ETC DAC2812SH

ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
6W
DC-DC
CONVERTERS
DAC2800S
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
HI-REL DESIGN
• WAVE SOLDERABLE PACKAGE
• ALL CERAMIC CAPACITORS
• SURFACE MOUNT MAGNETICS
FEATURES
• REPLACES APEX DHC2812S, DHC2815S
• NO DERATING — –55°C TO +125°C
• HIGH ISOLATION — 500V
• OUTPUT VOLTAGE ADJUSTMENT STANDARD
• REMOTE SHUTDOWN
• 11 – 50V INPUT @ 5 WATTS OUTPUT
TYPICAL APPLICATION
DESCRIPTION
The DAC2812S and DAC2815S DC-DC converters are
higher output voltage companion devices to MSK's DHC
types. The DAC's provide the ruggedness, reliability and
features required to meet the advanced design challenges of
today's hi-rel market. This has been accomplished while
retaining a power density of 15 W/in3 and 375 mW/gram of
power/package performance. The use of advanced substrate
and reflow soldering techniques during construction results in
a rugged, cost-effective and completely solderable package.
The DAC2800S hybrid converter series utilizes all ceramic
capacitors, surface mount magnetics, and ultrasonically bonded
wires to provide reliable operation at all operating temperatures while surviving G forces of up to 500 G.
The DAC2800S series standard features include output
fault monitoring and/or turn on voltage point programming via
the shutdown pin. All three functions may be implemented
simultaneously with a minimum of external components. An
output voltage adjustment / load compensation pin which
adjusts outputs simultaneously is also standard.
Fault tolerant design protects these converters from most
external circuit faults. The +output and output adjust pins will
withstand +25 V while the shutdown pin will withstand +50 V,
protecting the converters from a variety of system or board
faults; e.g. 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.
A transformer isolated flyback converter topology operating
at a switching frequency of 400 kHz allows operation over a
wide input voltage range. Internal filtering of outputs eliminates
the need for external capacitors in many applications.
The 8-pin package is hermetically sealed and isolated from
the internal circuits. Heat sinking is recommended for full
power operation at elevated ambient temperatures.
BLOCK DIAGRAM
6
1
2
PWM
FEED FORWARD
CONTROLLER
5
7
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
4
EXTERNAL CONNECTIONS
1
2
3
4
5
1
+OUTPUT
OUTPUT COMMON
N/C
ADJUST/COMP
SHUTDOWN PLUS
8
CASE
7
-INPUT
6
+INPUT
Rev. A 3/01
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812S • DAC2815S
ABSOLUTE MAXIMUM RATINGS
INPUT VOLTAGE RANGE (Pin 7 to 6 or 5)
INPUT TRANSIENT (Pin 7 to 6)
OUTPUT CURRENT (Continuous)
TEMPERATURE, Storage
TEMPERATURE, Pin Soldering 10s
SPECIFICATIONS
PARAMETER
DAC2812S
50Vdc
80V @ 50ms
450mA
–65°C, 150°C
300°C
DAC2812S
DAC2815S
50Vdc
80V @ 50ms
360mA
–65°C, 150°C
300°C
DAC2815S
TEST CONDITIONS1
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
–55°C ↔ 125°C
Io = 10%
VIN = 16 ↔ 40
VIN = 11 ↔ 50
VIN = 16 ↔ 40
VIN = 11 ↔ 50
Io= 100%
VIN = 11 ↔ 502
Po = 0-5.4W2
11
11.9
28
12
50
12.1
450
417
5.4
5
11
14.9
28
15
50
15.1
360
333
5.4
5
62
67
5
5
63
68
5
5
Vdc
Vdc
mAdc
mAdc
W
W
%
mV
mV
°C
STEADY STATE
CHARACTERISTICS
INPUT VOLTAGE RANGE
OUTPUT VOLTAGE
OUTPUT CURRENT –55°C × 125°C
OUTPUT POWER –55°C × 125°C
EFFICIENCY
LINE REGULATION
LOAD REGULATION
OPERATING TEMPERATURE, CASE
TEMPERATURE COEFFICIENT
(Vout)
INPUT RIPPLE CURRENT
WITH 1µH SERIES INDUCTANCE
