PIM400 Datasheet, PDF (13/20 Pages) Lineage Power Corporation – -36 to -75 Vdc; 400W/10A

GE
PIM400 Series; ATCA Board Power Input Modules
-36 to -75 Vdc; 400W/10A
Data Sheet
PIM400X module does not regulate or provide isolation from
the input -48V A/B feeds.
The main functionality of the module is to provide -48V A/B
Feeds OR’ing, inrush protection for hot swap capability and EMI
filtering to attenuate the noise generated by the downstream
DC/DC converters.
 The -48V_OUT pin connects to the Vin(-) pin and the
VRTN_OUT pin connects to the Vin(+) pin of the DC/DC
converter(s).
 The -48V_OUT bus may require a fuse depending on
the power and fusing requirements of the DC/DC
converter.
 Input filtering of the DC/DC converter is provided by
C_FLTR close to the input pins of the DC/DC
converter(s); additional high frequency decoupling
ceramic capacitors (0.01 to 0.1μF are recommended
for improved EMI performance.
 The maximum C_FLTR capacitance across all the
downstream DC/DC converters should not exceed
270μF.
 The minimum C_FLTR capacitance (80μF)
recommendation is based on meeting the EMI
requirements.
Holdup Capacitor Output Voltage (V_HLDP)
This output provides the user settable high voltage to charge
the C_HLDP capacitor(s) to allow the ATCA board to meet the
5ms, 0Volts transient requirements.
 The V_HLDP pin connects to the +ve terminals of the
C_HLDP capacitors while the –ve terminals of the
C_HLDP connects to the -48V_OUT bus.
 The C_HLDP capacitance is dependent on the system
power and the holdup time requirements based on
the following formula
Where THU is the desired holdup time, PHU is the holdup power
drawn from the holdup capacitors (=input power of the
downstream DC/DC bus converter + Management Power),
V_HLDP is the trimmed holdup capacitor voltage and VUV is the
undervoltage lockout threshold of either the downstream bus
or the Management Power DC/DC converter (higher of the two).
Holdup Capacitor Trim Voltage (TRM_HLDP)
The resistor R_TRIM sets the external holdup capacitor voltage
to the desired setting. The output voltage is adjustable from 50
to 90V. The resistor, R_TRIM is selected by the following
equation:
capacitance to less than -60Vdc and less than 20 joules within
one second of disconnection from the backplane.
Management Power (+3V3, +5V0)
Two isolated secondary output voltages (+3V3 & +5V0) are
provided for ATCA Front Board’s IPM/System Controller (3.3V)
and for the Blue LED’s (5.0V) power requirements. Both the
outputs are referenced to LOGIC_GND.
 The management power is available even when the
input voltage is down to –36Vdc.
 No additional output capacitors are required, but a
22μF tantalum/ceramic and a 0.01 to 0.1μF ceramic
capacitors are highly recommended to contain the
switching ripple and noise.
Input Fault Alarm Signal (ALARM)
Both the input feeds, -48V_AF & -48_BF are monitored via the -
48V_ALARM signal. In the event of a loss of power from either
feeds (-48V_A or -48V_B) or the opening of their respective
fuses, the -48V_ALARM shall change its logical state indicating
a fault. During normal operation, the signal is Low. During fault
condition, the alarm signal shall assume a HI state when the
ALARM pin is pulled up to an external pull voltage (maximum
5.0V) via an external pullup resistor (RPullup). The ALARM output is
internally referenced to the LOGIC_GND. A 3.3K pull up resistor
to 3.3V Management Power should suffice.
EMI Filtering
The module incorporates an EMI filter that is designed for the
ATCA board to help meet the conducted emissions
requirements of CISPR 22 Class B when used in conjunction
with GE’s DC/DC bus converters recommended for ATCA
applications.
The following Figure 14 depicts the Class B EMI performance of
PIM400F when tested with GE’s bus converter, QBVW033A0B1
with both modules mounted on the PIM400 Evaluation Board
together with additional high frequency EMI capacitors (Fig 15).
High Voltage Discharge Mechanism:
Per the PICMG 3.0 specifications, the PIM400 provides an
internal discharge mechanism to discharge the holdup/bulk
Figure 14. Typical Class B EMC signature of PIM400F
as tested with GE’s bus converter, QBVW033A0B1
module.
June 20, 2013
©2013 General Electric Company. All rights reserved.
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