MBRS130 データシートの表示（PDF） - Exar Corporation

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MBRS130

3A 18V Synchronous PFM/ PWM Step-Down Regulator

Exar Corporation 

XRP7 6 7 5

3 A 1 8 V Sy n ch r on ou s PFM/ PW M St ep - Dow n Reg u lat or

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w here R load is the output load resistance .

The uncompensated regulator has a constant

gain up to its pole frequency, beyond which

the gain decreases at - 20dB/decade. The zero

arising from the output capacitor ¶s ESR is

inconsequential if ceramic C OUT is used. This

simplifies the compensation. The RC and CC ,

which are placed between the output of

XRP7675 ¶V (UUAmRpUlifier and ground,

constitute a zero. The frequency of this

compensating zero is given by:

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For the typical application circuit,

RC= 13 NŸ

and CC= 4.7 nF provide a satisfactory

compensation . The XRP7675 can also be used

as a pin to pin upgrade replacement for

XRP766 5 based designs; in this instance, the

recommended RC network for XRP766 5,

RC=6 .8k and CC=3. 9nF, can be used with

satisfactory results with the XRP 7675 . Please

contact EXAR if you need assistance with the

compensation of your particular circuit.

TYPICAL APPLICATIONS

Fig. 18 : XRP7675 Typical Application Diagram - 12V to 3.3V Conversion

© 2013 Exar Corporation

10 / 12

Rev. 1.0.0

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