The semi-regulated, wide input Quarter-Brick Intermediate Bus
Converter (IBC) model is a new high efficiency, open-frame,
isolated, 28A converter in an industry standard quarter-brick
footprint. This IBC provides designers with an extremely energy-
efficient, cost effective solution for main on-board power source in
12VDC distributed power systems. In these systems, the IBC is
intended primarily for powering multiple downstream non-
isolated point-of-load (POL) converters. Operating from a 36 to
75VDC supply, this converter will also optimize the performance of
its downstream POL converters by maintaining a constant output
voltage independent of line fluctuations that are common in
telecom applications.
Additionally, a patent pending, full wavecoupled inductor
topology yields some of the highest full load efficiencies in the
industry. All Quarter-Brick converters have, as standard features,
remote ON/OFF capability, overcurrent, overvoltage and
undervoltage protection and full international safety approval
including EN60950-1 VDE and UL/cUL60950-1.
Technical Reference Note -
QUARTER-BRICK SERIES
Semi-regulated 12 Volt Output
Rev.12.12.07
quarter-brick series
2 of 12
Stresses in excess of the maximum ratings can cause permanent damage to the device. Operation of the device is not implied at these or any other conditions
in excess of those given in the specification. Exposure to absolute maximum ratings can adversely affect device reliability.
Absolute Maximum Ratings
Characteristic
Input voltage - continuous
Input voltage -peak/surge
Input voltage - remote pin
Operating temperature
Storage temperature
Output power
Symbol
Vin (cont)
Vin (peak)
Vrem (peak)
Top
Tstorage
Pout (max)
Min
-0.3
-0.3
Typ
Max
75
100
Units
V DC
V DC
Notes and Conditions
Vin(+) - Vin(-)
Transients of 100 msec or less,
in duration
Peaks of any duration
Measured at hotspot
-0.3
-40
-55
20
120
125
336
V DC
°C
°C
W
All specifications are typical at nominal input Vin =
48V,
and with full rated resistive load at 25˚C ambient unless otherwise specified.
Input Characteristics
Characteristic
Input voltage - operating
Input current - no load
Input current - quiescent
Inrush current (I
2
t)
Inrush current ratio
Input ripple rejection
Input fuse
Symbol
Vin (oper)
lin
lin (off)
Iinrush
It/Im
Min
36
Typ
48
120
5.5
0.14
22
50
20
dB
A
Frequency <1kHz
Slow Blow/Antisurge HRC
recommended 250V Rating.
See Application Note 190
Max
75
140
8
Units
V DC
mA DC
mA DC
A
2
S
Vin (min) to Vin (max), enabled
Converter disabled
Notes and Conditions
Turn On/Off
Characteristic
Input voltage - turn on
Input voltage - turn off
Turn on delay - enabled,
then power applied
Symbol
Vin (on)
Vin (off)
Tdelay (power)
32
Min
Typ
34.5
33
15
25
Max
36
Units
V DC
V DC
msec
With Remote ON/OFF signal
asserted, time from when Vin >
Vin (oper) until Vout is within
total regulation band
With Vin = Vin (nom), then
remote ON/OFF asserted, time
until Vo is within total error band
Rise time
Trise
3
6
msec
From 10% to 90%, full resistive
load, no external capacitance
Notes and Conditions
Turn on delay - power
applied, then enabled
Tdelay
5
8
msec
Technical Reference Note -
QUARTER-BRICK SERIES
Semi-regulated 12 Volt Output
Rev.12.12.07
quarter-brick series
3 of 12
Signal Electrical Interface
Characteristic
At remote ON/OFF (control) pin
Open collector or equivalent
compatible
Control pin open circuit voltage
High level input voltage
Vih
Vih
2.4
4.6
5.0
20
V
V
Vih (min)
High level input current
Iih
10
μA
Current flowing into control pin
when pin is pulled high
(max. at Vih = 75V)
Acceptable leakage current from
signal pin into the open collector
driver (neg = from converter)
Converter guaranteed OFF
when control pin is less than
Vil (max)
ViI = 0.0V, maximum source
current from converter with short
circuit
Iih = 0μA; open circuit voltage
Converter guaranteed ON when
when control pin is greater than
Symbol
Min
Typ
Max
Units
Notes and Conditions
See Notes 1 and 2
Acceptable high level
leakage current
Iih (leakage)
-10
μA
Low level input voltage
ViI
-0.3
0.4
V
Low level input current
Iil (max)
-0.6
-0.75
mA
Common Protection/Control
Characteristic
Overtemperature shutdown
threshold
Symbol
Tots
Min
120
Typ
125
Max
130
Units
°C
Notes and Conditions
Hotspot temperature, non-
latching shutdown protection.
See Application Note 190
Reliability and Service Life
Characteristic
Mean time between failure
Symbol
MTBF
Min
Typ
5,467,917
Max
Units
Hours
Notes and Conditions
Telcordia Tech. SR-332
Tamb = 25°C, Tcase = 20°C rise
airflow = 400LFM,
Vin = Vin (nom),
Iout = 50% Iout (max)
Isolation
88Characteristic
Input to output test voltage
Input to output capacitance
Input to output resistance
Input to output insulation system
10
Basic
1200
Symbol
Min
Typ
Max
2,250
Units
V DC
pF
MΩ
Measured with 500VDC
Notes and Conditions
Test duration 1s
Technical Reference Note -
QUARTER-BRICK SERIES
Semi-regulated 12 Volt Output
Rev.12.12.07
quarter-brick series
4 of 12
Other Specifications
Characteristic
Switching frequency
Symbol
fsw
Min
Typ
400
Max
Units
kHz
Notes and Conditions
Fixed frequency (all models)
Environmental Specifications
Characteristic
Thermal performance
Altitude
Symbol
Min
-40
Typ
Max
120
3,000
9843
10,000
32,808
Parameter
Reference
IEC 60068-2-1 Ab/Ad:
Cold
IEC680068-2-2 Bb/Bd:
Dry heat
IEC 68-2-14 Nb: Rate of
change
Relative humidity
IEC 60068-2-56 Cb: damp
heat, steady state
Vibration
IEC60068-2-6 Fc:
sinusoidal
Test Level
-40°C, 16h
+70°C, 16h
-5°C/+45°C, 0.5°C/min 2 cycles, 3h ea
Units
°C
m
ft
m
ft
Notes and Conditions
Hotspot temperature
derate total max. output current
by 20%
derate total max. output current
by 50%
Type
Air temperature
+35°C, 93% RH, 4 days 50% of samples powered at
10% load and 50% unpowered
3 axes, 5 sweeps per axis unpowered on test card
Freq. range and displacement 5-9Hz, 1.2mm
Freq. Range and acceleration 9-200Hz, 10m/s
2
100 bumps each of 6 directions, mounted on powered on
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