OUTPUT RIPPLE VOLTAGE
LOAD CAPACITANCE (OUTPUT
OVER –55°C × 125°C)
SHORT CIRCUIT DISSIPATION
QUIESCENT INPUT CURRENT
INHIBITED
–55
0.006
340
45
15
Bandwidth = 10kHz → 1MHz
Bandwidth = 10kHz → 1MHz
Bandwidth = 10kHz → 1MHz
VIN = 16 ↔ 40
VIN = 11 ↔ 50
0.09
25
25
125
25
25
125
–55
0.5
50
1.25
70
2.5
%/°C
mArms
mArms
mVrms
µF
µF
W
mA
mA
400
400
500
MΩ
pF
200
200
200
200
mV
µS
100
400
100
500
mV
µS
500
150
500
150
mV
µS
100
500
0
250
40
100
600
0
250
40
mV
µS
mV
µS
mS
0.5
50
1.25
0.006
340
45
15
400
55
60
200
100
70
2.5
0.09
400
55
60
200
100
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
LEAKAGE CAPACITANCE
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE, 10µs rise
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 200 µF OUTPUT
CAPACITORS3
VOLTAGE CHANGE
RECOVERY TIME (99%)
LOAD STEP RESPONSE, 10µs rise
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 200 µF OUTPUT
CAPACITORS3
VOLTAGE CHANGE
RECOVERY TIME (99%)
START-UP OVERSHOOT
SHUTDOWN DELAY
SHUTDOWN RECOVERY
NOTES:
500 Vdc
10kHz
100
100
VIN = 16 ↔ 40Vdc, Io = 100%
Io= 50–100–50%
VIN = 0 → 28 Vdc
Pin 5 = >10↔ <8 Vdc
Pin 5 = > 8↔ <10Vdc
1. Unless otherwise stated TC = 25°, VIN = 28V, Po = 5 watts,
PACKAGE & THERMAL SPECIFICATIONS
2
500
60
2. Regulation measured on output pins 1/16" from case.
MIN
WEIGHT
TEMPERATURE RISE, junction to case
TEMPERATURE RISE, case to ambient
500
60
TYP
MAX
UNITS
14
17
30
25
GRAMS
°C
°C/W
Rev. A 3/01
TYPICAL PERFORMANCE
GRAPHS
DAC2812S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
50
TEMP = 25°C
50%
40
55%
60%
64%
30
67%
20
69%
TEMP = –55°C
40%
40
50%
55%
30
60%
63%
65%
66%
67%
20
50
INPUT VOLTAGE, VIN (V)
30%
40%
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
50
TEMP =
125°C
40%
50%
40
56%
61%
64%
30
66%
20
68%
13
12
11
10
0
1
2
3
4
5
6
OUTPUT CURRENT, POUT (W)
450mA
LOAD
16
OUTPUT RESPONSE, X (UNITS/DIV)
20V
200mV
TURN ON VOLTAGE, ETO (V)
20
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, RSP (Ω)
AUDIO REJECTION, A V (dB)
200mV
450mA
LOAD
225mA
INCLUDES 200µF ON OUTPUT BUS
TIME, t (500µsec/DIV)
LINE TRANSIENT RESPONSE
24
–20
225mA NO OUTPUT BUS CAPCITANCE
VOUT
TIME, t (100µsec/DIV)
TURN ON THRESHOLD
28
0
VOUT
VOUT
VIN
TURN ON RESPONSE
OUTPUT LOAD = 450mA
IOUT = 450mA
40V
16V
INCLUDES 4.7µf ON OUTPUT BUS
TIME, t (100µsec/DIV)
RESPONSE, X (UNITS/DIV)
20V
5V
14
100mA
INPUT VOLTAGE, VIN (V)
OUTPUT DC
POWER RATING
15
2
3
4
5
OUTPUT CURRENT, POUT (W)
LOAD TRANSIENT RESPONSE 200µF
100mA
LOAD TRANSIENT RESPONSE
10
1
OUTPUT RESPONSE, X (UNITS/DIV)
LOW LINE DROP OUT
16
500mV
2
3
4
5
OUTPUT POWER, POUT (W)
68%
11
.18 .36
.72
1.08
1.44
1.8
OUTPUT CURRENT, IOUT (A)
OUTPUT RESPONSE, X (UNITS/DIV)
10
1
12V
VOUT
VIN
0V
28V
INCLUDES 200µF
ON OUTPUT
TIME, t (10msec/DIV)
AUDIO REJECTION
VIN = 28V
IOUT = 450mA
–40
–60
–80
–100
1K
10K
FREQUENCY, f (Hz)
100K
3
Rev. A 3/01
TYPICAL PERFORMANCE
GRAPHS
DAC2815S
EFFICIENCY CONTOURS
68%
20
70%
50%
40
58%
LOW LINE DROP OUT
1
2
3
4
5
6
OUTPUT CURRENT, POUT (W)
500mV
LOAD
180mA NO OUTPUT BUS CAPCITANCE
TURN ON THRESHOLD
RESPONSE, X (UNITS/DIV)
20V
5V
TURN ON VOLTAGE, ETO (V)
OUTPUT LOAD = 360mA
20
16
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, RSP (Ω)
AUDIO REJECTION, A V (dB)
–20
67%
20
68%
2
3
4
5
OUTPUT CURRENT, POUT (W)
VOUT
15V
VOUT
VIN
0V
28V
INCLUDES 200µF
ON OUTPUT
TIME, t (10msec/DIV)
360mA
LOAD
180mA
INCLUDES 200µF ON OUTPUT BUS
TIME, t (500µsec/DIV)
TURN ON RESPONSE
24
65%
TIME, t (100µsec/DIV)
28
0
30
LINE TRANSIENT RESPONSE
VOUT
