SynQor BQ60120HEB30NRS Half-brick dc/dc converter Datasheet

Technical
S pecification
BQ60120HEA30
35-75V
12V
360Watt
2250Vdc
Half-brick
Input
Output
Power
Isolation
DC/DC Conver ter
The BQ60120HEA30 BusQor ™ Exa series converter is a
next-generation, board-mountable, isolated, wide input, reg ulated, fixed switching frequency DC/DC converter that uses
synchronous rectification to achieve extremely high conver sion efficiency. The BusQor Exa series provides an isolated
step down voltage from 35-75V to 12V with tight output volt age regulation in a standard “half-brick” module and is avail able in open-frame and baseplated version. BusQor con verters are ideal for customers who need multiple outputs and
wish to use point of load converters to work with a 12V rail.
T h e B u s Q o r E x a s e r i e s c o n v e rt e r s o f f e r i n d u s t r y - l e a d i n g u s e able output current for powering intermediate bus architech ture systems. RoHS 5/6 compliant (see page 12 ).
Bus
Conver ter
BQ60120HEA30 Module
Operational Features
• Ultra-high efficiency, 95% at full rated load current
• Delivers up to 360 Watts of output power, subject to
derating over temperature and airflow
• Wide input voltage range: 35V – 75V, with 100V
100ms input voltage transient withstand capability
• Fixed frequency switching provides predictable EMI
performance
Mechanical Features
• Industry standard half-brick pin-out configuration
• Industry standard size: 2.3” x 2.4” (58.4 x 61mm)
• Total height 0.45” (11.5mm), permits better airflow and
smaller card pitch (0.54” baseplated module)
• Total weight: 2.6 oz. (75 grams) for open-frame
Safety Features
• 2250V, 30 MΩ 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
Product # BQ60120HEA30
Phone 1-888-567-9596
www.synqor.com
Pr otection Features
•
•
•
•
•
Input under-voltage lockout
Output current limit and short circuit protection
Output over-voltage protection
Thermal shutdown
Backdrive protection prevents excessive negative current
flow
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options are available)
• Remote sense for the output voltage compensates for
output distribution drops
• Output voltage trim down to 6.0V permits custom voltages and voltage margining (+5%/-50%)
• Short startup inhibit time
Doc.# 005-2BH612M Rev. B
09/02/05
Page 1
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
MECHANICAL DIAGRAM
Open-Frame Version
1.90
1.400
(48.2)
(35.56)
1.000
(25.40)
1.55
0.31
(39.3)
(8.0)
0.85
0.700
(21.5)
(17.78)
0.400
0.50
(10.16)
(12.6)
0.11
(2.9)
2.30
(58.4)
Bottom View
Top View
1.90
(48.3)
Each exposed copper staple connected
to adjacent pin 5 and 9. See Note 7
0.400
0.19
0.50
(4.8)
(12.7)
(10.16)
0.422 + 0.030
(10.72 + 0.76)
1.400
(35.56)
2.40
(61.0)
Side View
NOTES
0.145
1) Pins 1, 2, 4, 6-8 are 0.040” (1.02mm) diameter with 0.080”
(2.03mm) diameter standoff shoulders.
2) Pins 5 and 9 are 0.080” (2.03 mm) diameter shoulderless pins.
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 - 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) Same net copper planes recommended on customer board in designated
areas adjacent to pins 5 and 9, as worst case bottom side clearance
could cause exposed copper staple to touch customer board surface.
8) Weight: 2.6 oz. (75g) typical
9) Workmanship: Meets or exceeds IPC-A-610C Class II
10) UL/TUV standards require a clearance greater than 0.04”
(1.02mm) between input and output for Basic insulation. This issue
should be considered if any copper traces are on the top side of
the user’s board. Note that the ferrite cores are considered part of
the input/primary circuit.
