TPS40077PWPR datasheet(29/45 Pages) TI2

Part #	TPS40077PWPR

Description	TPS40077 4.5-V to 28-V Input, Voltage Mode, Synchronous Buck Controller With Voltage Feed Forward

PDF	45 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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29 / 45 page

COMP

TPS40077

OUT

PZ2

SET

PZ1

S0240-01

f − Frequency − kHz

−60

−50

−40

−30

−20

−10

G028

0.1

100

ESR Zero

Double Pole

ESR = 0.16

Ω

Slope = –20 dB/Decade

TPS40077

www.ti.com

SLUS714E – JANUARY 2007 – REVISED JUNE 2019

Product Folder Links: TPS40077

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These are shown in the Bode plot of Figure 29.

Figure 29. PWM and LC Filter Gain

The next step is to establish the required compensation gain to achieve the desired overall system response.

The target response is to have the crossover frequency between 1/9 and 1/5 times the switching frequency, in

order to have a phase margin greater than 45° and a gain margin greater than 6 dB.

A type-III compensation network, shown in Figure 30, was used for this design. This network gives the best

overall flexibility for compensating the converter.

Figure 30. Type-III Compensation With the TPS40077

A typical Bode plot for this type of compensation network is shown in Figure 31.

TPS40077PWPR Datasheet(PDF) 29 Page - Texas Instruments