VOUT = 360mA
200mV
0
61%
LOAD TRANSIENT RESPONSE 200µF
OUTPUT RESPONSE, X (UNITS/DIV)
10
VOUT
360mA
100mA
11
OUTPUT RESPONSE, X (UNITS/DIV)
INPUT VOLTAGE, VIN (V)
12
56%
10
1
2
3
4
5
OUTPUT CURRENT, POUT (W)
LOAD TRANSIENT RESPONSE
OUTPUT DC
POWER RATING
13
69%
20
10
1
16
14
66%
40
72%
2
3
4
5
OUTPUT CURRENT, POUT (W)
15
62%
30
TEMP =
125°C
50%
200mV
64%
30
40%
TEMP = –55°C
100mA
56%
40%
INPUT VOLTAGE, VIN (V)
TEMP = 25°C
50%
40V
20V
40%
60%
10
1
EFFICIENCY CONTOURS
50
OUTPUT RESPONSE, X (UNITS/DIV)
40
EFFICIENCY CONTOURS
50
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
50
16V
VIN
INCLUDES 4.7µF ON OUTPUT BUS
TIME, t (100µsec/DIV)
AUDIO REJECTION
VIN = 28V
IOUT = 360mA
–40
–60
–80
–100
1K
10K
FREQUENCY, f (Hz)
100K
4
Rev. A 3/01
TYPICAL PERFORMANCE
GRAPHS
DAC2812S • DAC2815S
with a high impedance monitoring circuit. Pin 5 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 5 will return low and the cycle will repeat. A resistor
> 400 KΩ from pin 5 to 7 provides pull down for pin 5 if there
is no input setpoint programming resistor already in place.
OUTPUT ADJUST / COMP
The output voltage of the DAC2812S and DAC2815S may
be adjusted from 90% to 110% of nominal value by the use of
a 150KΩ 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 applica-
4
1
LOAD FAULT RESPONSE
The MSK families of DC-DC converters share load fault
philosophies. Load fault conditions include short-circuit and
severe overload conditions. The DAC2800 converter series
responds to load faults by turning off all power conversion
circuits for 250 mS and then attempting to restart for 10 mS
(typical). The net "on" duty factor during a fault is very low
resulting in low converter dissipation and immunity from overheating at 125°C. Current beyond rated can flow into the load
at startup time. This allows the converter to bring up capacitive
and other difficult load types more reliably than competing
converters.
2
150K
10nF
tions.
Adjust/comp (pin 4) may be driven by external circuitry
referenced to pin 2 (-output) if desired. Grounding pin 4 causes
voltage to increase (25% typically) while driving pin 4 above
1.3 V causes output voltage to decrease. Pin 4 may be driven
negative without damage, however the resultant increase in
converter output voltage should be considered. 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 load transient response to
be tailored to suit specific application requirements. This
feature may be utilized by connecting a 10 or less nF capacitor
between pins 4 and 1.
Note: The DAC2812S and DAC2815S use pin 4 while the
DHC2803S and DHC2805S use pin 3.
Vo
O
Io
O
SHUTDOWN PLUS
NORMAL
Pin 5 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 5 is necessary for normal operation of the
converter. Pin 5 is referenced to pin 7 (-input).
Shutdown may be implemented by simply connecting pin 5
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 5 to 7. 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 3
R =
ETO – 9.5
LOAD FAULT
NORMAL
TIME
O
(+/– 10% accuracy at 25 C)
O
Set point temperature coefficient is typically + 400ppm/ C
Output fault monitoring is accomplished by observing pin 5
5
Rev. A 3/01
MECHANICAL SPECIFICATIONS
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
DAC2812S
ORDERING INFORMATION
SCREENING
BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY;
H= CLASS H; K= CLASS K
SINGLE OUTPUT
OUTPUT VOLTAGE
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.
6
Rev. A 3/01