B Q 5 0 1 2 0 Q T A 2 0 b u s c o n v e r t e r i s a n e x t - g e n -
e ra tion , bo ar d -mo un ta bl e, is ol ated , fixe d s witchi ng fr eq uen -
c y d c/d c con verter tha t u se s s y nch r on ou s r ectifi catio n to
a ch ieve extr emel y h igh con vers ion effic ien cy. Th e p ower
d is sip a t ed b y t he con v er te r is so l ow th a t a h eat s in k is no t
r eq ui red , whic h s av es c os t, wei ght , hei ght , an d a p pl ica t ion
e ffor t. T he Bu sQ or ser ies p r ov id es a n iso la t ed s t ep d own
vol tage fr om 48V to a 1 2V inter med ia te b us with n o regu -
l a tio n i n a s ta n da r d “ q ua rt er - br ick ” mod ul e. B us Q or con -
v er t ers a r e id ea l fo r cu st om ers wh o n eed mu l tip l e ou t p ut s
a n d wish to bu il d o r bu y p oin t of loa d co nver ter s to wor k
with a 12V rail. RoHS Compliant (see page 12 ).
Bus
Conver ter
Operational Features
• Ultra-high efficiency, >96% at full rated load current
• Delivers up to 20 amps (240 Watts) of output current
(power) with minimal derating - no heatsink required
• Input voltage range: 42V – 53V
• Fixed frequency switching provides predictable EMI per-
formance
BQ50120QTA20 Module
Pr otection Features
• Input under-voltage lockout and over-voltage
shutdown protects against abnormal input voltages
• Output current limit and short circuit protection
• Output over-voltage protection
• Thermal shutdown
Mechanical Features
• Industry standard quarter-brick bus converter pin-out
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
• Total height only 0.43” (10.9mm), permits better airflow
and smaller card pitch
• Total weight: 1.5 oz. (42 grams)
• Flanged pins designed to permit surface mount solder-
ing (can avoid wave solder) using FPiP technique
Safety Features
• 2000V, 30 MW input-to-output isolation
• UL/cUL 60950-1 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Contr ol Features
• On/Off control referenced to input side
• Current sharing allowed without the use of any external
circuitry.
Product # BQ50120QTA20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512J Rev. G
10/03/11
Page 1
Technical Specification
MECHANICAL
DIAGRAM
2.30
(58.4)
Input:
Output:
Current:
Package:
42-53 V
12 V
20 A
Quarter-brick
0.14
(3.6)
2.00
(50.8)
0.43
(10.8)
Top View
0.600
(15.24)
1.45
(36.8)
0.600
(15.24)
0.300
(7.62)
Side View
0.43
(10.9)
Bottom side
Clearance
See Note 9
0.060+/-0.030
(1.52+/-0.76)
Lowest
Component
Load Board
Flanged Pin
See Note 10
0.145
(3.68)
See Note 3
NOTES
1) Pins 1-3 are 0.040” (1.02mm) diameter with 0.080”
(2.03 mm) diameter standoff shoulders.
2) Pins 4 and 5 are 0.062” (1.57 mm) diameter with 0.100”
(2.54 mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish (6/6 RoHS) - Matte Tin over Nickel plate
Finish (5/6 RoHS) - Tin/Lead over Nickel plate
5) Undimensioned components are shown for visual reference
only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 1.5 oz. (42 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance of 0.04” (1.02mm)
around primary areas of the module. Refer to section on
Keep Out Areas under Application Considerations for
details.
10) The flanged pins are designed to permit surface mount
soldering (allowing to avoid the wave soldering process)
through the use of the flanged pin-in-paste technique.
Product # BQ50120QTA20
Phone 1-888-567-9596
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
Name
Vin(+)
ON/OFF
Vin(-)
Vout(-)
Vout(+)
Function
Input Positive (42V - 53V)
Logic control input to turn
converter on and off.
Input Negative
Output Negative
Output Positive
www.synqor.com
Doc.# 005-2BQ512J Rev. G
10/03/11
Page 2
Technical Specification
BQ50120QTA20 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input:
Output:
Current:
Package:
42-53 V
12 V
20 A
Quarter-brick
T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient tem-
perature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
56
2000
100
125
12
48
39.5
38.0
1.5
55.0
54.0
7.5
5
75
1\1.5\2
47
12.00
+10 \ 1.2
+4.1 \ 500
+1.7 \ 200
30
15
24.8
8
+10
10
53
Units
V
V
V
°C
°C
V
V
V
V
V
V
V
A
A
mA
A
2
s
mA
mA
A
µF\µH\µF
µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
V
%
mA
µF
mV
µs
ms
ms
%
%
%
Notes & Conditions
Continuous
Continuous
Basic insulation, Pollution Degree 2
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
-40
-55
-2
42
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse
1
Input Filter Component Values (C\L\C)
Recommended External Input Capacitance
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
2
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (2 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
100% Load
50% Load
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
6.3
0.17
15
0.01
100
12
Vin when unit will shut down
Vin when unit turns on after shutdown event
100% Load, 42 Vin
I
2
T rating of external fuse should be higher
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 12 & 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2W; see Figure 12
48Vin, no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 12 & 15
Full Load; see Figures 12 & 15
Full Load; see Figures 12 & 15
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low; Figure 16
% of rated output current
Negative current drawn from output
12Vout at 20A Resistive Load
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C; Figure E
5,000 µF load capacitance, Iout = 0A
Figure 1
Figure 1
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
OUTPUT CHARACTERISTICS
9.7
13.3
60
20
20
0
3,000
DYNAMIC CHARACTERISTICS
200
100
2.5
2
5
96.5
96.3
125
125
125
2000
30
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
°C
°C
°C
V
M
W
pF
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
3
Isolation Resistance
Isolation Capacitance
4
470
Note 1: UL's product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account while
designing input traces. User should ensure that Input trace is capable of withstanding fault currents until fuse blows.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 3: For modules with isolation voltage rating of 2250V, order the Feature Set option C. See last page for ordering details.
Note 4: Higher values of isolation capacitance can be added external to the module.
