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PM6641 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

tên linh kiện PM6641
Giải thích chi tiết về linh kiện  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
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PM6641 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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PM6641
Device description
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In order to obtain the typical integrative loop transfer function the signal stage must
compensate for the power stage pole (due to the output capacitor and the load) and zero
(above the loop bandwidth if ceramic output capacitors are selected). The signal stage
transfer function is:
Equation 2
Where gM is the power stage transconductance, KL is a design parameter and α is the gain
due to the output resistor divider (0.8V / Vout). The external compensation network (Rc, Cc
and CRO) introduces:
●
One zero, to compensate the power stage pole:
●
One pole in order to delete the static output voltage error;
●
One pole, if necessary, in order to compensate the high frequency zero due to the
output capacitor ESR:
The control loop gain is obtained by multiplying G(s) by H(s):
Equation 3
This model provides good results if the control loop cut-off frequency fCO is lower than about
fsw/10.
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