ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
20W
DC-DC
CONVERTERS
BBF2800S
SERIES
(315) 701-6751
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 55°C to +125°C
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.
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
BLOCK DIAGRAM
1
6
12
5
PWM
CURRENT MODE
CONTROLLER
2
3
10
11
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
7
4
8
1
Rev. - 3/01
BBF2803S
ABSOLUTE MAXIMUM
RATINGS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
INPUT VOLTAGE RANGE (Pin 12 to 1, 2, 3, 10 or 11)
INPUT TRANSIENT (Pin 12 to 1)
OUTPUT WITHSTAND (Pin 5 and 8 to 7, 6 or 4)
OUTPUT CURRENT (Continuous)
TEMPERATURE, Storage
TEMPERATURE, Pin Soldering 10s
0 - 50 Vdc
80 V @ 50 ms
35 Vdc
5.5 Adc
BBF2803S
4.0 Adc
BBF2805S
1.9 Adc
BBF2812S
1.5 Adc
BBF2815S
o
o
–65 C, 150 C
300
o
C
SPECIFICATIONS
PARAMETER
STEADY STATE CHARACTERISTICS
INPUT VOLTAGE RANGE
OUTPUT VOLTAGE
OUTPUT CURRENT
EFFICIENCY
OUTPUT RIPPLE VOLTAGE
INPUT RIPPLE CURRENT
OUTPUT POWER
2
LINE REGULATION
3
LOAD REGULATION
3
TEMPERATURE COEFFICIENT
TEMPERATURE RANGE, case
2
QUIESCENT CURRENT
INHIBITED
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
LEAKAGE CAPACITANCE
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE
VOLTAGE CHANGE
RECOVERY TIME (95%)
WITH 100µF OUTPUT CAP
VOLTAGE CHANGE
RECOVERY TIME (95%)
LOAD STEP RESPONSE
VOLTAGE CHANGE
RECOVERY TIME (95%)
WITH 100µF OUTPUT CAP
VOLTAGE CHANGE
RECOVERY TIME (95%)
START-UP OVERSHOOT
SHUTDOWN DELAY
SHUTDOWN RECOVERY
4
NOTES:
1.
2.
3.
4.
V
IN;
T
R
, T
F
= 10µs
V
IN
; 16 to 40 Vdc
V
IN
; 16 to 40 Vdc
I
OUT;
T
R
, T
F
= 10µs
I
OUT
; 50% to max Adc
I
OUT
; 50% to max Adc
V
IN
; 0 to 40 Vdc
V
PIN5
; > 10 Vdc to < 8 Vdc
V
PIN5
; < 8 Vdc to > 10 Vdc
(V
TEST
= 500Vdc)
(f = 10kHz)
100
V
IN
; min to max Vdc @ I
MIN
V
IN
; min to max Vdc
Bandwidth 10 kHz to 1MHz
Bandwidth 10 kHz to 1MHz
1.6
V
IN
; min to max
I
OUT
; min to max
3
–55
I
OUT
= 0 A
V
PIN5
; < 8 Vdc
.09
3
BBF2803S
TEST CONDITIONS
1
MIN
TYP
MAX
UNITS
16
3.2
500
28
3.3
66
20
20
2
1
.01
35
1.25
40
3.4
5500
50
50
18.0
20
15
125
40
2.5
Vdc
Vdc
mAdc
%
mVrms
mArms
W
mVdc
mVdc
%/°C
°C
mAdc
mAdc
50
MΩ
pF
300
30
100
100
1400
40
300
60
0
220
30
500
60
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mS
Unless otherwise stated: T
C
= 25°, V
IN
= 28V, I
OUT
= I
MAX AMPS
Derate power linearly to zero from 125°C to 135°C.
Regulation measured between pin 8 and pin 7.
Recovery spec assumes that converter has been OFF for at least 500ms.
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 850°C to avoid generating toxic fumes.
