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参数资料
| 型号： | LWN2880-6ERD5M2FK2G |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-5 |
| 文件页数： | 15/25页 |
| 文件大小： | 758K |
| 代理商： | LWN2880-6ERD5M2FK2G |
BCD20020-G Rev AB1, 17-Nov-09
Page 22 of 25
www.power-one.com
W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
D1: Output Voltage Monitor
D1 is intended for monitoring the bus voltage of a battery-
buffered system. It indicates that the system is powered from
the battery and can for instance be used as a warning signal or
to switch off a part of the load. When the output voltage Vo (or
Vo2) is greater than Vo low D1 specified in table 17, the D1 signal
output is conducting: VD1 < 1.5 V, ID1 max < 50 mA.
When Vo is lower, the D1 signal output is high impedance
(open-collector, max. 58.6 V). In double-output models, D1
monitors only output 2 (Vo2).
In applications without battery-buffering the D1 signal may not
be suitable, since smaller dynamic load changes may cause
D1 to trigger. For such applications, D5 with a trigger level of
approx. 85% of Vo nom should be chosen (e.g., for a bus voltage
of 24.7 V: trigger level at 21 V).
D5: System Voltage Monitor (Battery Deep)
D5 monitors the output voltage Vo (Vo2 in double-output
models) or the lowest admissible voltage of a connected
battery (battery deep discharge). The definition of D5 is similar
to D1, but the trigger level is lower. When Vo (or Vo2) is greater
than Vo low D5 specified in table 17, the D2 signal output is
conducting:
VD5 < 1.5 V, ID5 max < 50 mA.
When Vo is lower, the D5 signal output is high impedance
(open-collector, max. 58.6 V). In double-output models, D5
monitors only output 2 (Vo2).
In systems without battery support, D5 signals that Vo (or Vo2 )
is going to drop below a safe value.
In battery-buffered systems, D5 indicates that the battery has
reached its deepest discharge level prior to getting damaged.
The D5 signal can be used for instance to disable loads, save
data, or to start a controlled switch-off of running processes.
Adjustment of Threshold Levels (D1/D5)
Pin 7 of the D-SUB connector allows for adjustment of the
threshold levels of D1 and D5. Both levels are influenced by
the voltage divider Rx / Ry. Resistor Rx to pin 3 (VCC) lowers
the levels, whereas Ry to pin 1 (GND1) increases them (see
fig. 22).
SD: Shutdown
Reduces the output power to approx. 1 W, but the converter is
not fully disabled. In a no-load condition, Vo drops below 6.2 V;
see fig. 23. In double-output models, only output 2 is
influenced.
Table 18: Shutdown conditions
Voltage VSD on
Result
shutdown pin
< 0.7 V
Converter disabled (Po approx. 1 W)
≥2.0 V or open
Converter enabled
Sys-OK: Status
This function allows in a battery charger application for
checking, whether the output is correctly following the external
control signal at the R-input (coming for instance from the
temperature sensor). The logic is shown in table 19.
Fig. 23
Output voltage versus output current, while the shutdown is
activated (Vi = Vi nom).
05175b
3
1
0
0.2
0.4
0.6
0.8
1.2
1
A
5
Output current
V
Output voltage
Fig. 22
Wiring to adjust both threshold levels of option D1 or D5
1
2
3
4
5
6
7
8
9
D-SUB
06148a
Rx
Change threshold
Ry
VCC
GND1
D-adj
Table 17: Options D1 and D5: Trigger and switch-on levels
Model
Battery
Vo low D1
Vo low D5
VBat
trigger switch on
[V ]
[V]
LWR/LWN1140
12
11.5
12.1
10.5
12.1
LWR/LWN1240
24
23
24.2
21
24.2
LWR/LWN1840
36
34.4
36.3
31.5
36.3
LWR/LWN1740
48
46
48.4
42
48.4
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