P r o d u c t I n n o v a t i o n F r o m

MP103

6

MP103U

CURRENT LIMIT

For proper operation, the current limit resistor (R

gram. For optimum reliability the resistor value should be set as high as possible. The value is calculated as follows;

with the maximum practical value of 30Ω. The current limit function can be disabled by shorting the I

pin.

R

POWER SUPPLY PROTECTION

Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The zeners

clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground.

Whether the zeners are used or not, the system power supply should be evaluated for transient performance in-

cluding power-on overshoot and power-off polarity reversal as well as line regulation. Conditions which can cause

open circuits or polarity reversals on either power supply rail should be avoided or protected against. Reversals or

opens on the negative supply rail is known to induce input stage failure. Unidirectional transzorbs prevent this, and

it is desirable that they be both electrically and physically as close to the amplifier as possible.

SERIES ISOLATION RESISTOR, R

S

To insure stability with all capacitive loads a series isolation resistor should be included between the output and the

load as shown in the external connections drawing. A 1Ω resistor works well for capacitive loads between 135pF

and 44nF. The resistor will affect the rise and fall time of the output pulse at the capacitive load. This can be com-

pensated for on the input signal.

BACKPLATE GROUNDING

The substrate of the MP103 is an insulated metal substrate. It is required that it be connected to signal ground. This

is accomplished when the ground pin (Pin 32) is properly connected signal ground.

CONTACTING CIRRUS LOGIC SUPPORT

For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.

For inquiries via email, please contact apex.support@cirrus.com.

International customers can also request support by contacting their local Cirrus Logic Sales Representative.

To find the one nearest to you, go to www.cirrus.com

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