Product # BQ60120HEA30
Phone 1-888-567-9596
Customer Board
Lowest
Component
0.010+/-0.009
(0.25+/-0.22)
(3.68)
See Note 3
Bottom side
Clearance
See Note 10
PIN DESIGNATIONS
Pin No. Name
Function
1
Vin(+)
Positive input voltage
2
ON/OFF
TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
4
Vin(-)
Negative input voltage
5
Vout(-)
Negative output voltage
6
SENSE(-)
Return remote sense
7
TRIM
Output voltage trim
8
SENSE(+)
Positive remote sense
9
Vout(+)
Positive output voltage
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 2
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
MECHANICAL DIAGRAM
Baseplated Version
2.40
(61.0)
Bottom View
1.400
(35.56)
Bottom view is identical to openframe version shown on Page 2.
1.000
(25.40)
M3 Threaded Insert
4 Places
See Note 1 & 2
0.700
(17.78)
0.400
(10.16)
0.300
(7.62)
Side View
2.30
0.506 + 0.030
(12.85 + 0.76)
0.20
(58.4)
(5.1)
Top View
1.90
(48.3)
1.90
(48.3)
0.19
Customer Board
(4.8)
Lowest
Component
0.010 +.009
0.145
(.25 +.22)
(3.68)
See Note 6
Bottom side
Clearance
0.50
(12.7)
0.400
0.20
(10.16)
Pin farside
typical
(5.1)
1.400
(35.56)
2.000
(50.80)
NOTES
PIN DESIGNATIONS
1) M3 screws used to bolt unit’s baseplate to other surfaces (such
as heatsink) must not exceed 0.100” (2.54 mm) depth below
the surface of the baseplate.
2) Applied torque per screw should not exceed 6in-lb. (0.7 Nm)
3) Baseplate flatness tolerance is 0.004” (.10mm) TIR for surface
4) Pins 1, 2, 4, 6-8, are 0.040” (1.02mm) diameter with 0.080”
(2.03mm) diameter standoff shoulders
5) Pins 5, 9 are 0.080” (2.03mm) diameter shoulderless pins.
6) Other pin extension lengths available
7) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
8) Undimensioned components are shown for visual
reference only.
9) Weight: 4.3 oz. (123 g) typical
10) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
11) Workmanship: Meets or exceeds IPC-A-610C Class II
Pin connections are identical to open-frame version
shown on Page 2. Use “B” as 10th letter in part
number for baseplated version (see ordering page).
Product # BQ60120HEA30
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 3
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
BQ60120HEA30 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units
100
80
100
2250
100
125
V
V
V
V
°C
°C
Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Maximum Input Current
No-Load Input Current
Disabled Input Current
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (C1\L\C2)
Output Filter Component Values (Lout\Cout)
Recommended External Input Capacitance
Recommended External Input Capacitor ESR1
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Start-up Output Voltage Overshoot (with max. cap.)
Recommended External Output Capacitance
-40
-55
35
48
75
V
31.5
29.5
33.5
30.5
3.0
34.4
32.4
V
V
V
A
mA
mA
mA
mA
A
µF\µH\µF
nH\µF
µF
140
30
20
130
100
0.04
11.88
11.75
0
34
0.8
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
For a Step Change in Output Current (5A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Period
