MIL-PRF-38534 CERTIFIED FACILITY
M.S.KENNEDY CORP.
20W
DC-DC
CONVERTERS
4707 Dey Road Liverpool, N.Y. 13088
BBF2800S
SERIES
(315) 701-6751
FEATURES:
All Ceramic Capacitors
Surface Mount Magnetics
MIL STD 461C CR03 (DC-DC Converters)
80 Volt Input Transient Tolerent
Wide Supply Range - 16V to 50V
High Isolation - 500V
High Power Density - 17W/in³
Output Voltage Adjustment - Standard
Remote Shutdown
Operates to 14V Input at 10W
Available with 3.3V, 5V, 12V and 15V Outputs
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The BBF2800S series of DC-DC converters provides the ruggedness, reliability and features required to
meet the advanced design challenges of today's hi-rel market. This has been accomplished using a package
having very low thermal gradients, excellent hermeticity and high voltage isolation. The use of advanced substrate
and reflow soldering techniques during construction results in a rugged, cost-effective pin solderable package.
The BBF2800S hybrid converter series utilizes all ceramic capacitors and surface mount magnetics to provide
reliable operation at all operating temperatures while surviving very high G forces.
BBF2800S series standard features include kelvin sense, indefinite short circuit protection, remote shutdown,
output fault monitoring, turn on voltage point adjustment, switching frequency synchronization of up to 3 units using
no external components and pi-network input filtering. An output voltage adjustment/load compensation pin is also
standard.
Fault tolerance design protects these converters from most external circuit faults. The output and output adjust
pins will withstand +35V while the shutdown and all synchronization pins will withstand +50V protecting the
converters from a variety of system or board faults, i.e. solder bridges, etc. Unique load fault protection circuitry
allows this converter to pull up loads having difficult static load line characteristics and allows short term load
excursions significantly beyond ratings in most applications.
The BBF2800 series is a current mode push-pull topology converter which operates at a switching frequency of
500KHz. Internal filtering of both input and output eliminates the need for external capacitors in many applications.
The 12-pin power dip package allows connection to a heatsink and is hermetically sealed and isolated from the
internal circuits.
1
8548-34 Rev. H 4/12
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
5
6
Isolated Step Down Power Supply
Microprocessor Power Source
Low Voltage Subsystem Power Source
+Input
Shutdown Plus
Clock
Adjust/Comp
-Output
+Output
-Input
Timing 2
Timing 1
Case
-Sense
+Sense
12
11
10
9
8
7
ABSOLUTE MAXIMUM RATINGS
TST Storage Temperature Range
TLD Lead Temperature Range
(10 Seconds)
PD Power Dissipation
TJ Junction Temperature
θJC Thermal Resistance
(Switches)
+50V
VIN Input Voltage (pin 7 to pin 6)
Input
Transient
(pin
7
to
pin
6
@
50mS)
80V
VINT
1
Output
Current
IOUT
BBF2803S
5.5A
BBF2805S
4.0A
BBF2812S
1.9A
BBF2815S
1.5A
Case
Temperature
Range
TC
BBF2800S H
-55°C to +125°C
BBF2800S
-40°C to +85°C
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-65°C to +150°C
300°C
See Efficiency Curve
150°C
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6.5°C/W
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NOTES:
1 Continuous operation above the absolute maximum ratings may adversly effect the device performance and/or life cycle.
2
8548-34 Rev. H 4/12
ELECTRICAL SPECIFICATIONS
BBF2803S
Group A
Subgroup
Test Conditions 1
Parameter
Line Regulation
Step Load Recovery 2
Step Line Response 2
Step Line Recovery 2
Start Up Overshoot
Start Up Delay
2
3.18
3.30
3.42
VDC
3.45
-
-
-
VDC
1
500
-
5500
500
-
5500
mA
2,3
500
-
5500
-
-
-
mA
1
-
20
50
-
20
60
mVrms
2,3
-
-
60
-
-
-
mVrms
1
-
20
50
-
20
60
mArms
2,3
-
-
60
-
-
-
mArms
1
-
±2
±20
-
±2
±25
mV
2,3
-
-
±50
-
-
-
mV
1
-
±1
±15
-
±1
±20
mV
2,3
-
-
±40
-
-
-
mV
1
61
66
-
61
66
-
%
2,3
58
-
-
-
-
-
%
IOUT=2.75A to/from 5.50A
4
-
±400
±600
-
±400
±700
mV
BW=10KHz to 2MHz
Transition TIme=30μS
5,6
-
-
±800
-
-
-
mV
IOUT=2.75A to/from 5.50A
4
-
100
200
-
100
220
μS
Transition TIme=30μS
5,6
-
-
300
-
-
-
μS
VIN=16V to/from 40V
4
-
±500
±750
-
±500
±800
mV
Transition Time=30μS
5,6
-
-
±1000
-
-
-
mV
VIN=16V to/from 40V
4
-
80
200
-
80
220
μS
Transition Time=30μS
5,6
-
-
300
-
-
-
μS
4
-
0
300
-
0
300
mV
5,6
-
-
500
-
-
-
mV
4
-
30
60
-
30
60
mS
5,6
-
-
100
-
-
100
mS
4
-
120
500
-
120
500
μS
5,6
-
-
550
-
-
-
μS
-
-
20
60
-
20
60
mS
1,2,3
16
-
40
16
-
40
V
1
-
35
40
-
35
40
mA
IOUT=5.5A
IOUT=5.5A
Shutdown Recovery 2
Quiescent Current
Capacitive Load 2
Isolation
Max.
