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BBF2800S 데이터시트, 핀배열, 회로
MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
20W
DC-DC
CONVERTERS
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
ISO-9001 CERTIFIED BY DSCC
BBF2800S
SERIES
(315) 701-6751
www.DataSheet4U.com
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 Rev. F 12/06




BBF2800S pdf, 반도체, 판매, 대치품
ELECTRICAL SPECIFICATIONS
BBF2805S
Parameter
Output Voltage
Output Current 2
Output Voltage Ripple
Input Current Ripple 2
Line Regulation
Load Regulation
Efficiency
Step Load Response 2
Step Load Recovery 2
Step Line Response 2
Step Line Recovery 2
Start Up Overshoot
Start Up Delay 2
Shutdown Delay 2
Shutdown Recovery 2
Input Voltage Range 2
Quiescent Current
Capacitive Load 2
Isolation
Short Circuit Current Limit 7
Switching Frequency
VOUT Adjustment Range
Test Conditions 1
16VVIN40V
BW=10KHz to 2MHz
BW=10KHz to 2MHz
VIN=16V to 40V
IOUT=0.4A to 4.0A
IOUT=2A to/from 4A
Transition TIme=30µS
IOUT=2A to/from 4A
Transition TIme=30µS
VIN=16V to/from 40V
Transition Time=30µS
VIN=16V to/from 40V
Transition Time=30µS
IOUT=4.0A
IOUT=4.0A
POUT=20W MAX.
Enabled, IOUT=0mA
Disabled IOUT=0mA
No Effect on DC Performance
Input to output or any pin to case @ 500V
RPOT=50K
Group A
Subgroup
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
1
2,3
4
5,6
4
5,6
4
5,6
4
5,6
4
5,6
4
5,6
4
5,6
-
1,2,3
1
2,3
1,2,3
1,2,3
1
1
4
1
BBF2805S H/E
Min.
5.00
4.90
400
400
-
-
-
-
-
-
-
-
65
61
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
16
-
-
-
-
100
4.0
475
±10
Typ.
5.05
-
-
-
20
-
20
-
±5
-
±2
-
72
-
±700
-
100
-
±500
-
80
-
0
-
30
-
120
-
20
-
35
-
1.25
-
-
6.0
500
-
Max.
5.10
5.20
4000
4000
50
60
50
60
±25
±50
±25
±50
-
-
±1000
±1500
200
300
±800
±1100
200
300
400
800
60
100
500
550
60
40
40
50
2.5
300
-
7.0
525
-
BBF2805S
Units
Min. Typ. Max.
4.95 5.05 5.15 VDC
--
- VDC
400 - 4000 mA
--
- mA
- 20 60 mVrms
--
- mVrms
- 20 60 mArms
--
- mArms
- ±5 ±50 mV
--
- mV
- ±2 ±50 mV
--
- mV
65 72
-%
--
-%
- ±700 ±1200 mV
--
- mV
- 100 220 µS
--
- µS
- ±500 ±900 mV
--
- mV
- 80 220 µS
--
- µS
- 0 400 mV
--
- mV
- 30 60 mS
- - 100 mS
- 120 500 µS
--
- µS
- 20 60 mS
16 - 40 V
- 35 40 mA
--
- mA
- 1.25 2.5 mA
- - 300 µF
100 -
- M
4.0 6.0 7.0 A
475 500 525 KHz
±10
-
-%
NOTES:
1 +VIN = 28V, IOUT = 4.0A, TA=TC=25°C unless otherwise specified.
2 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
3 Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
4 Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
5 Subgroups 5 and 6 testing available upon request.
6 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.
4 Rev. F 12/06

4페이지










BBF2800S 전자부품, 판매, 대치품
APPLICATION NOTES
POWER SUPPLIES
The output voltage of the BBF2800S may be adjusted from
90% to 110% of nominal value by the use of a 50Kpotenti-
ometer 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 tem-
perature performance will change. Characterization by the user
is recommended in such applications.
Adjust/comp (pin 4) may be driven by external circuitry refer-
enced 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 10Kor 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) capaci-
tor between pins 4 and 6 or 7. This is generally recommended
when very large low ESR load capacitances are used.
MULTIPLE CONVERTER SYNCHRONIZATION
Synchronized operation of up to three BBF2800S series con-
verters 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 sig-
nal 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 pre-
serve signal integrity. Shield ends should be connected to pin
12 of the nearest converter.
BBF2800S converters may also be synchronized to an exter-
nal 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 fre-
quency 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.
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 resis-
tor 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 (±10% accuracy at 25°C)
ETO-9.5
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
>400Kfrom pin 2 to 12 will provide pin 2 pull down.
7
Rev. F 12/06

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