Datasheet BBF2815SK, BBF2815SH, BBF2815SE, BBF2815S, BBF2812SK Datasheet (MSK)

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Page 1

HI-REL DESIGN

 REPLACES APEX DB2800S SERIES

 SURFACE MOUNT MAGNETICS

 WELDED HERMETIC PACKAGE

 LOW INTERNAL TEMPERATURE GRADIENTS

 ALL CERAMIC CAPACITORS

 WITHSTANDS 5000G

OTHER FEATURESSINGLE 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 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 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

3 10 11

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. - 3/011

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

Page 2

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

C, 150oC

TEMPERATURE, Pin Soldering 10s 300oC

NOTES: 1. Unless otherwise stated: TC = 25°, VIN = 28V, I

OUT

= I

MAX AMPS

2. Derate power linearly to zero from 125°C to 135°C.

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 850°C to avoid generating toxic fumes.

CAUTION

SPECIFICATIONS

BBF2803S

PARAMETER TEST CONDITIONS

MIN TYP MAX UNITS

STEADY STATE CHARACTERISTICS

INPUT VOLTAGE RANGE 16 28 40 Vdc OUTPUT VOLTAGE VIN; min to max Vdc @ I

MIN

3.2 3.3 3.4 Vdc

OUTPUT CURRENT VIN; 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

1.6 18.0 W

LINE REGULATION

VIN; min to max

2 20 mVdc

LOAD REGULATION

OUT

; min to max

1 15 mVdc

TEMPERATURE COEFFICIENT .01 %/°C TEMPERATURE RANGE, case

–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 MΩ

LEAKAGE CAPACITANCE (f = 10kHz) 50 pF

DYNAMIC CHARACTERISTICS

LINE STEP RESPONSE V

IN; TR

, TF = 10µs VOLTAGE CHANGE VIN; 16 to 40 Vdc 300 mV RECOVERY TIME (95%) 30 µs

WITH 100µF OUTPUT CAP

VOLTAGE CHANGE VIN; 16 to 40 Vdc 100 mV RECOVERY TIME (95%) 100 µs

LOAD STEP RESPONSE I

OUT; TR

, TF = 10µs

VOLTAGE CHANGE I

OUT

; 50% to max Adc 1400 m V

RECOVERY TIME (95%) 40 µs

WITH 100µF OUTPUT CAP

VOLTAGE CHANGE I

OUT

; 50% to max Adc 300 mV

RECOVERY TIME (95%) 60 µs

START-UP OVERSHOOT VIN ; 0 to 40 Vdc 0 mV SHUTDOWN DELAY V

PIN5

; > 10 Vdc to < 8 Vdc 220 500 µs

SHUTDOWN RECOVERY

PIN5

; < 8 Vdc to > 10 Vdc 30 60 mS

Rev. - 3/012

Page 3

SPECIFICATIONS

BBF2805S  BBF2812S  BBF2815S

BBF2805S BBF2812S BBF2815S

MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

16 28 40 16 28 40 16 28 40 Vdc

5.00 5.05 5.1 12.00 12.05 12.1 15.0 15.1 15.2 Vdc 400 4000 190 1900 150 1500 mAdc

70 72 73 % 20 50 25 50 25 50 mVrms 20 30 20 30 20 30 mArms

2 20 2.3 23 2.2 22 W

5 50 5 50 10 50 mVdc 2 25 5 50 20 50 mVdc

.01 .01 .01 %/°C

–55 125 –55 125 –55 125 °C

35 40 35 40 35 40 mAdc

.09 1.25 2.5 .09 1.25 2.5 .9 1.25 2.5 mAdc

100 100 100 MΩ

50 80 85 pF

400 300 300 mV

30 40 40 µs

200 150 150 mV 250 250 250 µs

1400 800 800 mV

40 60 60 µs

500 280 280 mV 150 400 400 µs

000mV

220 500 220 500 220 500 µs

30 60 30 60 30 60 ms

PACKAGE THERMAL SPECIFICATIONS MIN TYP MAX UNITS RESISTANCE, case to air 12 °C/W

TEMPERATURE RISE, junction to case 10 15 °C

Rev. - 3/013

Page 4

BBF2803S

TYPICAL PERFORMANCE

GRAPHS

0.0 6.0 OUTPUT CURRENT, I

OUT

(A)

LOW LINE DROP OUT

INPUT VOLTAGE, V

(V)

2.0 4.0

10K 90K60K20K 30K 40K

INPUT VOLTAGE, V

(V)

TIME, t (500µsec/DIV)

LOAD TRANSIENT RESPONSE 1000µF LINE TRANSIENT RESPONSE

EFFICIENCY CONTOURS

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

(Ω) TIME, t (5msec/DIV)

TURN ON THRESHOLD

TURN ON VOLTAGE, E

(V)

TURN ON RESPONSE

100 200 400

FREQUENCY, f (Hz)

–100

AUDIO REJECTION

AUDIO REJECTION, A

(dB)

–20

–40

1K 2K 10K20K 100K

–60

–80

RESPONSE, X (UNITS/DIV)

3.3V

28V

OUT

TEMP = 25°C

40%

50%

56%

60%

64%

66%

67%

68%

69%

66%

70%

INPUT VOLTAGE, V

(V)