3.40
Shutdown Delay 2
Input Voltage Range 2
Typ.
-
Efficiency
2
Min.
3.30
IOUT=0.5A to 5.5A
Step Load Response
Max.
3.15
VIN=16V to 40V
Load Regulation
Typ.
3.20
BW=10KHz to 2MHz
Input Current Ripple 2
Units
Min.
1
16V≤VIN≤40V
Output Voltage Ripple
BBF2803S
2,3
Output Voltage
Output Current 2 8
BBF2803S H
POUT=18W MAX.
Enabled, IOUT=0mA
2,3
-
-
50
-
-
-
mA
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
mA
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
μF
Input to output or any pin to case @ 500V
1
100
-
-
100
-
-
MΩ
Short Circuit Current Limit 7
1
5.5
7.8
8.5
5.5
7.8
8.5
A
Switching Frequency
4
475
500
525
475
500
525
KHz
1
±10
-
-
±10
-
-
%
VOUT Adjustment Range
RPOT=50KΩ
NOTES:
+VIN = 28V, IOUT = 5.5A, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
8 At case temperatures above 90°C, the BBF2803 requires VIN>16V to support a 5.5A load. At 125°C, 18V input is required
to support 5.5A output; 16V will support 4A output at 125°C.
1
2
3
4
5
6
3
8548-34 Rev. H 4/12
ELECTRICAL SPECIFICATIONS
BBF2805S
Group A
Subgroup
Test Conditions 1
Parameter
Step Load Recovery
2
Step Line Response 2
Step Line Recovery 2
4.95
5.05
5.15
VDC
5.20
-
-
-
VDC
1
400
-
4000
400
-
4000
mA
2,3
400
-
4000
-
-
-
mA
1
-
20
50
-
20
60
mVrms
2,3
-
-
60
-
-
-
mVrms
1
-
20
50
-
20
60
mArms
2,3
-
-
60
-
-
-
mArms
1
-
±5
±25
-
±5
±50
mV
2,3
-
-
±50
-
-
-
mV
1
-
±2
±25
-
±2
±50
mV
2,3
-
-
±50
-
-
-
mV
1
65
72
-
65
72
-
%
2,3
58
-
-
-
-
-
%
IOUT=2A to/from 4A
4
-
±700
±1000
-
±700
±1200
mV
Transition TIme=30μS
5,6
-
-
±1500
-
-
-
mV
IOUT=2A to/from 4A
4
-
100
200
-
100
220
μS
Transition TIme=30μS
5,6
-
-
300
-
-
-
μS
VIN=16V to/from 40V
4
-
±500
±800
-
±500
±900
mV
Transition Time=30μS
5,6
-
-
±1100
-
-
-
mV
VIN=16V to/from 40V
4
-
80
200
-
80
220
μS
Transition Time=30μS
5,6
-
-
300
-
-
-
μS
4
-
0
400
-
0
400
mV
5,6
-
-
800
-
-
-
mV
4
-
30
60
-
30
60
mS
5,6
-
-
100
-
-
100
mS
4
-
120
500
-
120
500
μS
5,6
-
-
550
-
-
-
μS
-
-
20
60
-
20
60
mS
1,2,3
16
-
40
16
-
40
V
1
-
35
40
-
35
40
mA
IOUT=4.0A
Start Up Overshoot
Start Up Delay
2
IOUT=4.0A
Shutdown Delay 2
Shutdown Recovery 2
Input Voltage Range 2
POUT=20W MAX.
