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XR76203ELTR-F Datasheet(PDF) 15 Page - Exar Corporation

Part No. XR76203ELTR-F
Description  3A/5A/8A Synchronous Step Down COT Regulator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR76203ELTR-F Datasheet(HTML) 15 Page - Exar Corporation

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Rev 1A
Feed-Forward Capacitor (CFF)
A feed-forward capacitor (CFF) may be necessary depend-
ing on the Equivalent Series Resistance (ESR) of COUT. If
only ceramic output capacitors are used for COUT then a
CFF is necessary. Calculate CFF from:
where:
R1 is the resistor that CFF is placed in parallel with
fLC is the frequency of output filter double-pole
fLC frequency must be less than 11kHz when using ceramic
COUT. If necessary, increase L and/or COUT in order to meet
this constraint.
When using capacitors with higher ESR, such as PANA-
SONIC TPE series, a CFF is not required provided following
conditions are met:
1. The frequency of output filter LC double-pole fLC should
be less than 11kHz.
2. The frequency of ESR Zero fZero,ESR should be at least
five times larger than fLC.
Note that if fZero,ESR is less than 5xfLC, then it is recom-
mended to set the fLC at less than 2kHz. CFF is still not
required.
Maximum Allowable Voltage Ripple at FB pin
Note that the steady-state voltage ripple at feedback pin FB
(VFB,RIPPLE) must not exceed 50mV in order for the Regula-
tor to function correctly. If VFB,RIPPLE is larger than 50mV
then COUT should be increased as necessary in order to
keep the VFB,RIPPLE below 50mV.
Feed-Forward Resistor (RFF)
Poor PCB layout can cause FET switching noise at the out-
put and may couple to the FB pin via CFF. Excessive noise
at FB will cause poor load regulation. To solve this problem
place a resistor RFF in series with CFF. RFF value up to 2%
of R1 is acceptable.
CFF
1
2
 R17 fLC
-------------------------------------------------
=


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