CAUTION:
CAUTION
2
Rev. - 3/01
BBF2803S
EFFICIENCY CONTOURS
40
TYPICAL PERFORMANCE
GRAPHS
EFFICIENCY CONTOURS
40
EFFICIENCY CONTOURS
40
INPUT VOLTAGE, V
IN
(V)
INPUT VOLTAGE, V
IN
(V)
35
30
25
20
68%
25
69%
50%
TEMP =
54%
–55°C
58%
60%
62%
64%
65%
66%
INPUT VOLTAGE, V
IN
(V)
40%
50%
TEMP = 25°C
56%
35
60%
64%
66%
30
67%
30%
40%
40%
50%
60%
35
64%
66%
TEMP = 125°C
30
67%
25
20
68%
69%
70%
64%
20
70%
66%
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, I
OUT
(A)
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, I
OUT
(A)
67%
16
.55 1.1
2.2
3.3
4.4
5.5
OUTPUT CURRENT, I
OUT
(A)
LOW LINE DROP OUT
OUTPUT RESPONSE, X (UNITS/DIV)
20
OUTPUT DC
CURRENT RATING
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
LOAD TRANSIENT RESPONSE 100µF
TEMP = 25°C
INPUT VOLTAGE, V
IN
(V)
1V
16
14
12
10
0.0
1V
18
V
OUT
V
OUT
5.5A
5.5A
2A
I
OUT
2A
2.75A
I
OUT
2.75A
NO OUTPUT BUS CAPCITANCE
INCLUDES 100µF ON OUTPUT BUS
2.0
4.0
6.0
OUTPUT CURRENT, I
OUT
(A)
TIME, t (100µsec/DIV)
TIME, t (200µsec/DIV)
LOAD TRANSIENT RESPONSE 1000µF
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
10V
100mV
LINE TRANSIENT RESPONSE
LOAD = 5.5A
V
OUT
1V
V
OUT
40V
5.5A
2A
I
OUT
2.75A
16V
V
IN
INCLUDES 100µF ON OUTPUT BUS
INCLUDES 1000µF ON OUTPUT BUS
TIME, t (500µsec/DIV)
TIME, t (200µsec/DIV)
TURN ON THRESHOLD
28
TURN ON RESPONSE
0
AUDIO REJECTION
V
IN
= 28VDC
I
OUT
= 5.5 Amps
TURN ON VOLTAGE, E
TO
(V)
RESPONSE, X (UNITS/DIV)
10 V
2V
3.3V
V
OUT
LOAD = 5.5A
0V
28V
AUDIO REJECTION, A
V
(dB)
–20
–40
–60
–80
24
20
16
V
IN
0V
INCLUDES 100µF ON
OUTPUT BUS
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, R
SP
(Ω)
TIME, t (5msec/DIV)
–100
100 200 400 1K 2K
10K 20K
FREQUENCY, f (Hz)
100K
4
Rev. - 3/01
TYPICAL PERFORMANCE
GRAPHS
BBF2805S
EFFICIENCY CONTOURS
40
40%
EFFICIENCY CONTOURS
40
EFFICIENCY CONTOURS
40
INPUT VOLTAGE, V
IN
(V)
INPUT VOLTAGE, V
IN
(V)
INPUT VOLTAGE, V
IN
(V)
30%
40%
50%
35
TEMP = 25°C
60%
63%
66%
30
68%
70%
71%
25
72%
35
50%
55%
60%
64%
66%
30%
50%
TEMP =
–55°C
35
30
30
25
20
15
68%
69%
70%
60%
64%
67%
69%
70%
71%
TEMP =
125°C
25
20
16
.4
20
73%
71%
72%
73%
67%
16
.4
.8
1.6
2.4
3.2
OUTPUT CURRENT, I
OUT
(A)
4
.8
1.6
2.4
3.2
OUTPUT CURRENT, I
OUT
(A)
4
.8
1.6
2.4
3.2
OUTPUT CURRENT, I
OUT
(A)
4
LOW LINE DROP OUT
OUTPUT RESPONSE, X (UNITS/DIV)
20
OUTPUT DC
CURRENT RATING
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
LOAD TRANSIENT RESPONSE 100µF
TEMP = 25°C
INPUT VOLTAGE, V
IN
(V)
1V
16
14
12
10
0.0
4A
1V
18
V
OUT
V
OUT
4A
1A
I
OUT
NO OUTPUT BUS CAPCITANCE
1A
2A
2A
I
OUT
INCLUDES 100µF ON OUTPUT BUS
1.0
2.0
3.0
4.0
5.0
OUTPUT CURRENT, I
OUT
(A)
TIME, t (100µsec/DIV)
TIME, t (200µsec/DIV)
LOAD TRANSIENT RESPONSE 1000µF
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
10V
100mV
LINE TRANSIENT RESPONSE
LOAD 4A
V
OUT
1V
V
OUT
4A
40V
1A
2A
I
OUT
INCLUDES 1000µF ON OUTPUT BUS
16V
V
IN
INCLUDES 100µF ON OUTPUT BUS
TIME, t (500µsec/DIV)
TIME, t (200µsec/DIV)
TURN ON THRESHOLD
28
TURN ON RESPONSE
0
AUDIO REJECTION
V
IN
= 28VDC
I
OUT
= 4 Amps
TURN ON VOLTAGE, E
TO
(V)
RESPONSE, X (UNITS/DIV)
10 V
2V
5.1V
V
OUT
0V
28V
AUDIO REJECTION, A
V
(dB)
–20
–40
–60
–80
24
LOAD 4A
20
16
0V V
IN
INCLUDES 100µF ON OUTPUT BUS
12
10K
20K 30K 40K50K 70K 90K
SET POINT RESISTOR, R
SP
(Ω)
TIME, t (5msec/DIV)
–100
100 200 400 1K 2K
10K 20K
FREQUENCY, f (Hz)
100K
5
Rev. - 3/01
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