L5953_07 datasheet(28/31 Pages) STMICROELECTRONICS

Il numero della parte	L5953

Spiegazioni elettronici	Multiple switching voltage regulator

PDF	31 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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28 / 31 page

Application note

L5953

28/31

1. Fix the cross-over frequency fC of the overall loop gain. Usually:

where fsw,min is the minimum switching frequency

2. Calculate the high frequency error amplifier gain

3. Chose R3 and calculate

The value for R3 has not to be very high (for example 10K

Ω) so to limit the error due to an

error amplifier input offset current.

4. Calculate

5. Finally calculate

and

0.1 f

sw,min

⋅

0.25 f

c 2 π

ESR

-------------

⋅

⋅⋅⋅

L1 C7

⋅

-----------------------

⋅

ESR

-------------

--------

⋅

⎝⎠

⎛⎞

–

---------------------------------------------

ref PWM

--------------------------

⋅

ref,PWM

-------------------------

–

----------------------------------

C R1

⋅

L1 C7

⋅

-----------------------

⋅

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