Enabled, IOUT=0mA
Quiescent Current
Capacitive Load 2
Isolation
Short Circuit Current Limit
2,3
-
-
50
-
-
-
mA
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
mA
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
μF
Input to output or any pin to case @ 500V
1
100
-
-
100
-
-
MΩ
7
Switching Frequency
VOUT Adjustment Range
Max.
5.10
Efficiency
2
Typ.
-
IOUT=0.4A to 4.0A
Step Load Response
Min.
5.05
VIN=16V to 40V
Load Regulation
Max.
4.90
BW=10KHz to 2MHz
Line Regulation
Typ.
5.00
BW=10KHz to 2MHz
Input Current Ripple 2
Units
Min.
1
16V≤VIN≤40V
Output Voltage Ripple
BBF2805S
2,3
Output Voltage
Output Current 2
BBF2805S H
RPOT=50KΩ
1
4.0
6.0
7.0
4.0
6.0
7.0
A
4
475
500
525
475
500
525
KHz
1
±10
-
-
±10
-
-
%
NOTES:
+VIN = 28V, IOUT = 4.0A, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
1
2
3
4
5
6
4
8548-34 Rev. H 4/12
ELECTRICAL SPECIFICATIONS
BBF2812S
Group A
Subgroup
Test Conditions 1
Parameter
Step Line Response 2
Step Line Recovery 2
11.95
12.05
12.15
VDC
12.30
-
-
-
VDC
1
190
-
1900
190
-
1900
mA
2,3
190
-
1800
-
-
-
mA
1
-
25
50
-
25
60
mVrms
2,3
-
-
60
-
-
-
mVrms
1
-
20
40
-
20
40
mArms
2,3
-
-
50
-
-
-
mArms
1
-
±5
±50
-
±5
±60
mV
2,3
-
-
±100
-
-
-
mV
1
-
±5
±50
-
±5
±60
mV
2,3
-
-
±100
-
-
-
mV
1
67
74
-
67
74
-
%
2,3
58
-
-
-
-
-
%
IOUT=0.95A to/from 1.9A
4
-
±700
±1200
-
±700
±1400
mV
Start Up Delay
Transition TIme=30μS
5,6
-
-
±1600
-
-
-
mV
IOUT=0.95A to/from 1.9A
4
-
100
200
-
100
220
μS
Transition TIme=30μS
5,6
-
-
300
-
-
-
μS
VIN=16V to/from 40V
4
-
±300
±500
-
±300
±550
mV
Transition Time=30μS
5,6
-
-
±800
-
-
-
mV
VIN=16V to/from 40V
4
-
70
200
-
70
220
μS
Transition Time=30μS
5,6
-
-
300
-
-
-
μS
4
-
0
400
-
0
500
mV
5,6
-
-
1500
-
-
-
mV
4
-
20
60
-
20
60
mS
5,6
-
-
100
-
-
-
mS
4
-
120
500
-
120
500
μS
5,6
-
-
550
-
-
-
μS
-
-
20
60
-
20
60
mS
1,2,3
16
-
40
16
-
40
V
1
-
35
40
-
35
40
mA
IOUT=1.9A
Start Up Overshoot
IOUT=1.9A
2
Shutdown Delay 2
Shutdown Recovery 2
Input Voltage Range 2
POUT=22.8W MAX.
Enabled, IOUT=0mA
Quiescent Current
Capacitive Load 2
Isolation
Short Circuit Current Limit
2,3
-
-
50
-
-
-
mA
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
mA
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
μF
Input to output or any pin to case @ 500V
1
100
-
-
100
-
-
MΩ
7
Switching Frequency
VOUT Adjustment Range
Max.
12.10
Efficiency
Step Load Recovery 2
Typ.
-
IOUT=0.19A to 1.9A
Step Load Response 2
Min.
12.05
VIN=16V to 40V
Load Regulation
Max.
11.80
BW=10KHz to 2MHz
Line Regulation
Typ.
12.00
BW=10KHz to 2MHz
Input Current Ripple 2
Units
Min.
