ViewSonic PJ870 Service Manual - Page 71

Power, Specification

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P J870 (/) 7-3 DC-DC Power Specification z 7-3.1 DC-DC Power Requirements Description General : Efficiency, Overall, Min. Load, Nominal Load Variation, Max. Output Voltage Variation, No Load Operation Start Cycle Time, Max. Start Sequencing Start Period, All Voltages Input Input Requirements Output : Standby Output Power Over Voltage Protection, Limit Points RctlailkWat Ment. 85% Input voltage is 392Vdc with max. load 90% of Max. For each individual DC output voltage DC-DC output voltage shall meet all 10% requirements while the load is within measured from 90% (expected typical) of max. load. The DC ouput vltages shall not exceed this tolerance under no load conditions. No part of 6% the IPS subsystem shall be damaged. Nor shall over voltage protection circuitry activate, as a result of no load operation. 0.5 Seconds All operation voltage available. No order All voltages shall monotonically arrive within specification limits, and remain. All voltages, first to last, shall monotonically 50 milliseconds arrive within specification limits, and remain within specification limits. Within this period. 400Vdc ± 8Vdc Output of AC-DC converter (PFC) None No DC output standby power voltage is required, expected fan voltage. Refer to 7-3.2 Over voltage protection limits may exceed the recommended operating limits of the projector electroniccs and may affect reliability of those electronics if applied for an extended period of time. Additionally, the over voltage protection electronics shal utilize circuitry that will fail in the short circuit, rather than open circuit mode. ViewSonic Corporation 7-11 ] : Confidential - Do Not Copy

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P
J870
(/)
7-3
DC
-DC
Power
Specification
7-3.1
DC
-DC
Power
Requirements
Description
RctlailkWat
Ment.
General
:
Efficiency,
Overall,
Min.
85%
Input
voltage
is
392Vdc
with
max.
load
Load,
Nominal
90%
of
Max.
For
each
individual
DC
output
voltage
Load
Variation,
Max.
10%
DC
-DC
output
voltage
shall
meet
all
requirements
while
the
load
is
within
measured
from
90%
(expected
typical)
of
max.
load.
Output
Voltage
Variation,
No
Load
Operation
6%
The
DC
ouput
vltages
shall
not
exceed
this
tolerance
under
no
load
conditions.
No
part
of
the
IPS
subsystem
shall
be
damaged.
Nor
shall
over
voltage
protection
circuitry
activate,
as
a
result
of
no
load
operation.
Start
Cycle
Time,
Max.
0.5
Seconds
All
operation
voltage
available.
Start
Sequencing
No
order
All
voltages
shall
monotonically
arrive
within
specification
limits,
and
remain.
Start
Period,
All
Voltages
50
milliseconds
All
voltages,
fi
rst
to
last,
shall
monotonically
arrive
within
specification
limits,
and
remain
within
specification
limits.
Within
this
period.
Input
Input
Requirements
Output
:
400Vdc
±
8Vdc
Output
of
AC
-DC
converter
(PFC)
Standby
Output
Power
None
No
DC
output
standby
power
voltage
is
required,
expected
fan
voltage.
Over
Voltage
Protection,
Limit
Points
Refer
to
7-3.2
Over
voltage
protection
limits
may
exceed
the
recommended
operating
limits
of
the
projector
electroniccs
and
may
affect
reliability
of
those
electronics
if
applied
for
an
extended
period
of
time.
Additionally,
the
over
voltage
protection
electronics
shal
utilize
circuitry
that
will
fail
in
the
short
circuit,
rather
than
open
circuit
mode.
z
7-
1
1
]
ViewSonic
Corporation
:
Confidential
-
Do
Not
Copy