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参数资料
| 型号： | LT1701-7 |
| 厂商： | Power-One |
| 文件页数： | 14/31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
?
Upper threshold level
The upper threshold level of the power down function is given.
The rectifier models have a relatively small hysteresis of 1 V to
prevent the signal from oscillation.
The battery chargers have a larger hysteresis. The upper level
is set at 2.05 V/cell.
To avoid deep discharge of the battery, the load should be
disconnected from the battery at the low level of the power
down signal. The battery voltage will then recover slowly up to
its chemical equilibrium, about 2 V/cell. The load may not be
connected again to the battery, until the T converter is
operating and charging it. Then the output voltage will be
higher than 2.05 V/cell.
High level of output signal D (pin 30):
500 Watt AC-DC Converters
06053
Vo+
D
Vo–
R ext
D set
Fig. 23
Power down function (D output)
– External adjustment of threshold level V t
– Signal electrically isolated by an external relay
06054
LT/UT1240:
LT/UT1840:
LT/UT1740:
24.6 V
49.2 V
43.9 V
±0.3 V
±0.5 V
±0.4 V
Vo+
D
R
red LED
V float
V Bat
Battery
06052a
Vo–
LED is "ON"
in case of
power down
2.05 V/cell
2.0 V/cell
recovery
Load switch ON
Hysteresis
Fig. 24
Remote indication of signal D by LED
Power Down
V t
Battery
low
Load switch OFF
t
06055
Vo+
+5 V
high
low
Z
Mains failure
Return of mains
Power down signal
t
D
Vo–
R
CMOS, TTL
Fig. 22
Hysteresis of D output signal for battery chargers with
corresponding level of Power Down signal
Fig. 25
Remote indication of the output voltage status (output D) by
CMOS/TTL interface (e.g., for data saving)
Signal output characteristics
Output D (pin 30) is an open-collector signal, referenced to
Vo–, protected by a 62 V Zener diode; it is well suited to drive
06056a
an external relay.
Under normal operating conditions ( V o > V t ), output D has low
impedance. If the output voltage drops below the power down
threshold level, output D becomes high impedance.
Table 12: Characteristics of power down functions
LT/UT
Vo+ 12
D 30
Vo– 22
10 k ?
0.5 W
Vi+
PSK/PSS/PSx
i
Gi–
Characteristics
Conditions
min
typ max
Unit
I D
Output
T C min – T C max
50 1
mA
sink current
V sat Saturation voltage I D = 50 mA
V z Zener voltage
62
0.2
V
Fig. 26
Output D signal used as inhibit to enable a system start-up in
the case of subsequently connected step-down converters
P z
Z-diode P Loss
T C = 95 °C
500
mW
PSK/PSS/PSx with low start-up voltage. (For 48Q/CQ units,
1
To be limited to 50 mA by the external circuitry.
no pull-up resistor is required.)
BCD20023 Rev AB, 02-Nov-2010
Page 14 of 31
www.power-one.com
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