1
16V≤VIN≤40V
Output Voltage Ripple
BBF2812S
2,3
Output Voltage
Output Current 2
BBF2812S H
RPOT=50KΩ
1
1.9
2.8
3.4
1.9
2.8
3.4
A
4
475
500
525
475
500
525
KHz
1
±10
-
-
±10
-
-
%
NOTES:
+VIN = 28V, IOUT = 1.9A, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
1
2
3
4
5
6
5
8548-34 Rev. H 4/12
ELECTRICAL SPECIFICATIONS
BBF2815S
Group A
Subgroup
Test Conditions 1
Parameter
Step Load Recovery 2
Step Line Response
2
Step Line Recovery 2
14.95
15.10
15.25
VDC
15.40
-
-
-
VDC
1
150
-
1500
150
-
1500
mA
2,3
150
-
1400
-
-
-
mA
1
-
25
50
-
25
60
mVrms
2,3
-
-
60
-
-
-
mVrms
1
-
20
40
-
20
40
mArms
2,3
-
-
50
-
-
-
mArms
1
-
±10
±50
-
±10
±60
mV
2,3
-
-
±125
-
-
-
mV
1
-
±20
±50
-
±20
±60
mV
2,3
-
-
±125
-
-
-
mV
1
68
73
-
68
73
-
%
2,3
58
-
-
-
-
-
%
IOUT=0.75A to/from 1.50A
4
-
±800
±1200
-
±800
±1400
mV
Start Up Delay
Transition TIme=30μS
5,6
-
-
±1700
-
-
-
mV
IOUT=0.75A to/from 1.50A
4
-
100
200
-
40
220
μS
Transition TIme=30μS
5,6
-
-
300
-
-
-
μS
VIN=16V to/from 40V
4
-
±300
±500
-
±300
±550
mV
Transition Time=30μS
5,6
-
-
±800
-
-
-
mV
VIN=16V to/from 40V
4
-
80
200
-
80
220
μS
Transition Time=30μS
5,6
-
-
300
-
-
-
μS
4
-
0
400
-
0
500
mV
5,6
-
-
1500
-
-
-
mV
4
-
20
60
-
20
60
mS
5,6
-
-
100
-
-
-
mS
4
-
120
500
-
120
500
μS
5,6
-
-
550
-
-
-
μS
-
-
20
60
-
30
60
mS
1,2,3
16
-
40
16
-
40
V
1
-
35
40
-
35
40
mA
IOUT=1.5A
Start Up Overshoot
IOUT=1.5A
2
Shutdown Delay 2
Shutdown Recovery 2
Input Voltage Range 2
POUT=22.5W MAX.
Enabled, IOUT=0mA
Quiescent Current
Capacitive Load 2
Isolation
Short Circuit Current Limit
2,3
-
-
50
-
-
-
mA
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
mA
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
μF
Input to output or any pin to case @ 500V
1
100
-
-
100
-
-
MΩ
7
Switching Frequency
VOUT Adjustment Range
Max.
15.20
Efficiency
2
Typ.
-
IOUT=0.15A to 1.5A
Step Load Response
Min.
15.10
VIN=16V to 40V
Load Regulation
Max.
14.80
BW=10KHz to 2MHz
Line Regulation
Typ.
15.00
BW=10KHz to 2MHz
Input Current Ripple 2
Units
Min.
1
16V≤VIN≤40V
Output Voltage Ripple
BBF2815S
2,3
Output Voltage
Output Current 2
BBF2815S H
RPOT=50KΩ
1
1.5
2.4
3.0
1.5
2.4
3.0
A
4
475
500
525
475
500
525
KHz
1
±10
-
-
±10
-
-
%
NOTES:
+VIN = 28V, IOUT = 1.5A, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
1
2
3
4
5
6
6
8548-34 Rev. H 4/12
APPLICATION NOTES
POWER SUPPLIES
MULTIPLE CONVERTER SYNCHRONIZATION
The output voltage of the BBF2800S may be adjusted from
90% to 110% of nominal value by the use of a 50KΩ potentiometer as shown. Adjustment beyond this range is possible
however certain characteristics of the converter such as but
not limited to input voltage range, efficiency, ripple and temperature performance will change. Characterization by the user
is recommended in such applications.
Synchronized operation of up to three BBF2800S series converters may be accomplished without external components. One
unit selected to be the master is connected normally with pin
10 grounded. The clock output pin 3 will provide the sync signal for up to two slave units. The slave units have pin 10 not
connected and receive the clock signal into pin 11. The clock
signal lines may be shielded to prevent radiation. A separate 50
ohm coax to each slave unit is recommended in order to preserve signal integrity. Shield ends should be connected to pin
12 of the nearest converter.
