©Lambda Advanced Analog
The information in this data sheet has been carefully checked and is believed to be accurate; however no
responsibility is assumed for possible errors. These specifications are subject to change without notice.
9848
LAMBDA ADVANCED ANALOG INC. λ MIL-PRF-38534 Certified
ISO9001 Registered
2270 Martin Avenue
Santa Clara CA 95050-2781
(408) 988-4930 FAX (408) 988-2702
8
APPLICATION INFORMATION
Inhibit function
Connecting the inhibit pin (Pin 2 of single and dual
models, pin 8 of triple models) to the input return (Pin 10)
will cause the converter to shut down and operate in a low
power standby mode. Power consumption in this mode is
calculated by multiplying Vin times the input current
inhibited, typically 225mw at Vin equal to 28 volts. The
input current inhibited is relatively constant with changes
in Vin. The open circuit inhibit pin voltage is typically
11.5 volts and can be conveniently driven by an open
collector driver. An internal pullup resistor enables the
user to leave this pin floating if the inhibit function is not
used in their particular application.
All models use
identical inhibit internal circuits. Forcing inhibit pin to
any voltage between 0 and 6 volts will assure the
converter is inhibited.
The input current to this pin is
500
µa maximum at Vpin2 = to 0 volts. The converter can
be turned on by opening Pin 2 or forcing a voltage from
10 to 50 volts. Inhibit pin current from 10 to 50 volts is
less than ±50
µa.
EMI Filter
An optional EMI filter (AFC461) will reduce the input
ripple current to levels below the limits imposed by MIL-
STD-461 CEO3
*Output Adjust (Single Output Models Only)
The output voltage of the AHV28XXS can be adjusted
upward by connecting Output Adjust (Pin 3) and Output
Common (Pin 4) as shown in Table 1.
Resistance, ohm
Pin 3 to 4
Output Voltage Increase, %
5V
12V
15V
x
0
0
0
390 K
+1.0 %
+1.6%
+1.7 %
145 K
+2.0 %
+3.2 %
+3.4 %
63 K
+3.1 %
+4.9 %
+5.1 %
22 K
+4.1 %
+6.5 %
+6.8 %
0
+5.0 %
+7.9 %
+8.3 %
Table 1: Output Adjustment Resistor Values
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