AHE2815S Datasheet, PDF (5/8 Pages) International Rectifier – HYBRID-HIGH RELIABILITY DC/DC CONVERTER

+Input
1
Inhibit
Input
2
Sync
9
Input
Return
10
EMI
Filter
Drive 1
Pulse Width
Modulator ^FB
Drive 2
Block Diagram
AHE28XXS Series
Error
Amp &
Ref
5 +Vout
4
Output
Return
3 V_ADJ
Application Information
Device Synchronization
Inhibit Function
Connecting the inhibit input (Pin 2) to input common (Pin 10)
will cause the converter to shut down. It is recommended
that the inhibit pin be driven by an open collector device
capable of sinking at least 400µA of current. The open
circuit voltage of the inhibit input is 11.5 ± 1.0VDC.
EMI Filter
An EMI filter (AFC461), available as an option, will reduce
the input ripple current to levels below the limits imposed by
MIL-STD-461B CEO.
Whenever multiple DC/DC converters are utilized in a
single system, significant low frequency noise may be
generated due to slight difference in the switching
frequencies of the converters (beat frequency noise).
Because of the low frequency nature of this noise
(typically less than 10KHz), it is difficult to filter out and
may interfere with proper operation of sensitive systems
(communications, radar or telemetry). Intenational
Rectifier offers an option, which provides synchronization
of multiple AHE/ATW/ATO type converters, thus
eliminating this type of noise.
Output Voltage Adjustment (AHE2805 only)
The output voltage of the AHE2805S converter can be
adjusted upward by connecting an appropriate resistor
between Output Adjust (Pin 3) and Output Common
(Pin 4) as shown in Table 1 below.
Table 1 Output adjustment resistor values
: Resistance Pin 3 to 4 ( )
None
390K
145K
63K
22K
0
Output Voltage Increases (%)
0
+1%
+2%
+3%
+4%
+5%
Typical Synchronization Connection
+ In
Return
AFC461
or
AFV461
Output
Return
+ In
Output
AHE28xxS
Case
- MSTR
Return
Return
MSTR
System
Bus
+ In
+Output
AHE28xxD
Case
Return
-SLV
Return
-Output
SLV
+ In
Output
AHE28xxS
Case
-SLV
Return
Return
SLV
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