BBF2800S converters may also be synchronized to an external 500 KHz (+/- 5%) frequency source driving pin 11 of the
converters. Pin 10 is not connected. The converters synchronize
to the positive edge of the frequency source allowing a variety
of wave forms (pulse, square, spike) to be used. Pin 11 is
internally capacitively coupled allowing unipolar or bipolar frequency sources to be used. The source should have a waveform
rise time of 20 ns or less and be capable of driving at least 4 volts
peak into each 50 ohm pin 11 input (50 volts peak max).
An externally synchronized unit may be used to synchronize
other (slave) units. The slave units may be used in turn to
synchronize other slave units from their pin 3 outputs. Each
“generation” of slave units has a delay (100-200ns typical) from
the unit that it is synchronizing to.
Adjust/comp (pin 4) may be driven by external circuitry referenced to pin 8 (-output sense) if desired. Grounding pin 4
causes output voltage to increase (25% typically) while driving
pin 4 above 1.3V causes output voltage to decrease. Pin 4
may be driven through 10KΩ or more if connection of the comp
function is also required.
The comp function of pin 4 allows transient response and
phase margin to be tailored to suit a specific application. This
feature may be utilized by connecting a small (1-500nF) capacitor between pins 4 and 6 or 7. This is generally recommended
when very large low ESR load capacitances are used.
SHUTDOWN PLUS
Pin 2 is used for remote shutdown, output fault detection,
and/or setting the input voltage point at which the converter
will turn on as shown in the typical application diagram. No
connection to pin 2 is necessary for normal operation of the
converter. Pin 2 is referenced to pin 12 (-input).
Shutdown may be implemented by simply connecting pin 2
to an open collector logic output or switch rated at 2.5mA,
25Vdc or higher.
Input voltage turn on point is programmed with a single resistor from pin 2 to 12. An input turn on/off hysteresis (typically
3.5% of Vin) will be observed. This should be considered when
making or verifying set point adjustment. The value of the
setpoint resistor may be determined by the following:
R= 210·10³
ETO-9.5
(±10% accuracy at 25°C)
Set point temperature coefficient is typically +400ppm/°C.
Output fault monitoring is accomplished by observing pin 2 with
a high impedance monitoring circuit. Pin 2 voltage drops from
over 10V to below 1V when a load fault causes the converters
fault protection circuitry to activate. It will remain low for at
least 100mS and return high. If the load fault is still present pin
2 will return low and the cycle will repeat. If there is no input
setpoint programming resistor already in place a resistor
>400KΩ from pin 2 to 12 will provide pin 2 pull down.
7
8548-34 Rev. H 4/12
TYPICAL APPLICATION CIRCUIT
The above diagram shows the remote sense feature which reduces Vo errors due to the resistance of the
conductors feeding the load. This diagram also shows the connections for non-synchronized operation
(TIMING 1 and 2) as well as output voltage trim, remote shutdown, fault monitoring, and input voltage turn
on point adjustment.
8
8548-34 Rev. H 4/12
TYPICAL PERFORMANCE CURVES
BBF2803S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
70%
25
20
12
10
0.0
2.0
4.0
6.0
OUTPUT CURRENT, IOUT (A)
IOUT
2.75A
INCLUDES 1000μF ON OUTPUT BUS
1V
VOUT
5.5A
2.75A
IOUT
NO OUTPUT BUS CAPCITANCE
VOUT
40V
16V
VIN
INCLUDES 100μF ON OUTPUT BUS
TURN ON RESPONSE
0
3.3V
VOUT
LOAD = 5.5A
