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参数资料
| 型号： | LT1701-7 |
| 厂商： | Power-One |
| 文件页数： | 15/31页 |
| 文件大小： | 0K |
| 描述： | AC-DC BATTERY CHARGER 54.5V 10A |
| 标准包装： | 1 |
| 系列： | * |
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T Series Data Sheet
?
Table 13: Characteristics of System Good input and output
500 Watt AC-DC Converters
Characteristics
Conditions
min
typ
max
Unit
I Trig
Trigger level for logic
current-driven
V i min – V i max
100
μA
V Trig
I Trig
V Trig
low input (= System OK)
Trigger level for logic
high input (= System Failure)
voltage-driven
current-driven
voltage-driven
T C min – T C max
– 0.4
0
>7.5
6.2
60
V
A
V
I sys
V sat
Output sink current
Saturation voltage
1
I Sys Out = 50 mA
50
0.2
mA
V
V Z
Zener voltage protection diode
62
P Z
Power disipation Zener diode
T C = 95 °C
500
mW
1
To be limited to 50 mA by the external circuitry.
System Good Function
06057
-
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–.
Logic high if no internal
error and no inhibit
Logic AND
Ref.
+
I Sys In
Sys In
Logic high if
I Sys In > 100 mA
I Sys Out
Vo+
Sys Out
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.
Vo -
Fig. 27
Equivalent circuit of Sys In and Sys Out
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.
– i/Vcr input error such as voltage < 2.5 V (rectifier type);
control voltage out of range 5.3 V > V cr > 14 V (battery
charger), or sensor not connected, open remote control
input.
Signal input
06060
Vo+
Sys Out
No external free-
wheeling diode across
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 μA. An easy way to drive this
Vo–
relay necessary
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–.
Fig. 28
System status signal electrically isolated by an external relay
BCD20023 Rev AB, 02-Nov-2010
Page 15 of 31
www.power-one.com
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