IP1202 datasheet(21/29 Pages) IRF

No de pièce	IP1202

Description	Dual Output Full Function 2 Phase Synchronous Buck Power Block Integrated Power Semiconductors, PWM Control & Passives

PDF	29 Pages

Scroll/Zoom	100%

Fabricant	IRF [International Rectifier]

Site Internet	http://www.irf.com

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iP1202

Resistor R

6 of the compensation network is calcu-

lated according to equation (26)

(26)

It is recommended to set the channel 2 crossover

frequency 30% higher than the voltage loop cross-

over frequency.

The power stage of the current loop has a dominant

pole at frequency expressed by equation (27):

⋅

where, R

eq represents the total resistance of the

power stage that includes the Rdson of the FET

switches, the DC resistance of the inductor and the

shunt resistance, and is expressed by equation (28):

use 10mohm for FET Rdson.

To calculate for C11, place the zero frequency fz at

10 times the dominant pole frequency f

p using equa-

tion (29):

= 10

(28)

(27)

(29)

ramp

dson

Select

11 ≤

E/A2

iP1202

C11

sh1

Rsh2

Vsw1

Vsw2

Vp-Ref

CC2

Load

FB2

VOUT

Fig. 20: Output 2 error amplifier compensation net-

work for parallel configuration.

⋅

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