SBB501R5SCKC datasheet(2/11 Pages) IRF

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SBB SERIES

Single Output

Circuit Description

The SBB Series POLs utilize a non-isolated buck

circuit design topology with synchronous output

rectification to maximize efficiency. The nominal

switching frequency is 400 KHz. An internal EMI filter

minimizes the reflected switching ripple current to

meet most space applications at the system level. A

two-stage output filter reduces the output ripple and

noise to a very low level required by today’s digital

loads. No external filter capacitors are required for

typical design applications.

Output current is limited under any load fault

condition. It is designed to behave similar to a

constant current source with the output voltage

dropping below nominal. The SBB POL will resume

normal operation when the load current is reduced

below the current limit point. This protects the POL

from both overload and short circuit conditions.

The current limit threshold exhibits a negative

temperature coefficient to reduce the possibility of

thermal runaway.

Undervoltage Lockout (UVLO): An UVLO circuit

prohibits the POL from operating when the line

voltage is too low to maintain the output voltage.

The POL will not start until the line input voltage

rises to approximately 4.3 volts and will shut down

when the input voltage drops below 3.9 volts.

The product’s package footprint is less than three

square inches. The package and lid materials are

cold rolled steel. The low profile package measures

1.9"L x 1.5"W x 0.335"H, excluding mounting tabs

and input/output (I/O) pins. The ceramic sealed I/O

pins protrude the package’s side walls with the

mounting tabs on the corners of the side walls. The

I/O pins are copper Alloy 52. The pins are gold plated

for long term storage. Gold is to be removed prior to

assembly. A complete POL weighs less than 60

grams. Cooling of this device can be accomplished

by bonding the base of the package to a metal plate

or heat sink with a thermally conductive material.

The package’s mechanical outline and I/O pins

functional assignment are included in this data sheet.

The SBB POLs are designed, manufactured, tested,

and qualified at IR’s facility in San Jose, California

which is qualified to ISO9001 and MIL-PRF-38534

by DSCC. Flight hardware is 100% screened and

fully compliant to class K per MIL-PRF-38534.

Abbreviated screening version or engineering model

(EM) of the SBB is available for engineering evaluation.

Please refer to the Device Screening table for details.

Output Voltage Adjustment: The output voltage

(Vout) of an SBB can be adjusted to ±10% of a

nominal output voltage. One external resistor with

a power rating of > 0.125 watt is required for this

function.

Following is the formula to determine an approximate

value of the resistor and how it needs to be

connected to the functional pins for a higher and a

lower output voltage with respect to the nominal

output voltage.

To reduce Vout, connect an adjust resistor to

Vadjust pin and Output pin

⎪

⎭

⎪⎪

⎬

⎫

⎪

⎩

⎪⎪

⎨

⎧

−

Vnom

Vout

Vnom

Vout

Radj

10280

11280

To increase Vout, connect an adjust resistor to

Vadjust pin and Output Return pin

⎪

⎭

⎪⎪

⎬

⎫

⎪

⎩

⎪⎪

⎨

⎧

−

Vnom

Vout

Vnom

Vout

Radj

10280

9280

Where:

Radjust is the value of the adjust resistor in Ohms(

Ω)

Vnom is the nominal output voltage of the SBB

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