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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： | 6/32页 |
| 文件大小： | 1000K |
| 代理商： | LT1240-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 14 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Table 12: Characteristics of power down functions
Characteristics
Conditions
min
typ
max
Unit
ID
Output
TC min – TC max
50 1
mA
sink current
Vsat Saturation voltage ID = 50 mA
0.2
V
Vz
Zener voltage
62
Pz
Z-diode PLoss
TC = 95 °C
500
mW
1 To be limited to 50 mA by the external circuitry.
Fig. 23
Power down function (D output)
– External adjustment of threshold level Vt
– Signal electrically isolated by an external relay
Fig. 24
Remote indication of signal D by LED
Fig. 25
Remote indication of the output voltage status (output D) by
CMOS/TTL interface (e.g., for data saving)
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):
LT/UT1240:
24.6 V
±0.3 V
LT/UT1840:
49.2 V
±0.5 V
LT/UT1740:
43.9 V
±0.4 V
Fig. 22
Hysteresis of D output signal for battery chargers with
corresponding level of Power Down signal
VBat
Vfloat
Battery
recovery
Battery
low
Mains failure
Return of mains
Hysteresis
Power Down
Load switch ON
Load switch OFF
t
Vt
Z
t
high
low
Power down signal
2.05 V/cell
2.0 V/cell
06052a
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
an external relay.
Under normal operating conditions (Vo
> Vt), output D has low
impedance. If the output voltage drops below the power down
threshold level, output D becomes high impedance.
Vo+
D
Vo–
D set
Rext
06053
red LED
Vo+
D
Vo–
LED is "ON"
in case of
power down
R
06054
Vo+
D
Vo–
+5 V
CMOS, TTL
R
06055
Fig. 26
Output D signal used as inhibit to enable a system start-up in
the case of subsequently connected step-down converters
PSK/PSS/PSx with low start-up voltage. (For 48Q/CQ units,
no pull-up resistor is required.)
Vo+
D
Vo–
LT/UT
Vi+
i
Gi–
PSK/PSS/PSx
10 k
0.5 W
06056a
12
30
22
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