LS4301-7R POWER-ONE [Power-One], LS4301-7R Datasheet - Page 25

• Manufacturer Part Number: LS4301-7R
• Description: 100 Watt AC-DC Converters with PFC
• Manufacturer: POWER-ONE [Power-One]

Cassette Style
Option V operates independently of the built-in input under-
voltage lock-out circuit. A logic "low" signal is generated at
pin 20 as soon as one of the monitored voltages drops be-
low the preselected threshold level U
signal is Vo1–. The V output recovers when the monitored
voltage(s) exceed(s) U
justed in the factory to 355 V DC. The threshold level U
either is adjusted during manufacture to a determined cus-
tomer specified value.
Edition 01/01.2001
V ACFAIL Signal (VME)
Available for units with U
This option defines an undervoltage monitoring circuit for
the input or input and main output voltage equivalent to op-
tion D and generates the ACFAIL signal (V signal) which
conforms to the VME standard.
The low state level of the ACFAIL signal is specified at a
sink current of I
put of a NPN transistor). The pull-up resistor feeding the
open-collector output should be placed on the VME back
plane.
After the ACFAIL signal has gone low, the VME standard
requires a hold-up time t
output drops to 4.875 V when the output is fully loaded.
This hold-up time t
tance. See also fig.: Hold-up Time versus Output Power .
Table 20: Undervoltage monitor functions
1
2
(VME compatible)
Option D monitors the boost regulator output voltage. The trig-
ger level is adjusted in the factory to 355 V DC.
Fixed value between 95% and 98.5% of U
V output
V2
V3
V
h
48 mA to U
yes
yes
Monitoring
is provided by the internal input capaci-
U
i
t
+ U
h
o1
yes
of at least 4 ms before the 5.1 V
no
U
= 5.1V
h
o1
. The threshold level U
V
355V DC
355V DC
range of threshold level
0.6 V (open-collector out-
Minimum adjustment
U
ti
t
. The return for this
o1
1
1
.
100 Watt AC-DC Converters
0.95...0.985 U
U
–
to
ti
is ad-
o1
to
2
V output (V2, V3):
Connector pin V is internally connected to the open collec-
tor of a NPN transistor. The emitter is connected to the
negative potential of output 1. U
sponds to a monitored voltage level ( U
The current I
ceed 50 mA. The NPN output is not protected against ex-
ternal overvoltages. U
Fig. 39
Output configuration of options V2 and V3
U
i
and U
U
i
U
or U
i
, U
o1
o1
o1
V
status
U
through the open collector should not ex-
U
t
+ U
t
h
V
should not exceed 60 V.
high, H, I
low, L, U
V
0.6 V (logic low) corre-
11009
V
V
V output, U
25 A at U
0.6 V at I
i
Vo1+
V
Vo1–
and/or U
S Series PFC
I
V
U
V
V
V
V
= 50 mA
o1
= 5.1 V
R
p
) U
25/27
t
.