ISR2805DKSRH データシートの表示（PDF） - M.S. Kennedy

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ISR2805DKSRH

RADIATION HARDENED HIGH-POWER, HIGH EFFICIENCY DC-DC POWER CONVERTER

M.S. Kennedy 

APPLICATION NOTES

ISR2800D PIN DESCRIPTIONS

PRI INHIBIT - Allows on/off control from circuits referenced to the input return. Main and auxiliary outputs

are on when this pin is left open and off when this pin is shorted to input return.

ETERM - Allows control of PRI Inhibit pin in electrically noisy environments. This pin bypasses the internal

EMI filter to the internal ground reference and must be isolated. Connecting this pin to the PRI inhibit will

disable the unit.

INPUT - Input power terminals to connect to primary power source. All of these pins must be connected by

the user.

INPUT RTN - Input power terminals to connect to primary power source. All of these pins must be con-

nected by the user.

SEC ON/OFF - Allows on/off control from circuits referenced to the output return. +Vout and -5Vout

outputs are on when this pin is left open. +Vout is off when this pin is shorted to output return.

SYNC OUT - Allows user to synchronize other devices to the operating frequency of the converter. This AC

coupled pin can drive up to 50Ω with an output level of 3.4V.

SYNC IN - Allows user control of the converter operating frequency within a limited range. If unused,

connect to output return, or leave open. This pin has an input impedance of 50Ω.

CROW BAR - Allows user control to ensure proper voltage sequencing during fault conditions. This com-

mand may be used to activate a crowbar circuit on the main output to guarantee proper power down

sequencing. This output should normally be buffered (e.g. to drive the gate of a FET) in timing critical

sequencing applications. For non-critical timing or high impedance input devices, it may be used directly.

Otherwise, it should be left open.

-5VOUT - Provides 2.5W of negative five volt, low noise bias power.

SEC RTN - Output power return terminals to connect to isolated secondary loads. This is the return ground

reference for both the outputs. All of these pins must be connected by the user.

+VOUT - Main adjustable output voltage. Output power terminals connect to isolated secondary loads.

This output is adjustable from 3.3V to 5V. All of these pins must be connected by the user.

REM SENSE - Remote sense allows user to connect to a remote location near the load for point of regulation.

This overcomes a limited amount of voltage drop in the distribution network. Otherwise, connect this pin to

the +Vout output.

VOUT ADJ - Allows adjustment of the +Vout voltage over the allowable range using an external resistor

from this pin to the output return.

VOUT OVP ADJ - Allows adjustment of the over-voltage protection (OVP) threshold to match the (adjust-

able) main output voltage. Threshold is adjusted by connecting a resistor from this pin to the output return.

5

PRELIMINARY

Rev. - 3/01

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