EFFICIENCY
100% Load
50% Load
8
2
20
0\1.0\5.0
100\90
100
0.2
1.5
12.00
12.12
+0.05 \ 6 +0.1 \ 12
+0.1 \ 12 +0.2 \ 24
+45
+90
12.33
V
%\mV
%\mV
mV
V
80
dB
120 Hz; Figure 22
300
500
100
mV
mV
µs
50% to 75% to 50% Iout max; Figure 13
50% to 75% to 50% Iout max; Figure 14
To within 1% Vout nom
ms
ms
Full load, Vout=90% nom.; Figures 11 & 12
%
%
Figures 1 - 6
Figures 1 - 6
°C
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 7 - 10 for derating curves
Applies to BQ60120HEB30 only
37
1.8
0.3
0
14
3
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature Limit
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance
RMS thru inductor; Figures 15 & 17
RMS; Figures 15 & 16
Fast blow external fuse recommended
Internal values; see Figure D
Internal values; see Figure D
Typical ESR 0.2Ω; see Figure 15
100kHz, -40°C to 100°C
mV
mV
A
A
A
A
µF
%
µF
60
20
120
40
30
40
3.2
0.6
>10,000
20
4
95
95
ISOLATION CHARACTERISTICS
Ω
100% Load, 35 Vin, trimmed up 5%
Over sample, line, load, temperature & life
44µF local ceramic, Figures 15 & 18
Full Load; Figures 15 & 18
Full Load; Figures 15 & 18
Subject to thermal derating; Figures 7 - 10
Output Voltage 10% Low; Figure 19
Negative current drawn from output
Negative current drawn from output
12Vout at 30A resistive load
10,000µF, Iout=30A resistive load
Local ceramic
44
DYNAMIC CHARACTERISTICS
11.6
180
50
40
Continuous
Continuous
100ms transient, square wave
Basic insulation level, Pollution degree 2
See Figures 7 - 10 for derating
125
125
125
100
2250
30
1000
V
MΩ
pF
1. Electrolytic capacitor ESR tends to increase dramatically at low temperature.
Product # BQ60120HEA30
Phone 1-888-567-9596
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Doc.# 005-2BH612M Rev. B
09/02/05
Page 4
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Switching Frequency Regulation Stage
Switching Frequency Isolation Stage
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Voltage Trim Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
Min.
Typ.
Max.
Units
270
135
300
150
330
165
kHz
kHz
-2
3.5
0.8
18
V
V
2.7
-2
18
0.8
V
V
6
V
kΩ
%
%
°C
°C
4.5
-50
113
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
5
10
118
120
10
600
+5
123
Notes & Conditions
Synchronous to regulation stage
Figure A
Measured across Pins 9 & 5; Figure B
Over full temp range; % of nominal Vout
Average PCB Temperature
See App Note: Output Load Current Calc.
10 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
106 Hrs. See our website for details
6
1.9
1.4
STANDARDS COMPLIANCE
Parameter P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1
EN60950-1
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
GR-1089-CORE
Telcordia (Bellcore) GR-513
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
Section 7 - electrical safety, Section 9 - bonding/grounding
• An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety
certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in z axis
-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003
• Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact factory for official product family qualification document.
OPTIONS
PATENTS
SynQor provides various options for Logic Sense, Pin Length and
Feature Set for this family of DC/DC converters. Please consult the
last page of this specification sheet for information on available
options.
SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417; 6,222,742 B1; 6,594,159
B2; 6,545,890 B2.
Product # BQ60120HEA30
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 5
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
22
100
20
95
Power Dissipation (W)
18
Efficiency (%)
90
85
80
35 Vin
75
48 Vin
75 Vin
16
14
12
10
8
6
35 Vin
4
48 Vin
2
75 Vin
0
70
0
3
6
9
12
15
18
21
24
27
0
30
3
6
9
Load Current (A)
12
15
18
21
24
27
30
Load Current (A)
Figure 1: Efficiency at nominal 12V output vs. load current for minimum, nominal, and maximum input voltage at 25°C.
Figure 2: Power dissipation at nominal 12V output vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
22
100
20
18
Power Dissipation (W)
Efficiency (%)
95
90
85
80
14
12
10
8
6
35 Vin
35 Vin
75
16
4
48 Vin
48 Vin
2
75 Vin
70
75 Vin
0
0
3
6
9
12
15
18
21
24
27
30
0
3
6
9
Load Current (A)
12
15
18
21
24
27
30
Load Current (A)
Figure 3: Efficiency at trimmed-down 9.0V output vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Figure 4: Power dissipation at trimmed-down 9.0V output vs. load current for minimum, nominal, and maximum input voltage at 25°C.
