Delta Q48SR User Manual

FEATURES

 High efficiency: 91% @ 3.3V/50A

 Standard footprint:

57.9x36.8x10.4mm (2.28”x1.45”x0.41”)

 Industry standard pin out

 Fixed frequency operation

 Wide output trim range 1.7V~3.6V

 Fully protected: OTP, OVP, OCP, UVLO

 No minimum load required

 Fast transient response

 Start up into pre-biased load

 Basic insulation

 ISO 9000, TL 9000, ISO 14001 certified

manufacturing facility

 UL/cUL 60950 (US & Canada) recognized,

and TUV (EN60950) certified

 CE mark meets 73/23/EEC and

93/68/EEC directives

Delphi Series Q48SR, 165W Quarter Brick Family
DC/DC Power Modules: 48V in, 3.3V/50A out

The Delphi Series Q48SR Quarter Brick, 48V input, adjustable single

output, isolated, open frame DC/DC converters are the latest offering

from a world leader in power systems technology and manufacturing —

Delta Electronics, Inc. This product family provides up to 165 watts of

power or up to 60A of output current in an industry standard footprint.

This product represents the next generation of design technology which

may be utilized to provide high levels of current at very low output

voltages required by today’s leading-edge circuitry. Utilizing an advanced

patented thermal and electrical design technology; the Delphi Series

Q48SR converters are capable of providing higher output current

capability with excellent transient response and lower common mode

noise. Featuring a wide operating output voltage range and high current

at low output voltages, these units offer more useable power over a wide

range of ambient operating conditions. The wide range trimmable output

feature allows the user to both reduce and standardize part numbers

across different and/or migrating voltage requirements. This model

covers the output range of 1.7V to 3.6Vat 50A.

OPTIONS

 Short lead lengths

 Non-latching over voltage protection

 Negative trim

 Positive on/off logic

APPLICATIONS

 Telecom/DataCom

 Wireless Networks

 Optical Network Equipment
 Server and Data Storage

 Industrial/Test Equipment

DATASHEET
DS_Q48SR3R350_12212004

1

Delta Electronics, Inc.

TECHNICAL SPECIFICATIONS

r

(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted; mounted on board.)

PARAMETER

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous

Transient (100ms) 100ms 100 Vdc
Operating Temperature Refer to Figure 24 for measuring point -40 120 °C
Storage Temperature
Input/Output Isolation Voltage 1 minute 1500 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage
Input Under-Voltage Lockout

Turn-On Voltage Threshold

Turn-Off Voltage Threshold

Lockout Hysteresis Voltage

Maximum Input Current 100% Load, 36Vin 5.9 A
No-Load Input Current 100 150 mA
Off Converter Input Current 10 20 mA
Inrush Current(I2t) 0.03 A2S
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 10 mA
Input Voltage Ripple Rejection 120 Hz 70 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=48V, Io=Io.max, Ta=25C 3.25 3.3 3.35
Output Voltage Regulation

Over Load Io=Io,min to Io,max ±2 ±5 mV

Over Line Vin=36V to 75V ±2 ±5 mV

Over Temperature Tc=-40C to 100C ±50 ±100 mV

Total Output Voltage Range over sample load, line and temperature 3.17 3.43 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 30 100 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 10 20 mV

Operating Output Current Range 0 50 A
Output DC Current-Limit Inception Output Voltage 10% Low 105 130 %

DYNAMIC CHARACTERISTICS

Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs

Positive Step Change in Output Current 50% Io,max to 75% Io,max 70 150 mV

Negative Step Change in Output Current 75% Io,max to 50% Io,max 70 150 mV

Settling Time (within 1% Vout nominal) 100 uS

Turn-On Transient

Start-Up Time, From On/Off Control 15 30 mS

Start-Up Time, From Input 15 30

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 20000 µF

EFFICIENCY

100% Load
60% Load 91 %

ISOLATION CHARACTERIS TICS

Input to Output 1500 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 2000 pF

FEATURE CHARACTERISTICS

Switching Frequency 400 kHz
ON/OFF Control, (Logic Low-Module ON)

