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参数资料
| 型号： | PSC159-2IR |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 12/12页 |
| 文件大小： | 198K |
| 代理商： | PSC159-2IR |
PSC Series Extended Data Sheet
Positive Switching Regulators (Benign)
REV. MAY 12, 2004
Page 9 of 12
Table 8: Insulation concept leading to an SELV output circuit
Conditions Front end
Switching regulator
Result
Supply
Minimum required grade
Maximum
Minimum required safety
Measures to achieve the
Safety status of
voltage
of isolation, to be provided DC output
status of the front end
specified safety status of the
the switching
by the AC-DC front end,
voltage
output circuit
regulator output
including mains supplied
from the
circuit
battery charger
front end 1
Battery
Double or Reinforced
≤60 V
SELV circuit
None
SELV circuit
supply,
considered
as secon-
dary circuit
Mains
Basic
≤60 V
Earthed SELV circuit 2
None
Earthed SELV
≤250 V AC
ELV circuit
Input fuse 3 and earthed output
circuit
circuit 2 or non accessible
case 4
Double or reinforced
≤60 V
SELV circuit
None
SELV circuit
1 The front end output voltage should match the specified input voltage range of the switching regulator.
2 The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
3 The installer shall provide an approved fuse (slow blow type with the lowest current rating suitable for the application, max.12.5 A) in
a non-earthed input conductor directly at the input of the switching regulator. If Vo+ is earthed, insert the fuse in the Gi- line. For UL’s
purpose, the fuse needs to be UL-listed. If option C is fitted, a suitable fuse is already built-in in the Vi+ line.
4 Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum
output voltage from the front end.
Description of Options
With this series, the options i (inhibit) and R (control input
for output voltage adjustment) are defined as a package.
Other combinations or parts of this package are not
available.
R Control for Output Voltage Adjustment
Note:
With open R input,
Vo
≈ Vo nom.
The output voltage
Vo can either be adjusted with an exter-
nal reference voltage (
Vext) or with an external resistor
(
Rext). The adjustment range is 0 - 100% of Vo nom. The
Fig. 7
Voltage adjustment with Vext between R and G (Go–)
Vo
Vext
≈ 2.5 V –––––
Vo
≈ Vo nom –––––
Vo nom
2.5 V
Vo+
R
+
4000
G
Vref
Vext
–
+
06035
Caution: To prevent damage
Vext must neither exceed
2.7 V, nor be negative!
Fig. 8
Voltage adjustment with external resistor Rext
4000
Vo
Vo nom Rext
Rext
≈ –––––––––––
Vo
≈ ––––––––––––
Vonom – Vo
Rext + 4000
Vo +
R
–
+
G
4000
Uref
Rext
Go –
06040
minimum differential voltage
DVio min between input and out-
put (see:
Electrical Input Data) should be maintained.
Undervoltage look-out = minimum input voltage.
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