TPS40322RHBT datasheet(28/47 Pages) TI1

Part #	TPS40322RHBT

Description	Dual Output or Two-Phase Synchronous Buck Controller

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(

)

(

)

(

)

1

OUT1(max)

RIPPLE1

CHARGE

L1 peak

2

I

10 A

2.5A

0.281A

11.53 A

=

+

´

+

=

+

´

+

=

(

)

OUT1

CHARGE

SS

1.2 V

2

220 F

2

10 F

2

3.3 F

1 F

V

C

I

0.281A

t

2ms

´

m + ´

m + m

´

=

RIPPLE1

RIPPLE(cap)

OUT1

SW

MAX

RIPPLE1

I

2.5 A

V

24mV

V

8 C

f

8 458 F 500kHz

ESR

9m

I

2.5 A

æ

ö

æ

ö

-

ç

÷

ç

÷

-

´

m ´

è

ø

è

ø

=

W

(

)

2

OUT1

OUT1(min)

OUT

OVER1

I

L1

5

0.88 H

C

458 F

V

1.2 40mV

D

´

m

=

m

´

(

)

(

)

2

OUT1

UNDER1

OUT1

IN

OUT1

IN

OUT1

I

L1

I

L1

V

t

C

V

C

D

´

D

´

<

´ D =

´

=

-

´

(

)

D

´

D

´

<

´ D =

´

=

´

2

OUT1

OVER1

OUT1

I

L1

I

L1

V

t

C

V

C

TPS40322

SLUSAF8E – JULY 2011 – REVISED JANUARY 2016

www.ti.com

8.2.1.2.3

Output Capacitor Selection (C10 through C16)

The selection of the output capacitor is typically driven by the output transient response requirement. Equation 10

and Equation 11 over-estimate the voltage deviation to account for delays in the loop bandwidth and can be used

to determine the required output capacitance:

(10)

(11)

When VIN(min) > 2 x VOUT1, use the overshoot equation, VOVER1, to calculate minimum output capacitance. When

VIN(min) < 2 x VOUT1 use Equation 11, VUNDER1, to calculate minimum output capacitance. In this design example,

VIN(min) is much larger than 2 x VOUT1 so Equation 12 is used to determine the required minimum output

capacitance.

(12)

With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is

approximated by Equation 13.

(13)

Two 220-µF, 4-V, aluminum electrolytic capacitors were chosen for load response requirements. Additionally two

0805 10-µF, X7R, along with two 0603, 3.3-µF X5R, and one 1-µF, X5R ceramic capacitors are selected for low

ESR and high frequency decoupling.

8.2.1.2.4

Peak Current Rating of Inductor

With the output capacitance known, it is possible to calculate the charge current during start-up and determine

the minimum saturation current rating for the inductor. The start-up charging current is approximated using

Equation 14.

(14)

(15)

Table 5. Inductor Requirements Summary

PARAMETER

VALUE

UNIT

L1

Inductance

0.88

µH

IL1_RMS

RMS current (thermal rating)

10.026

A

IL1_PEAK

Peak current (saturation rating)

11.53

A

A 744314110 from Wurth Electronics with 1.1-µH zero current inductance is selected. Inductance for this part is

0.88-µH at 10-A bias. This 15-A, 3.15-m

Ω inductor exceeds the minimum inductor ratings in a 7-mm x 7-mm

package.

8.2.1.2.5

Input Capacitor Selection (C3 through C6)

The input voltage ripple is divided between the capacitance and ESR of the input capacitor. For this design

VRIPPLE(cap) = 200 mV and VRIPPLE(esr) = 50 mV. The minimum capacitance and maximum ESR are estimated

using Equation 16.

28

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