0V
28V
VIN
0V
INCLUDES 100μF ON
OUTPUT BUS
TIME, t (5msec/DIV)
9
AUDIO REJECTION, AV (dB)
RESPONSE, X (UNITS/DIV)
10 V
2V
TURN ON VOLTAGE, ETO (V)
INCLUDES 100μF ON OUTPUT BUS
LOAD = 5.5A
TURN ON THRESHOLD
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, RSP (Ω)
2.75A
IOUT
TIME, t (200μsec/DIV)
28
16
VOUT
LINE TRANSIENT RESPONSE
TIME, t (200μsec/DIV)
20
64%
5.5A
TIME, t (100μsec/DIV)
TIME, t (500μsec/DIV)
24
69%
20
LOAD TRANSIENT RESPONSE 100μF
OUTPUT RESPONSE, X (UNITS/DIV)
10V
100mV
1V
2A
OUTPUT RESPONSE, X (UNITS/DIV)
5.5A
68%
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE 1000μF
VOUT
25
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, IOUT (A)
2A
14
OUTPUT RESPONSE, X (UNITS/DIV)
INPUT VOLTAGE, VIN (V)
16
OUTPUT DC
CURRENT RATING
TEMP = 25°C
18
67%
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, IOUT (A)
LOW LINE DROP OUT
20
66%
70%
67%
66%
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, IOUT (A)
TEMP = 125°C
30
1V
69%
20
30
40%
50%
60%
35
64%
2A
25
50%
TEMP =
54%
–55°C
58%
60%
62%
64%
65%
66%
35
EFFICIENCY CONTOURS
40
30%
40%
OUTPUT RESPONSE, X (UNITS/DIV)
68%
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
40%
50%
TEMP = 25°C
56%
35
60%
64%
66%
30
67%
INPUT VOLTAGE, VIN (V)
40
40
–20
AUDIO REJECTION
VIN = 28VDC
IOUT = 5.5 Amps
–40
–60
–80
–100
100 200 400 1K 2K
10K 20K
FREQUENCY, f (Hz)
100K
8548-34 Rev. H 4/12
TYPICAL PERFORMANCE CURVES
BBF2805S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
73%
16
.4
.8
1.6
2.4
3.2
OUTPUT CURRENT, IOUT (A)
25
12
10
0.0
1.0
2.0
3.0
4.0
5.0
OUTPUT CURRENT, IOUT (A)
2A
IOUT
INCLUDES 1000μF ON OUTPUT BUS
NO OUTPUT BUS CAPCITANCE
1V
67%
4
VOUT
4A
2A
IOUT
INCLUDES 100μF ON OUTPUT BUS
40V
16V
VIN
INCLUDES 100μF ON OUTPUT BUS
TURN ON RESPONSE
0
5.1V
VOUT
LOAD 4A
0V
28V
0V VIN
INCLUDES 100μF ON OUTPUT BUS
TIME, t (5msec/DIV)
10
AUDIO REJECTION, AV (dB)
RESPONSE, X (UNITS/DIV)
10 V
2V
TURN ON VOLTAGE, ETO (V)
73%
.8
1.6
2.4
3.2
OUTPUT CURRENT, IOUT (A)
LOAD 4A
TURN ON THRESHOLD
12
10K
20K 30K 40K50K 70K 90K
SET POINT RESISTOR, RSP (Ω)
72%
20
LOAD TRANSIENT RESPONSE 100μF
28
16
71%
25
VOUT
TIME, t (200μsec/DIV)
20
30
TEMP =
125°C
TIME, t (200μsec/DIV)
TIME, t (500μsec/DIV)
24
60%
64%
67%
69%
70%
LINE TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
10V
100mV
1V
1A
OUTPUT RESPONSE, X (UNITS/DIV)
4A
2A
IOUT
35
16
.4
4
VOUT
30%
50%
TIME, t (100μsec/DIV)
LOAD TRANSIENT RESPONSE 1000μF
VOUT
.8
1.6
2.4
3.2
OUTPUT CURRENT, IOUT (A)
4A
1A
14
71%
20
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
INPUT VOLTAGE, VIN (V)
16
OUTPUT DC
CURRENT RATING
TEMP = 25°C
18
TEMP =
–55°C
64%
66%
68%
69%
70%
30
LOW LINE DROP OUT
20
INPUT VOLTAGE, VIN (V)
35
15
4
50%
55%
60%
OUTPUT RESPONSE, X (UNITS/DIV)
20
EFFICIENCY CONTOURS
40
40%
1V
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
30%
40%
50%
35
TEMP = 25°C
60%
63%
66%
30
68%
70%
71%
25
72%
1A
40
40
–20
AUDIO REJECTION
VIN = 28VDC
IOUT = 4 Amps
–40
–60
–80
–100
100 200 400 1K 2K
10K 20K
FREQUENCY, f (Hz)
100K
8548-34 Rev. H 4/12
MECHANICAL SPECIFICATIONS
Weight=61 Grams Typical
Contains Internal BeO (Beryllium Oxide)
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
ORDERING INFORMATION
BBF2812S
SCREENING
BLANK= INDUSTRIAL; H= MIL-PRF-38534 CLASS H
SINGLE OUTPUT
OUTPUT VOLTAGE
03=3.3V; 05=5V; 12=12V; 15=15V
NOMINAL INPUT VOLTAGE
GENERAL PART NUMBER
The above example is an industrial grade 12V single output converter
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
Contact MSK for MIL-PRF-38534 qualification status.
11
8548-34 Rev. H 4/12