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3

AME28461 Series

Block Diagram

Refer to last page for Pin Designation

Circuit Operation and Application Information

The AME series of filters employ three stages of

filtering in a low pass configuration designed to

attenuate the higher frequency components of ripple

currents generated by high frequency switching DC-

DC converters. The Block Diagram describes the

general arrangement of the principal elements which

have been connected to provide both differential and

normal mode buffering between the input and output

terminals.

When a single AME filter is used in conjunction with

multiple DC-DC converters, the use will be limited to

the maximum output current capability specified in

utilizing one filter to drive two converters is illustrated

on page 1.

1

To calculate the input current (iin) requirement of any one converter, first determine the maximum output power by

multiplying output voltage by maximum load current, divide this power by the efficiency to obtain input power and then divide

input power by input voltage to obtain the input current (iin). Note that to obtain worst case input current, you must use

maximum load current, minimum efficiency and minimum line voltage in this calculation.

7

12

1

6

22 µF

11 µF

20 nF

20 nF

Case

Output

Output

Return

Input

Input

Return

2

3

5

4

11

10

8

9

Employing only passive elements, AME filter

operation is initiated simply by insertion into the input

power path between one or more DC-DC converters

and their input DC voltage bus. In this connection,

output pins of the filter will be connected to input

pins of the converters.

Although expressly designed to complement the AFL

series of DC-DC converters, when operated within

their specified limits the AME filters can be

successfully operated in conjunction with other

converters in the Advanced Analog line including

the ASA, AHF, AHV and ATR series.