Logic Low Von/off at Ion/off=1.0mA 0 0.8 V

Logic High Von/off at Ion/off=0.0 µA 15 V

ON/OFF Current Ion/off at Von/off=0.0V 1 mA

Leakage Current Logic High, Von/off=15V 50 uA
Output Voltage Trim Range Across Pins 9 & 5, Pout <= max rated powe
Output Voltage Remote Sense Range Pout <= max rated power 10 %
Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 130 145 %

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Ta=25°C, airflow rate=300 LFM 1.7 M hours
Weight 36 grams
Over-Temperature Shutdown Refer to Figure 24 for measuring point 125 °C

NOTES and CONDITIONS Q48SR3R350Nx A

Min. Typ. Max. Units

80 Vdc

-55 125 °C

36 48 75 Vdc

33 34 35 Vdc
31 32 33 Vdc

1 2 3 Vdc

91 %

1.7 3.6 V

Vdc

mS

2

ELECTRICAL CHARACTERISTICS CURVES

95

90

EFFICIENCY (%)

85

80

75

70

65

36Vin 48Vin 75Vin

60

10 20 30 40 50

OUTPUT CURRENT (A)

Figure 1: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25°C. (Vout=3.3V)

95

90

24.0

36Vin 48Vin 75Vin

20.0

16.0

POWER DISSIPATION (W)

12.0

8.0

4.0

0.0
10 20 30 40 50

OUTPUT CURRENT(A)

Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25°C. (Vout=3.3V)

24.0

36Vin 48Vin 75Vin

20.0

EFFICIENCY (%)

85

80

75

70

65

36Vin 48Vin 75Vin

60

10 20 30 40 50

OUTPUT CURRENT (A)

Figure 3: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25°C. (Vout=1.7V)

16.0

POWER DISSIPATION (W)

12.0

8.0

4.0

0.0
10 20 30 40 50

OUTPUT CURRENT(A)

Figure 4: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C. (Vout=1.7V)

3

ELECTRICAL CHARACTERISTICS CURVES

94

92

EFFICIENCY (%)

90

88

24.0

36Vin 48Vin 75Vin

22.0

20.0

POWER DISSIPATION (W)

18.0

86

84

82

36Vin 48Vin 75Vin

80

1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.3

OUTPUT VOLTAGE (V)

Figure 5: Efficiency vs. output voltage for minimum, nominal, and
maximum input voltage at 25°C. (Iout=50A)

6.0

Io=50A Io=30A Io=5A

5.0

INPUT CURREN (A)

4.0

3.0

2.0

1.0

16.0

14.0

12.0

10.0

1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.3

OUTPUT VOLTAGE (V)

Figure 6: Power dissipation vs. output voltage for minimum,

nominal, and maximum input voltage at 25°C. (Iout=50A)

0.0
30 35 40 45 50 55 60 65 70 75

INPUT VOLTAGE (V)

Figure 7: Typical input characteristics at room temperature Figure 8: Turn-on transient at full rated load current (resistive

load) (5 ms/div). Top Trace: Vout; 1V/div; Bottom Trace:

ON/OFF input: 2V/div

4

ELECTRICAL CHARACTERISTICS CURVES

A

A

)

)

Figure 9: Turn-on transient at zero load current (5 ms/div).

Top Trace: Vout: 1V/div; Bottom Trace: ON/OFF input:
2V/div

Figure 10: Output voltage response to step-change in load

current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (50mV/div), Bottom Trace: Iout (20
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.

/div). Scope

Figure 11: Output voltage response to step-change in load

current (75%-50%-75% of Io, max: di/dt = 2.5A/µs). Load
cap: 470µF, 35m
ceramic capacitor. Top Trace: Vout (100mV/div), Bottom
Trace: Iout (20
using a BNC cable (length shorter than 20 inches
the load between 51 mm to 76 mm (2 inches to 3 inches
from the module.

Ω

ESR solid electrolytic capacitor and 1µF

/div). Scope measurement should be made

. Position

Figure 12: 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
battery impedance. Measure current as shown above.

) of 12 µH. Capacitor Cs offset possible

TEST

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