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SLMA002 Datasheet(PDF) 20 Page - Texas Instruments

Part # SLMA002
Description  3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET AND EXTERNAL COMPENSATION
PDF  46 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SLMA002 Datasheet(HTML) 20 Page - Texas Instruments

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TPS55383
,, TPS55386
SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
The overall DC gain of the of the converter control-to-output transfer function is approximated by:
The next step is to find the desired gain of the error amplifier at the desired crossover frequency. Assuming a
single pole roll off, evaluate the following expression at the desired crossover frequency.
Figure 24. Loop Compensation Components
If operating at wide duty cycles (over 50%), a capacitor may be necessary across the upper resistor of the
voltage setting divider. (Ref Figure 24) If duty cycles are less than 50%, this capacitor may be omitted.
If a high ESR capacitor is used in the output filter, a zero appears in the loop response that could lead to
instability. To compensate, a small capacitor is placed in parallel with the lower voltage setting divider resistor
(Ref Figure 24). The value of the capacitor is determined such that a pole is placed at the same frequency as the
ESR zero. If low ESR capacitors are used, this capacitor may be omitted.
20
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS55383 TPS55386



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