22
100
20
18
Power Dissipation (W)
Efficiency (%)
95
90
85
80
16
14
12
10
8
6
35 Vin
35 Vin
75
48 Vin
75 Vin
4
48 Vin
2
75 Vin
0
70
0
3
6
9
12
15
18
21
24
27
0
30
Load Current (A)
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6
9
12
15
18
21
24
27
30
Load Current (A)
Figure 5: Efficiency at trimmed-down 6.0V output vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Product # BQ60120HEA30
3
Figure 6: Power dissipation at trimmed-down 6.0V output vs. load current for minimum, nominal, and maximum input voltage at 25°C.
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 6
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
30
Semiconductor junction temperature is
within 1°C of surface temperature
25
Iout (A)
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
5
100 LFM (0.5 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 25 amp load current (300W)
with 55°C air flowing at the rate of 200 LFM. Air is flowing across the
converter from input to output (nominal input voltage).
30
Semiconductor junction temperature is
within 1°C of surface temperature
25
Iout (A)
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
5
100 LFM (0.5 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 9: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin 1 to pin 4 (nominal input voltage).
Figure 10: Thermal plot of converter at 24.5 amp load current (294W)
with 55°C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 1 to pin 4 (nominal input voltage).
Figure 11: Turn-on transient at full load (resistive load) (10 ms/div).
Input voltage pre-applied. Top Trace: Vout (5V/div). Bottom Trace:
ON/OFF input (5V/div)
Figure 12: Turn-on transient at zero load (10 ms/div). Top Trace: Vout
(5V/div). Bottom Trace: ON/OFF input (5V/div).
Product # BQ60120HEA30
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Doc.# 005-2BH612M Rev. B
09/02/05
Page 7
Input:
Output:
Current:
Package:
Technical Specification
Figure 13: Output voltage response to step-change in load current (50%75%-50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 47µF ceramic cap.
Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
35-75 V
12 V
30 A
Half-brick
Figure 14: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 15 mΩ ESR tantalum cap
and 47µF ceramic cap. Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
See Fig. 17
4.7 µH
source
impedance
See Fig. 16
See Fig. 18
iS
VSOURCE
iC
100 µF,
ESR ≅0.2Ω
electrolytic
capacitor
DC/DC
Converter
VOUT
2x22 µF
local ceramic
capacitance
1 µF ceramic,
15 µF tantalum
Figure 15: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 16), Input Reflected Ripple Current
(Figure 17) and Output Voltage Ripple (Figure 18).
Figure 16: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 4.7µ H source impedance and
100µ F electrolytic capacitor (100 mA/div). (See Figure 15)
Figure 17: Input reflected ripple current, is, through a 4.7 µ H source
inductor at nominal input voltage and rated load current (10 mA/div).
(See Figure 15)
Figure 18: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 2x22µ F ceramic capacitor.
Bandwidth: 500 MHz. (See Figure 15)
Product # BQ60120HEA30
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Doc.# 005-2BH612M Rev. B
09/02/05
Page 8
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
16
OVP Shutdown
Output Voltage (V)
14
12
10
8
6
4
35 - 75 Vin
2
0
-5
0
5
10
15
20
25
30
35
40
45
Load Current (A)
Figure 19: Output voltage vs. load current showing typical current limit
curves and OVP shutdown point.
Figure 20: Load current (10A/div) as a function of time when the converter attempts to turn on into a 1 mΩ short circuit.
1
0
0.1
35 Vin
0.01
48 Vin
75 Vin
0.001
Forward Transmission (dB)
Output Impedance (Ω
Ω)
-10
-20
-30
-40
-50
35 Vin
-60
48 Vin
75 Vin
-70
-80
-90
-100
0.0001
-110
100
1,000
10,000
100,000
100
1,000
Hz
Figure 21: Magnitude of incremental output impedance (Zout =
vout/iout) for minimum, nominal, and maximum input voltage at full
rated power.
100,000
Figure 22: Magnitude of incremental forward transmission (FT =
vout/vin) for minimum, nominal, and maximum input voltage at full
rated power.
