system good input is achieved by means of
an open collector transistor, or a 10 V CMOS interface.
(See figures below)
Note: If only the internal status of a T unit is to be moni-
tored, Sys In has to be connected to Vo–.
Vo+
Sys Out
Vo–
T 1000
No external free-
wheeling diode across
relay necessary
26
06060
12
22
Fig. 34
System status signal electrically isolated by an external
relay
Signal output:
The system good signal output (Sys Out) is an open collec-
tor transistor referenced to Vo–, protected by a 62 V zener
diode. The output is well suited for relay applications.
Fig. 32
Power Down used as inhibit to enable a system start-up in
case of subsequently connected step-down converters
PSK/PSR with low start-up voltage. (For CQ units no pull-
up resistor is required.)
Vo+
D
Vo–
T 1000
Vi+
i
Gi–
PSK/PSR
10 k
0.5 W
06056
12
30
22
System Good
The system good signal provides information about the
general function of the T 1000.
It can be used to monitor the status of a single T unit 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
Table 15: Characteristics of the system good input and output
Characteristics
Conditions
min
typ
max
Unit
ITrig
Trigger level for logic
current driven
Ui min...Ui max
100
A
UTrig
low input (= System OK)
voltage driven
TC min...TC max
– 0.4
6.2
V
ITrig
Trigger level for logic
current driven
0
A
UTrig
high input (= System Failure)
voltage driven
>7.5
60
V
Isys
Output sink current 1
50
mA
Usat
Saturation voltage
ISys Out = 50 mA
0.2
V
UZ
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.
connecting the output of the system good signal of one unit
to the input of the next unit. 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 "System good" is activated (low impedance) if
the following conditions are met:
No external fault
– The Sys input signal is logic low
AND
No faults monitored by the T unit such as:
– Input overvoltage
– Input undervoltage (mains failure)
– Output overvoltage
– Output short circuit
– Internal overtemperature
– Internal circuit fault
– Inhibit/Ucr remote control input error such as (inhibit)
voltage
< 2.5 V (rectifier type); control voltage out of
range 5.3 V
> U
cr
> 14 V (battery charger type) or sensor
not connected, open remote control input.
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