Q48T20050 and Q48S20050
36-75 Vdc Input, 20 A, 5.0 Vdc Output
The
Q48T20050
through-hole and
Q48S20050
surface
mounted DC/DC converters offer unprecedented perform-
ance in the industry-standard quarter brick format. This is
accomplished through the use of patent pending circuit and
packaging techniques to achieve ultra-high efficiency, excel-
lent thermal performance and a very low body profile.
Data Sheet
&&
In telecommunications applications the
Q
Family
20 A con-
verters provide thermal performance that exceeds competing
quarter bricks with a higher nominal rating. Low body profile
and the preclusion of heatsinks minimize airflow shadowing,
thus enhancing cooling for downstream devices. The use of
100% surface-mount technologies for assembly, coupled
with di/dt’s advanced electric and thermal circuitry and pack-
aging, results in a product with extremely high quality and
reliability.
25
Q48T20050 and Q48S20050 Converters
Features
20
Load Current [Adc]
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
10
5
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1:
Available load current vs. ambient air temperature and air-
flow rates for Q48T20050 converter with D height pins mounted
vertically with air flowing from pin 3 to pin 1, MOSFET temperature
≤
120°C, Vin = 48 V.
Applications
•
•
•
•
Telecommunications
Datacommunications
Wireless
Servers
Delivers up to 20 A
High efficiency: 86% @ 20 A, 88% @ 10 A
Starts-up into pre-biased output
No minimum load required
No heatsink required
Lowest profile in industry: 0.28” [7.2 mm] TH ver-
sion, 0.26” [6.6 mm] SMT version
Lowest weight in industry: 1 oz [28 g] typical
Industry-standard footprint: 1.45” x 2.30”
Industry-standard pinout (TH version)
Meets Basic Insulation Requirements of EN60950
Withstands 100 V input transient for 100 ms
On-board LC input filter
Fixed frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/-20%
Trim resistor via industry-standard equations
High reliability: MTBF 2.6 million hours, calculated per
Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 recognized in U.S. & Canada, and DEMKO
certified per IEC/EN 60950
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
Q48x20050 FDS Ver 3 11-07-03
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Page 1 of 15
Q48T/S20050
36-75 Vdc Input, 20 A, 5.0 Vdc Output
Electrical Specifications
Conditions: T
A
=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, unless otherwise specified.
Data Sheet
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
NOTES
MIN
0
-40
-55
36
TYP
MAX
80
85
125
UNITS
Vdc
°C
°C
Vdc
Vdc
Vdc
Vdc
µF
Adc
Adc
A
Arms
Vdc
ρF
MΩ
kHz
%
%
%
°C
ms
ms
Vdc
Vdc
Vdc
Vdc
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
48
34
32
75
35
33
100
10,000
20
26
45
6.7
Non-latching
33
31
100 ms
Plus full load (resistive)
Non-latching
Non-latching. Short=10mΩ.
Non-latching
0
21
23.5
30
OUTPUT CHARACTERISTICS
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
Isolation Resistance
2000
200
10
415
Use trim equations on Page 7
1
FEATURE CHARACTERISTICS
Switching Frequency
1
Output Voltage Trim Range
Remote Sense Compensation
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
Converter On
ON/OFF Control (Negative Logic)
Converter Off
Converter On
-20
117
122
125
100
3
+10
+10
127
Percent of V
OUT
(
NOM
)
Non-latching
Non-latching
Applies to all protection features
-20
2.4
2.4
-20
0.8
20
20
0.8
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of V
OUT
(
NOM
), in order to insure specified operation of over-voltage protection circuitry. See further discussion at end of
Output Voltage Adjust /TRIM
section.
Q48x20050 FDS Ver 3 11-07-03
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Page 2 of 15
Q48T/S20050
36-75 Vdc Input, 20 A, 5.0 Vdc Output
Electrical Specifications (continued)
Conditions: T
A
=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, unless otherwise specified.
Data Sheet
PARAMETER
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
NOTES
20 Adc, 5.0 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
See Figure 25 - 25MHz bandwidth
120Hz
-40ºC to 85ºC
MIN
TYP
MAX
3.25
UNITS
Adc
mAdc
mAdc
mA
PK-PK
dB
Vdc
mV
mV
Vdc
mV
PK-PK
mV
mV
µs
%
%
3
68
10
TBD
4.950
5.000
±2
±2
5.050
±5
±5
5.075
50
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Co = 1 µF ceramic (Fig.20)
Co = 450 µF tant. + 1 µF ceramic (Fig.21)
4.925
30
80
100
100
86
88
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS
di/dt = 5 A/µS
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
Q48x20050 FDS Ver 3 11-07-03
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Page 3 of 15
Q48T/S20050
36-75 Vdc Input, 20 A, 5.0 Vdc Output
Physical Information (Through-Hole)
Data Sheet
Pin Connections
Pin #
1
2
3
4
5
6
7
8
Function
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
2
3
8
7
TOP VIEW
6
5
4
SIDE VIEW
•
•
•
•
•
•
All dimensions are in inches [mm]
Pins 1-3 and 5-7 are Ø 0.040” [1.02]
with Ø 0.078” [1.98] shoulder
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 1 oz [28 g] typical
Height
Option
A
B
C
D
HT
(Maximum Height)
+0.000 [+0.00]
-0.038 [-0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
CL
(Minimum Clearance)
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
Pin
Option
A
B
C
PL
(Pin Length)
±0.005 [±0.13]
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated
Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height (HT)
Pin
Length (PL)
Special
Features
Q
Quarter-Brick
Format
48
36-75 V
T
Through-
hole
20
20 Adc
050
050
⇒
5.0 V
-
N
N
⇒
Negative
P
⇒
Positive
B
A
⇒
0.303”
B
⇒
0.336”
C
⇒
0.500”
D
⇒
0.400”
A
A
⇒
0.188”
B
⇒
0.145”
C
⇒
0.110”
0
0
⇒
STD
The example above describes P/N Q48T20050-NBA0: 36-75 V input, through-hole mounting, 20 A @ 5.0 V output, negative ON/OFF logic, a
maximum height of 0.336”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
Q48x20050 FDS Ver 3 11-07-03
USA Toll Free 866 WOW-didt
Page 4 of 15
Q48T/S20050
36-75 Vdc Input, 20 A, 5.0 Vdc Output
Physical Information (Surface Mount)
Data Sheet
Pin Connections
Pin #
1
2
3
4
5
6
7
8
Function
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
2
3
8
7
TOP VIEW
6
5
4
SIDE VIEW
•
•
•
•
•
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 1 oz [28 g] typical
Recommended Surface-Mount Pads:
Min. 0.080” x 0.112” [2.03 x 2.84]
Max. 0.092” x 0.124” [2.34 x 3.15]
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated
Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height
Pin
Length
Special
Features
Q
Quarter-Brick
Format
48
36-75 V
S
Surface
Mount
20
20 Adc
050
050
⇒
5.0 V
-
N
N
⇒
Negative
P
⇒
Positive
S
S
⇒
0.273”
0
0
⇒
0.00”
0
0
⇒
STD
The example above describes P/N Q48S20050-NS00: 36-75 V input, surface mounting, 20 A @ 5.0 V output, negative ON/OFF logic. Please
consult factory regarding availability of a specific version.
Q48x20050 FDS Ver 3 11-07-03
USA Toll Free 866 WOW-didt
Page 5 of 15
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