20
100
10
0
35 Vin
-10
48 Vin
75 Vin
-20
Input Impedance (Ω
Ω)
Reverse Transmission (dB)
10,000
Hz
10
35 Vin
1
48 Vin
75 Vin
0.1
-30
-40
100
0.01
1,000
10,000
100,000
100
Figure 23: Magnitude of incremental reverse transmission (RT =
iin/iout) for minimum, nominal, and maximum input voltage at full rated
power.
Product # BQ60120HEA30
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1,000
10,000
100,000
Hz
Hz
Figure 24: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input voltage at full rated power.
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 9
Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The BusQor Exa series converter uses a two-stage power conversion topology. The first stage keeps the output voltage constant
over variations in line, load, and temperature. The second stage
uses a transformer to provide the functions of input/output isolation and voltage step-down to achieve the low output voltage
required.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is
referenced to the return terminal of the input bus, Vin(-). There are
two versions of the converter that differ by the sense of the logic
used for the ON/OFF input.
Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous rectifiers.
These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This is the
primary reason that the BusQor converter has such high efficiency.
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter on). In the negative logic
version, the ON/OFF signal is active low (meaning that a low
turns the converter on). Figure A details five possible circuits for
driving the ON/OFF pin.
REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not required,
the BusQor converter does not need a metal baseplate or potting
material to help conduct the dissipated energy to the heatsink.
The BusQor converter can thus be built more simply and reliably
using high yield surface mount techniques on a PCB substrate.
Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is
desired. If these connections are not made, the converter will
deliver an output voltage that is slightly lower than its specified
value.
The BusQor series of half-brick, quarter-brick and eighth-brick
converters uses the industry standard footprint and pin-out configuration.
Note: the output over-voltage protection circuit senses the voltage
across the sense leads (pins 8 and 6) to determine when it should
trigger, not the voltage across the converter’s output pins (pins 9
and 5).
OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications. SynQor uses
industry standard trim equations.
ON/OFF
ON/OFF
ON/OFF
To decrease the output voltage, the user should connect a resistor
between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease
of the nominal output voltage, the value of the resistor should be
Rtrim-down =
Remote Enable Circuit
Vin(_)
Vin(_)
Vin(_)
Negative Logic
(Permanently Enabled)
ON/OFF
TTL/
CMOS
ON/OFF
∆% =
Vnominal – Vdesired
Vnominal
x 100%
To increase the output voltage, the user should connect a resistor
between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be
Vin(_)
Vin(_)
Open Collector Enable Circuit
where
Positive Logic
(Permanently Enabled)
5V
- 2 kΩ
(100%
∆ )
Direct Logic Drive
Rtrim-up =
nominal – 2
(V1.225
)xV
DES
+ VNOM
VDES - VNOM
kΩ
Figure A: Various circuits for driving the ON/OFF pin.
Product # BQ60120HEA30
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09/02/05
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Input:
Output:
Current:
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Technical Specification
Figure B graphs the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
0
5
10
15
20
25
30
35
40
45
50
10,000.0
Trim Resistance (kOhms)
1,000.0
100.0
10.0
constant output current. There is no minimum operating output
voltage. The converter will run with low on-board power dissipation down to zero output voltage. A redundant circuit will shutdown the converter if the primary current limit fails.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the "Back-Drive Current Limit while
Enabled" specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the "Output OverVoltage Protection" threshold*, then the unit will shut down. The
full I-V output characteristic can be seen in Figure 19.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the “Output Over-Voltage Protection” threshold*,
the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a
release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions.
1.0
0.1
0.0
% Increase in Vout
35-75 V
12 V
30 A
Half-brick
% Decrease in Vout
Figure B: Trim Graph for 12Vout module
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally filtered to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout,
due to both trimming and remote load voltage drops, should not
be greater than that specified for the output voltage trim range.
PROTECTION FEATURES
Over-Temperature Shutdown: A temperature sensor on the
converter senses the average temperature of the module. The
thermal shutdown circuit is designed to turn the converter off
when the temperature at the sensed location reaches the OverTemperature Shutdown value. It will allow the converter to turn on
again when the temperature of the sensed location falls by the
amount of the Over-Temperature Shutdown Restart Hysteresis
value.
