HI-REL DESIGN
REPLACES APEX DB2800S SERIES
SURFACE MOUNT MAGNETICS
WELDED HERMETIC PACKAGE
LOW INTERNAL TEMPERATURE GRADIENTS
ALL CERAMIC CAPACITORS
WITHSTANDS 5000G
OTHER FEATURESSINGLE OUTPUT
NO DERATING 55C to +125C
OUTPUT VOLTAGE ADJUSTMENT STANDARD
REMOTE SHUTDOWN
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 tech-
niques 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 tolerant 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.
P W M
CURRENT MODE
CONTROLLER
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
8
7
5
6
1
2
3
10
11
12
4
BLOCK DIAGRAM
4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
BBF2800S
SERIES
ISO-9001 CERTIFIED BY DSCC
20W
DC-DC
CONVERTERS
Rev. - 3/01
1
EXTERNAL CONNECTIONS
1
2
3
4
5
6
+INPUT
SHUTDOWN PLUS
CLOCK
ADJUST/COMP
-OUTPUT
+OUTPUT
12
11
10
9
8
7
-INPUT
TIMING 2
TIMING 1
CASE
-SENSE
+SENSE
BBF2803S
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM
RATINGS
INPUT VOLTAGE RANGE (Pin 12 to 1, 2, 3, 10 or 11)
0 - 50 Vdc
INPUT TRANSIENT (Pin 12 to 1)
80 V @ 50 ms
OUTPUT WITHSTAND (Pin 5 and 8 to 7, 6 or 4)
35 Vdc
OUTPUT CURRENT (Continuous)
5.5 Adc
BBF2803S
4.0 Adc
BBF2805S
1.9 Adc
BBF2812S
1.5 Adc
BBF2815S
TEMPERATURE, Storage
65
o
C, 150
o
C
TEMPERATURE, Pin Soldering 10s
300
o
C
NOTES:
1.
Unless otherwise stated:
T
C
= 25, V
IN
= 28V, I
OUT
= I
MAX AMPS
2.
Derate power linearly to zero from 125C to 135C.
3.
Regulation measured between pin 8 and pin 7.
4.
Recovery spec assumes that converter has been OFF for at least 500ms.
CAUTION:
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850C to avoid generating toxic fumes.
CAUTION
SPECIFICATIONS
BBF2803S
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
UNITS
STEADY STATE CHARACTERISTICS
INPUT VOLTAGE RANGE
16
28
40
Vdc
OUTPUT VOLTAGE
V
IN
; min to max Vdc @ I
MIN
3.2
3.3
3.4
Vdc
OUTPUT CURRENT
V
IN
; min to max Vdc
500
5500
mAdc
EFFICIENCY
66
%
OUTPUT RIPPLE VOLTAGE
Bandwidth 10 kHz to 1MHz
20
50
mVrms
INPUT RIPPLE CURRENT
Bandwidth 10 kHz to 1MHz
20
50
mArms
OUTPUT POWER
2
1.6
18.0
W
LINE REGULATION
3
V
IN
; min to max
3
2
20
mVdc
LOAD REGULATION
3
I
OUT
; min to max
3
1
15
mVdc
TEMPERATURE COEFFICIENT
.01
%/C
TEMPERATURE RANGE, case
2
55
125
C
QUIESCENT CURRENT
I
OUT
= 0 A
35
40
mAdc
INHIBITED
V
PIN5
; < 8 Vdc
.09
1.25
2.5
mAdc
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
(V
TEST
= 500Vdc)
100
M
LEAKAGE CAPACITANCE
(f = 10kHz)
50
pF
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE
V
IN;
T
R
, T
F
= 10s
VOLTAGE CHANGE
V
IN
; 16 to 40 Vdc
300
mV
RECOVERY TIME (95%)
30
s
WITH 100F OUTPUT CAP
VOLTAGE CHANGE
V
IN
; 16 to 40 Vdc
100
mV
RECOVERY TIME (95%)
100
s
LOAD STEP RESPONSE
I
OUT;
T
R
, T
F
= 10s
VOLTAGE CHANGE
I
OUT
; 50% to max Adc
1400
mV
RECOVERY TIME (95%)
40
s
WITH 100F OUTPUT CAP
VOLTAGE CHANGE
I
OUT
; 50% to max Adc
300
mV
RECOVERY TIME (95%)
60
s
START-UP OVERSHOOT
V
IN
; 0 to 40 Vdc
0
mV
SHUTDOWN DELAY
V
PIN5
; > 10 Vdc to < 8 Vdc
220
500
s
SHUTDOWN RECOVERY
4
V
PIN5
; < 8 Vdc to > 10 Vdc
30
60
mS
Rev. - 3/01
2
BBF2803S
TYPICAL PERFORMANCE
GRAPHS
0.0
6.0
OUTPUT CURRENT, I
OUT
(A)
10
12
14
16
18
20
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
2.0
4.0
10K
90K
60K
20K
30K 40K
INPUT VOLTAGE, V
IN
(V)
