FEATURES
High Efficiency: 95.5% @9.6V/31A
Standard footprint: 57.9 x 36.8 x 12.7mm
(2.28”x1.45”x0.5”)
Industry standard pin out
Fully protected:OTP, OCP, Input OVP, UVLO
2250V isolation
Basic insulation
No minimum load required
Current sharing
ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing facility
UL/cUL 60950 (US & Canada), and TUV
(EN60950) Certified
CE mark meets 73/23/EEC and +3/68/EEC
directives
Delphi Series Q48SB, 300W Bus Converter
DC/DC Power Modules: 48V in, 9.6V/31A out
The Delphi Series Q48SB, 48V input, single output, quarter brick, 300W bus
converters are the latest offering from a world leader in power systems
technology and manufacturing — Delta Electronics, Inc. This product family
supports intermediate bus architectures and powers multiple downstream
non-isolated point-of-load (POL) converters. The Delphi Series Q48SB
operates from a nominal 48V input and provides up to 300W of power or up
to 31A of output current in an industry standard quarter brick footprint. The
Q48SB product currently supports two input ranges: the Q48SB120 features
an input voltage range of 42V to 53V and provides 4:1 unregulated output of
12V at 20A or 25A. The Q48SB108 features a wider input voltage range of
36V to 60V and provides 5:1 unregulated output of 9.6V at up to 31A.
Typical efficiency for the 9.6V/31A or 10.8V/28A module is 95.5%. With
optimized component placement, creative design topology, and numerous
patented technologies, the Q48SB bus converter delivers outstanding
electrical and thermal performance. An optional heatsink is available for
harsh thermal requirements.
OPTIONS
Positive On/Off logic
Short pin lengths
Heatsink available for extended
operation
APPLICATIONS
Datacom / Networking
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Testing Equipment
DATASHEET
DS_Q48SB10828_11062006
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Operating Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Input Over-Voltage Lockout
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Inrush Current(I
2
t)
Input Reflected-Ripple Current
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
60% Load
ISOLATION CHARACTERISTICS
Input to Output
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, (Logic Low-Module ON)
Logic Low
Logic High
ON/OFF Current
GENERAL SPECIFICATIONS
MTBF
Weight
Over-Temperature Shutdown
NOTES and CONDITIONS
Min.
Q48SB10828NRFA
Typ.
Max.
63
+124
+125
2250
48
35
33
2
63
61
2
5
0.02
10
9.6
10.8
400
4.8
6.6
120
30
0
31
40
150
150
50
20
20
10000
95.5
96.5
2250
10
750
130
500
5
200
12.1
60
36
34
64
62
8
120
15
Units
Vdc
°C
°C
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
A
mA
mA
A
2
s
mArms
Vdc
Vdc
mV
V
mV
V
mV
mV
A
A
mV
mV
us
ms
ms
µF
%
%
Vdc
MΩ
pF
kHz
0.8
18
1
2.88
43
127
V
V
mA
M hours
grams
°C
Refer to Figure 15 for the measuring point
-40
-55
36
34
32
62
60
30
RMS thru 12µH inductor, 5Hz to 20MHz
Vin=48V, Io=no load, Ta=25°C
Vin=54V, Io=no load, Ta=25°C
Io=Io,min to Io,max
Vin=36V to 60V
Ta=-40°C to 85°C
over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Output Voltage 10% Low
48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Io=80% of Io, max; Ta=25°C
Refer to Figure 15 for the measuring point
0
2.4
DS_Q48SB10828_11062006
2
ELECTRICAL CHARACTERISTICS CURVES
EFFICIENCY (%)
100
36Vin
98
96
94
92
48Vin
60Vin
POWER DISSIPATION (W)
24
36Vin
48Vin
60Vin
20
16
12
8
90
88
86
5
10
15
20
25
30
35
OUTPUT CURRENT (A)
4
0
5
10
15
20
25
30
35
OUTPUT CURRENT(A)
Figure 1:
Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
14
VOUT(V)
Figure 2:
Power loss vs. load current for minimum, nominal,
and maximum input voltage at 25°C.
12
10
8
6
4
2
0
0
5
10
15
20
25
30
35
40
45
OUTPUT CURENT(A)
36Vin
48Vin
60Vin
Figure 3:
Output voltage regulation vs load current showing
typical current limit curves and converter shutdown points for
minimum, nominal, and maximum input voltage at room
temperature .
DS_Q48SB10828_11062006
3
ELECTRICAL CHARACTERISTIC CURVES
Figure 4:
Turn-on transient at full rated load current (5 ms/div).
Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF input: 5V/div
Figure 5:
Turn-on transient at zero load current (2 ms/div). Top
Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 5V/div
Figure 6:
Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (200mV/div), Bottom Trace: Iout (10A/div). Scope
measurement should be made using a BNC cable (length
shorter than 20 inches). Position the load between 51 mm to 76
mm (2 inches to 3 inches) from the module.
Figure 7:
Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 1A/µs). Load
cap:10uF,tantalum capacitor and 1µF ceramic capacitor. Top
Trace: Vout (200mV/div), Bottom Trace: Iout (10A/div). Scope
measurement should be made using a BNC cable (length
shorter than 20 inches). Position the load between 51 mm to 76
mm (2 inches to 3 inches) from the module.
Figure 8:
Test set-up diagram showing measurement points for
Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (L
TEST
) of 12 µH. Capacitor Cs offset
possible battery impedance. Measure current as shown above.
DS_Q48SB10828_11062006
4
ELECTRICAL CHARACTERISTIC CURVES
Figure 9:
Input Terminal Ripple Current, i
c
, at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (200 mA/div).
Figure 10:
Input reflected ripple current, i
s
, through a 12µH
source inductor at nominal input voltage and rated load current
(5 mA/div).
Copper Strip
Vo(+)
10u
Vo(-)
1u
SCOPE
RESISTIVE
LOAD
Figure 11:
Output voltage noise and ripple measurement test
setup.
Figure 12:
Output voltage ripple at nominal input voltage and
rated load current (50 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 20 MHz.
Scope measurement should be made using a BNC cable
(length shorter than 20 inches). Position the load between 51
mm to 76 mm (2 inches to 3 inches) from the module.
DS_Q48SB10828_11062006
5
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