SBB503R3SCKA datasheet(3/11 Pages) IRF

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SBB SERIES

Single Output

Enable: An Enable pin is provided to remotely turn

the POL on or off. It can also be used for output

sequenceing for multiple SBB POL regulators. The

nominal threshold relative to the input return (pin 2)

is 2.5V. If 3.9 volts or greater are applied to the

Inhibit pin (pin 3) then the POL will operate normally.

The pin may be left open for normal operation. A

voltage of 0.4V or less will cause the SBB POL to

shut down.

Synchronization: An external synchronization port

is provided to allow the multiple SBB POLs to be

synchronized to an external frequency source to

minimize the noise interference coming from the

switching operation of the POLs. The synchronization

frequency ranges from 360 KHz to 440 KHz and the

synchronization signal port can be driven from 5V

logic.

The SBB Series POLs use a proven conservative

design methodology with careful incorporation of

known radiation performance devices and established

reliability components. All components are fully

derated to MIL-STD-1547. Standard design analyses

include stress, thermal, failure modes and effects

(FMEA), reliability & worst case and are available

upon request.

POK:The SBB POL also provides a power ok (POK)

output status signal at Pin 11. A logic high signal is

present when the POL’s output voltage is greater

than 95% of the nominal output voltage. A logic low

signal at Pin 11 indicates the POL’s output voltage

drops below the output voltage threshold of 95%

Remote Sense: Output pins 4 and 5 must be connected

to +Sense pin 6 for proper operation. The +Sense pin

may be connected remotely to the output line at the

load to compensate for a voltage drop in the output line

for precise optimum output regulation. The maximum

voltage compensation in combination with the output

voltage adjustment (if required) is limited to 10% of the

nominal output voltage.To enhance the load regulation

performance Input Return (Pin 2) may be connected

externally to Output Return (Pin 3).

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