TIME, t (500
sec/DIV)
LOAD TRANSIENT RESPONSE 1000
F
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
16
30
40
35
20
25
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT CURRENT, I
OUT
(A)
4.4
.55 1.1
2.2
3.3
5.5
SET POINT RESISTOR, R
SP
(
)
TIME, t (5msec/DIV)
12
16
20
24
28
TURN ON THRESHOLD
TURN ON VOLTAGE, E
TO
(V)
TURN ON RESPONSE
100 200 400
FREQUENCY, f (Hz)
100
AUDIO REJECTION
AUDIO REJECTION, A
V
(dB)
0
20
40
1K 2K
10K 20K
100K
60
80
RESPONSE, X (UNITS/DIV)
3.3V
0V
0V
28V
V
OUT
V
IN
TEMP = 25
C
40%
50%
56%
60%
64%
66%
67%
68%
69%
66%
70%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
16
30
40
35
20
25
OUTPUT CURRENT, I
OUT
(A)
TEMP = 125
C
40%
50%
60%
64%
66%
67%
68%
69%
70%
64%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
16
30
40
35
20
25
OUTPUT CURRENT, I
OUT
(A)
4.4
1.1
.55
2.2
3.3
5.5
4.4
1.1
.55
2.2
3.3
5.5
TEMP =
55
C
30%
40%
50%
54%
58%
60%
62%
64%
65%
66%
67%
INCLUDES 1000
F ON OUTPUT BUS
TIME, t (200
sec/DIV)
TIME, t (200
sec/DIV)
LOAD TRANSIENT RESPONSE 100
F
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
LOAD = 5.5A
LOAD = 5.5A
INCLUDES 100
F ON OUTPUT BUS
INCLUDES 100
F ON OUTPUT BUS
INCLUDES 100
F ON
OUTPUT BUS
TIME, t (100
sec/DIV)
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
5.5A
5.5A
5.5A
2.75A
2.75A
2.75A
V
OUT
V
OUT
V
OUT
V
IN
16V
40V
V
OUT
I
OUT
I
OUT
I
OUT
1 V
2 A
1 V
2 A
100mV
10V
1 V
10 V
2
V
2 A
NO OUTPUT BUS CAPCITANCE
V
IN
= 28VDC
I
OUT
= 5.5 Amps
OUTPUT DC
CURRENT RATING
TEMP = 25
C
Rev. - 3/01
4
BBF2805S
TYPICAL PERFORMANCE
GRAPHS
0.0
5.0
OUTPUT CURRENT, I
OUT
(A)
10
12
14
16
18
20
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
1.0
2.0
3.0
4.0
10K
90K
70K
20K
30K 40K50K
INPUT VOLTAGE, V
IN
(V)
TIME, t (500
sec/DIV)
LOAD TRANSIENT RESPONSE 1000
F
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
16
30
40
35
20
25
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT CURRENT, I
OUT
(A)
3.2
.4
.8
1.6
2.4
4
SET POINT RESISTOR, R
SP
(
)
TIME, t (5msec/DIV)
12
16
20
24
28
TURN ON THRESHOLD
TURN ON VOLTAGE, E
TO
(V)
TURN ON RESPONSE
100 200 400
FREQUENCY, f (Hz)
100
AUDIO REJECTION
AUDIO REJECTION, A
V
(dB)
0
20
40
1K 2K
10K 20K
100K
60
80
RESPONSE, X (UNITS/DIV)
5.1V
0V
0V
28V
V
OUT
V
IN
TEMP = 25
C
30%
40%
50%
60%
68%
70%
63%
66%
71%
72%
73%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
16
30
40
35
20
25
OUTPUT CURRENT, I
OUT
(A)
3.2
.4
.8
1.6
2.4
4
TEMP =
125
C
30%
50%
60%
64%
67%
67%
69%
70%
71%
72%
73%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
15
30
40
35
20
25
OUTPUT CURRENT, I
OUT
(A)
3.2
.8
1.6
2.4
4
TEMP =
55
C
40%
50%
55%
60%
64%
71%
66%
68%
70%
69%
INCLUDES 1000
F ON OUTPUT BUS
TIME, t (200
sec/DIV)
TIME, t (200
sec/DIV)
LOAD TRANSIENT RESPONSE 100
F
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
INCLUDES 100
F ON OUTPUT BUS
INCLUDES 100
F ON OUTPUT BUS
INCLUDES 100
F ON OUTPUT BUS
TIME, t (100
sec/DIV)
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
4A
4A
4A
2A
2A
2A
V
OUT
V
OUT
V
OUT
V
IN
16V
40V
LOAD 4A
LOAD 4A
V
OUT
I
OUT
I
OUT
I
OUT
1 V
1 A
1 V
1 A
100mV
10V
1 V
10 V
2
V
1 A
NO OUTPUT BUS CAPCITANCE
V
IN
= 28VDC
I
OUT
= 4 Amps
OUTPUT DC
CURRENT RATING
TEMP = 25
C
Rev. - 3/01
5
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