EFFICIENCY CONTOURS

OUTPUT CURRENT, I

OUT

(A)

TEMP = 125°C

40%

50%

60%

64%

66%

67%

68%

69%

70%

64%

INPUT VOLTAGE, V

(V)

EFFICIENCY CONTOURS

OUTPUT CURRENT, I

OUT

(A)

4.41.1.55 2.2 3.3 5.5 4.41.1.55 2.2 3.3 5.5

TEMP = –55°C

30%

40%

50%

54%

58%

60%

62%

64%

65%

66%

67%

INCLUDES 1000µF ON OUTPUT BUS

TIME, t (200µsec/DIV)

LOAD TRANSIENT RESPONSE 100µF

OUTPUT RESPONSE, X (UNITS/DIV)

LOAD = 5.5A

INCLUDES 100µF ON OUTPUT BUS

INCLUDES 100µF ON

OUTPUT BUS

TIME, t (100µsec/DIV)

LOAD TRANSIENT RESPONSE

OUTPUT RESPONSE, X (UNITS/DIV)

5.5A

2.75A

OUT

16V

40V

OUT

1 V2 A

100mV10V

1 V

10 V 2 V

2 A

NO OUTPUT BUS CAPCITANCE

VIN = 28VDC I

OUT

= 5.5 Amps

OUTPUT DC

CURRENT RATING

TEMP = 25°C

Rev. - 3/014

Page 5

BBF2805S

TYPICAL PERFORMANCE

GRAPHS

0.0 5.0 OUTPUT CURRENT, I

OUT

(A)

LOW LINE DROP OUT

INPUT VOLTAGE, V

(V)

1.0 2.0 3.0 4.0

10K 90K70K20K 30K 40K50K

INPUT VOLTAGE, V

(V)

TIME, t (500µsec/DIV)

LOAD TRANSIENT RESPONSE 1000µF LINE TRANSIENT RESPONSE

EFFICIENCY CONTOURS

OUTPUT RESPONSE, X (UNITS/DIV)

OUTPUT CURRENT, I

OUT

(A)

3.2.4 .8 1.6 2.4 4

SET POINT RESISTOR, R

(Ω) TIME, t (5msec/DIV)

TURN ON THRESHOLD

TURN ON VOLTAGE, E

(V)

TURN ON RESPONSE

100 200 400

FREQUENCY, f (Hz)

–100

AUDIO REJECTION

AUDIO REJECTION, A

(dB)

–20

–40

1K 2K 10K20K 100K

–60

–80

RESPONSE, X (UNITS/DIV)

5.1V

28V

OUT

TEMP = 25°C

30%

40%

50%

60%

68%

70%

63%

66%

71%

72%

73%

INPUT VOLTAGE, V

(V)

EFFICIENCY CONTOURS

OUTPUT CURRENT, I

OUT

(A)

3.2.4 .8 1.6 2.4 4

TEMP = 125°C

30%

50%

60%

64%

67%

69%

70%

71%

72%

73%

INPUT VOLTAGE, V

(V)

EFFICIENCY CONTOURS

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 1000µF ON OUTPUT BUS

TIME, t (200µsec/DIV)

LOAD TRANSIENT RESPONSE 100µF

OUTPUT RESPONSE, X (UNITS/DIV)

INCLUDES 100µF ON OUTPUT BUS

TIME, t (100µsec/DIV)

LOAD TRANSIENT RESPONSE

OUTPUT RESPONSE, X (UNITS/DIV)

OUT

16V

40V

LOAD 4A

OUT

1 V1 A

100mV10V

1 V

10 V 2 V

1 A

NO OUTPUT BUS CAPCITANCE

VIN = 28VDC I

OUT

= 4 Amps

OUTPUT DC

CURRENT RATING

TEMP = 25°C

Rev. - 3/015

Page 6

BBF2800S SERIES

APPLICATION

INFORMATION

OUTPUT ADJUST / COMP

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.

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 1.3 V 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 (1-500 nf) 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 2.5 mA, 25 Vdc 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:

210 • 10

R = (±10% accuracy at 25°C)

– 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 10 V to below 1 V when a load fault causes the converters fault protection circuitry to activate. It will remain low for at least 100 mS 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 > 400 KΩ from pin 2 to 12 will provide pin 2 pull down.

MULTIPLE CONVERTER SYNCHRONIZATION

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.

4 7 8

50KΩ

TYPICAL APPLICATION

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.

Rev. - 3/016

Page 7

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.

M.S. Kennedy Corp.

4707 Dey Road, Liverpool, New York 13088

Phone (315) 701-6751

FAX (315) 701-6752

www.mskennedy.com

NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ESD Triangle indicates Pin 1.

BBF2812S

The above example is an industrial grade 12V single output converter

ORDERING INFORMATION

SCREENING

BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY;

H= CLASS H; K= CLASS K

SINGLE OUTPUT

OUTPUT VOLTAGE

03=3.3V; 05=5V; 12=12V; 15=15V

NOMINAL INPUT VOLTAGE

GENERAL PART NUMBER

Rev. - 3/01

MECHANICAL SPECIFICATIONS