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MHF+2812S/883 参数 Datasheet PDF下载

MHF+2812S/883图片预览
型号: MHF+2812S/883
PDF下载: 下载PDF文件 查看货源
内容描述: MHF +单路,双路和三路DC / DC转换器 [MHF+ Single, Dual and Triple DC/DC Converters]
分类和应用: 转换器输入元件
文件页数/大小: 20 页 / 432 K
品牌: CRANE [ Crane Aerospace & Electronics. ]
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Crane Aerospace & Electronics Power Solutions
MHF+ Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 15 WATT
F
EATURES
–55° to +125°C operation
16 to 40 VDC input (16 to 48 VDC triple)
Fully isolated
Optocoupler feedback
Fixed frequency 550 kHz typical
- 450 kHz triple models
Topology
- Single and dual: Single Ended Forward
- Triple: Current Mode Flyback
Transient protection
- Single and dual: 50 V/50 ms
- Triple: 80 V/120 ms
Inhibit and sync functions
Indefinite short circuit protection
Undervoltage lockout
Up to 84% efficiency, 28 W/in
3
-
Up to 76% efficiency triple models
MODELS
VDC O
UTPUT
SINGLE
DUAL
TRIPLE
3.3
±5
+5 & ±12
5
±12
+5 & ±15
5.2
±15
12
15
28
MHF+ SERIES™ SINGLE & DUAL
DC/DC CONVERTERS
The MHF+ Single and Dual Series™ of high frequency DC/DC
converters offers a wide input voltage range of 16 to 40 volts and up
to 15 watts of output power. The units are capable of withstanding
short term transients up to 50 volts. The package is a hermetically
sealed, welded metal case. Flanged and non-flanged models are
available.
H
IGHER
P
OWER
D
ENSITY
The MHF+ Series offers a new standard of performance for small
size and high power density. At just 0.33 inch high and a total foot-
print of 1.7 in
2,
this low profile package offers a total power density
of up to 28 watts per cubic inch.
C
ONVERTER
D
ESIGN
The MHF+ converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a constant
switching frequency of 550 kHz. Isolation between input and output
circuits is provided with a transformer in the forward path and a
temperature compensated optical link in the feedback control loop.
For the MHF+ dual output models, good cross regulation is main-
tained by tightly coupled output magnetics. Up to 90% of the total
output power (80% on 2805D) is available from either output,
providing the opposite output is simultaneously carrying 10% of the
total output power (20% on 2805D models). Predictable current limit
is accomplished by directly monitoring the output load current and
providing a constant current output above the overload point.
L
OW
N
OISE
, H
IGH
A
UDIO
R
EJECTION
The MHF+ converters’ feed-forward compensation system provides
excellent dynamic response and noise rejection. Audio rejection is
typically 50 dB. Typical output voltage response for a 50% to 100%
step load transient is as low as 1.3% with a 150 msec recovery time.
Input ripple current is typically 35 mA p-p with output ripple voltage
typically 30 mV p-p .
I
NHIBIT
F
UNCTION
MHF+ converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low quies-
cent input current. The converter is inhibited when a TTL compatible
low (≤0.8 – output disabled) is applied to the inhibit pin. The unit is
enabled when the pin, which is internally connected to a pull-up
resistor, is left unconnected or is connected to an open-collector
gate. The open circuit output voltage associated with the inhibit pin
is 8.5 to 12 V. In the inhibit mode, a maximum of 4 mA must be sunk
from the inhibit pin.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • electronics@craneae.com
www.craneae.com
Page 1 of 20
Rev K - 20060613