Start-up Inhibit Period: If any protection feature causes the
converter to shut down, the converter will attempt to restart after
2ms (typical), the "Startup Inhibit Period".* On initial application of input voltage, with the on/off pin set to enable the converter, the "Turn-On Time"* will increase by only 2ms.
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the application note titled “Input System Instability” available on the
SynQor website. The lockout circuitry is a comparator with DC
hysteresis. When the input voltage is rising, it must exceed the
typical “Turn-On Voltage Threshold” value* before the converter
will turn on. Once the converter is on, the input voltage must fall
below the typical Turn-Off Voltage Threshold value before the
converter will turn off.
Output Current Limit: If the output current exceeds the
"Output DC Current Limit Inception" point*, then a fast linear current limit controller will reduce the output voltage to maintain a
* See specification page.
Product # BQ60120HEA30
Phone 1-888-567-9596
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09/02/05
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Input:
Output:
Current:
Package:
Technical Specification
APPLICATION CONSIDERATIONS
Input System Instability: This condition can occur because
any DC/DC converter appears incrementally as a negative
resistance load. A detailed application note titled “Input
System Instability” is available on the SynQor website
(www.synqor.com) which provides an understanding of why
this instability arises, and shows the preferred solution for correcting it.
Application Circuits: Figure C below provides a typical circuit diagram which details the input filtering and voltage trimming.
35-75 V
12 V
30 A
Half-brick
minimum external output capacitance is required, as specified in
the Output Characteristics section on the Electrical Specifications
page. No damage will occur without this capacitor connected,
but peak output voltage ripple will be much higher.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium,
Hexavalent Chromium, Mercury, Polybrominated Biphenyls
(PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical
and Electronic Equipment. SynQor products are currently 5/6
RoHS compliant with lead being the exception. For more information please visit our RoHS Compliance / Lead Free Initiative
web or e-mail us at [email protected].
Input Filtering and External Input Capacitance: Figure D
below shows the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise
could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is specified in
the “Input Characteristics” section. More detailed information is
available in the application note titled “EMI Characteristics” on
the SynQor website.
Output Filtering and External Output Capacitance:
Figure D below shows the internal output filter components. This
filter dramatically reduces output voltage ripple. However, some
2 x 22µF
local ceramic
Electrolytic
Capacitor
External
Input
Filter
Vin
Vout(+)
Vin(+)
Vsense(+)
100µF
ESR ≅ 0.2Ω
ON/OFF
Trim
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure C: Typical application circuit (negative logic unit, permanently enabled).
Lin
Lout /2
Vin(+)
Vout(+)
C1
C2
Regulation
Stage
Isolation
Stage
Cout
Current
Sense
Vin(_)
Lout /2
Vout(_)
Figure D: Internal Input and Output Filter Diagram (component values listed on the specifications page).
Product # BQ60120HEA30
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Input:
Output:
Current:
Package:
Technical Specification
35-75 V
12 V
30 A
Half-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s BusQor DC/DC converters follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
BQ 60 120 H E A 30 N N S
Options (see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Model Number
Input Voltage
BQ60120HEw25xyz
BQ60120HEw30xyz
35 - 75 V
35 - 75 V
Output Max Output
Voltage Current
12 V
25 A
12 V
30 A
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Output Voltage
Input Voltage
Product Family
Options Description: w x y z
Thermal
Design
The first 12 characters comprise the base part number and the
last 3 characters indicate available options. Although there
are no default values for enable logic, pin length, and feature
set, the most common options are negative logic, 0.145” pins
and standard feature set. These part numbers are more likely to be readily available in stock for evaluation and prototype
quantities.
Enable
Logic
Pin
Length
Feature
Set
K - 0.110"
A - Open Frame P - Positive N - 0.145"
S - Standard
B - Baseplated N - Negative R - 0.180"
Y - 0.250"
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ60120HEA30
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 13
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