DHC2815S [ETC]
DC-to-DC Voltage Converter ; 直流 - 直流电压转换器\n
| 型号： | DHC2815S |
| 厂家： | 
ETC |
| 描述： | DC-to-DC Voltage Converter
|
| 文件： | 总5页 (文件大小：112K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DHC2800S SERIES 5W/5.4W DC-DC CONVERTERS
DHC2812S • DHC2815S
M
I
C
R
O
T
E
C
H
N
O
L
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G
Y
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
HI-REL DESIGN
• WAVE SOLDERABLE PACKAGE
• ALL CERAMIC CAPACITORS
• SURFACE MOUNT MAGNETICS
FEATURES
• NO DERATING — –55°C TO +125°C
• HIGH ISOLATION — 500V
• OUTPUT VOLTAGE ADJUSTMENT STANDARD
• REMOTE SHUTDOWN
• 11 – 50V INPUT @ 5 WATTS OUTPUT
Package Dimensions
1" W x 1" L x .35" H
TYPICAL APPLICATION
DESCRIPTION
10nF
The DHC2812S and DHC2815S DC-DC converters pro-
vides 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 DHC2800S hybrid converter series utilizes all ceramic
capacitors,surfacemountmagnetics,andultrasonicallybonded
wires to provide reliable operation at all operating tempera-
tures while surviving G forces of up to 500 G.
8
4
1
+V
150K
VTRIM
2
3
6
DHC2800S
COMMON
–V
Control
System
5
7
RSP
SET UV
+5V
LOCKOUT
200K
VIN
5K
J174
SHUTDOWN
OPTO
OPERATION
NORMAL
(TTL)
The DHC2800S 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. However, the
DHC2800S may be ordered without this feature (/F option).
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
wideinputvoltagerange.Internalfilteringofoutputseliminates
the need for external capacitors in many applications.
The 8-pin DIP package (see Package Outlines) is hermeti-
callysealedandisolatedfromtheinternalcircuits.Heatsinking
is recommended for full power operation at elevated ambient
temperatures.
BLOCK DIAGRAM
6
1
2
P W M
FEED FORWARD
CONTROLLER
5
7
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
4
EXTERNAL CONNECTIONS
+ OUTPUT
OUTPUT COMMON
NO CONNECTION
1
2
3
4
5
8
7
6
CASE
TOP
VIEW
– INPUT
+ INPUT
ADJUST/COMP*
SHUTDOWN PLUS
* Optional N/C on DHC2800S/F
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DHC2812S • DHC2815S
DHC2812S
0 – 50Vdc
80V @ 50ms
450mA
–65°C, 150°C
300°C
DHC2815S
50Vdc
80V @ 50ms
360mA
–65°C, 150°C
300°C
INPUT VOLTAGE RANGE (Pin 7 to 6 or 5)
ABSOLUTE MAXIMUM RATINGS
INPUT TRANSIENT (Pin 7 to 6)
OUTPUT CURRENT (Continuous)
TEMPERATURE, Storage
TEMPERATURE, Pin Soldering 10s
SPECIFICATIONS
DHC2812S
DHC2815S
PARAMETER
TEST CONDITIONS1
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
STEADY STATE
CHARACTERISTICS
INPUT VOLTAGE RANGE
OUTPUT VOLTAGE
OUTPUT CURRENT –55°C
–55°C ↔ 125°C
Io = 10%
VIN = 16 ↔ 40
VIN = 11 ↔ 50
VIN = 16 ↔ 40
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
Vdc
Vdc
mAdc
mAdc
W
↔
125°C
OUTPUT POWER –55°C ↔ 125°C
VIN = 11 ↔ 50
W
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
Io= 100%
62
67
5
5
63
68
5
5
%
VIN = 11 ↔ 502
Po = 0-5.4W2
25
25
125
25
25
125
mV
mV
°C
–55
–55
0.006
340
45
0.006
340
45
%/°C
mArms
mArms
mVrms
µF
µF
W
mA
mA
Bandwidth = 10kHz → 1MHz
Bandwidth = 10kHz → 1MHz
Bandwidth = 10kHz → 1MHz
400
55
60
200
100
400
55
60
200
100
15
15
VIN = 16 ↔ 40
VIN = 11 ↔ 50
0.5
50
1.25
0.5
50
1.25
70
2.5
70
2.5
0.09
100
0.09
100
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
LEAKAGE CAPACITANCE
500 Vdc
10kHz
MΩ
pF
400
400
500
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE, 10µs rise
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 200 µF OUTPUT
CAPACITORS3
VIN = 16 ↔ 40Vdc, Io = 100%
200
200
200
200
mV
µS
VOLTAGE CHANGE
100
400
100
500
mV
µS
RECOVERY TIME (99%)
LOAD STEP RESPONSE, 10µs rise
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 200 µF OUTPUT
CAPACITORS3
Io= 50–100–50%
500
150
500
150
mV
µS
VOLTAGE CHANGE
100
500
0
250
40
100
600
0
250
40
mV
µS
mV
µS
RECOVERY TIME (99%)
START-UP OVERSHOOT
SHUTDOWN DELAY
VIN = 0 → 28 Vdc
Pin 5 = >10↔ <8 Vdc
Pin 5 = > 8↔ <10Vdc
500
60
500
60
SHUTDOWN RECOVERY
mS
NOTES:
1. Unless otherwise stated TC = 25°, VIN = 28V, Po = 5 watts,
2. Regulation measured on output pins 1/16" from case.
PACKAGE & THERMAL SPECIFICATIONS
MIN
TYP
MAX
UNITS
WEIGHT
14
17
30
GRAMS
°C
°C/W
TEMPERATURE RISE, junction to case
TEMPERATURE RISE, case to ambient
25
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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TYPICAL PERFORMANCE
GRAPHS
DHC2812S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
50
40
50
40
50
40
30%
40%
TEMP =
125°C
40%
TEMP = –55°C
TEMP = 25°C
50%
40%
50%
55%
56%
50%
55%
60%
63%
65%
60%
61%
64%
67%
64%
66%
30
30
30
66%
67%
20
10
20
11
20
10
69%
68%
68%
1.8
1
2
3
4
5
.18 .36
.72
1.08
1.44
1
2
3
4
5
OUTPUT POWER, POUT (W)
OUTPUT CURRENT, IOUT (A)
OUTPUT CURRENT, POUT (W)
LOW LINE DROP OUT
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE 200µF
16
15
VOUT
VOUT
14
450mA
13
12
11
450mA
LOAD
LOAD
225mA
225mA
NO OUTPUT BUS CAPCITANCE
INCLUDES 200µF ON OUTPUT BUS
10
0
1
2
3
4
5
6
OUTPUT CURRENT, POUT (W)
TIME, t (100µsec/DIV)
TIME, t (500µsec/DIV)
LINE TRANSIENT RESPONSE
TURN ON THRESHOLD
TURN ON RESPONSE
28
24
20
VOUT
OUTPUT LOAD = 450mA
IOUT = 450mA
12V
VOUT
VIN
40V
V
28V
IN
16
12
16V
INCLUDES 200µF
ON OUTPUT
0V
INCLUDES 4.7µf ON OUTPUT BUS
10K
30K 40K 60K 90K
20K
TIME, t (100µsec/DIV)
SET POINT RESISTOR, RSP (Ω)
AUDIO REJECTION
VIN = 28V
TIME, t (10msec/DIV)
0
–20
–40
–60
I
OUT = 450mA
–80
–100
1K
10K
100K
FREQUENCY, f (Hz)
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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TYPICAL PERFORMANCE
GRAPHS
DHC2815S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
50
40
50
50
40
30
40%
TEMP =
125°C
40%
40%
TEMP = –55°C
TEMP = 25°C
50%
50%
50%
56%
56%
40
30
61%
58%
60%
64%
62%
66%
65%
67%
30
68%
69%
20
10
20
10
20
10
68%
70%
72%
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
OUTPUT CURRENT, POUT (W)
OUTPUT CURRENT, POUT (W)
OUTPUT CURRENT, POUT (W)
LOW LINE DROP OUT
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE 200µF
16
15
VOUT
VOUT
14
13
12
11
360mA
LOAD
360mA
LOAD
180mA
180mA
NO OUTPUT BUS CAPCITANCE
INCLUDES 200µF ON OUTPUT BUS
10
0
1
2
3
4
5
6
OUTPUT CURRENT, POUT (W)
TIME, t (100µsec/DIV)
TIME, t (500µsec/DIV)
TURN ON THRESHOLD
TURN ON RESPONSE
OUTPUT LOAD = 360mA
15V
LINE TRANSIENT RESPONSE
28
24
20
VOUT = 360mA
VOUT
VOUT
40V
V
28V
IN
16V
16
12
VIN
INCLUDES 200µF
ON OUTPUT
0V
INCLUDES 4.7µF ON OUTPUT BUS
10K
30K 40K 60K 90K
20K
SET POINT RESISTOR, RSP (Ω)
TIME, t (100µsec/DIV)
TIME, t (10msec/DIV)
AUDIO REJECTION
0
–20
–40
–60
VIN = 28V
I
OUT = 360mA
–80
–100
1K
10K
100K
FREQUENCY, f (Hz)
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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TYPICAL PERFORMANCE
GRAPHS
DHC2812S • DHC2815S
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 k( 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 DHC2812S and DHC2815S may
be adjusted from 90% to 110% of nominal value by the use of
a 150k( potentiometer as shown. Adjustment beyond this
range is possible, however certain characteristics of the con-
verter such as but not limited to input voltage range, efficiency,
ripple and temperature performance will change. Character-
ization by the user is recommended in such applications.
LOAD FAULT RESPONSE
The Apex families of DC-DC converters share load fault
philosophies. Load fault conditions include short-circuit and
severe overload conditions. The DHC2800 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 over-
heating 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.
4
1
2
150K
10nF
Adjust/comp (pin 4) may be driven by external circuitry
referencedtopin2(-output)ifdesired. Groundingpin4causes
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 10K( or more if connection of the comp function
is also required.
V
o
O
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 DHC2812S and DHC2815S use pin 4 while the
DHC2803S and DHC2805S use pin 3.
I
o
O
SHUTDOWN PLUS
Pin 5 is used for remote shutdown, output fault detection,
and/orsettingtheinputvoltagepointatwhichtheconverterwill
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).
NORMAL
TIME
LOAD FAULT
NORMAL
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
resistorfrompin5to7. Aninput turnon/off hysteresis(typically
3.5%ofVin)willbeobserved. Thisshouldbeconsideredwhen
making or verifying set point adjustment. The value of the
setpoint resistor may be determined by the following:
210
10 3
*
R =
(+/– 10% accuracy at 25OC)
ETO – 9.5
Set point temperature coefficient is typically + 400ppm/OC
Output fault monitoring is accomplished by observing pin 5
with a high impedance monitoring circuit. Pin 5 voltage drops
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
DHC2812S/DHC2815SU REV. B JUNE © 1999 Apex Microtechnology Corp.
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