TPS54010_16 datasheet(11/30 Pages) TI1

Part #	TPS54010

Description	2.2 ??4 -V, 14-A OUTPUT SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs

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I

CIN +

I

OUT(MAX)

2

(3)

SWITCHING FREQUENCY

OUTPUT FILTER COMPONENTS

R4(kW) +

500 kHz

ƒs(kHz)

100 kW

(1)

Inductor Selection

INPUT CAPACITORS

L

MIN +

V

OUT

V

in(MAX) *

V

OUT

V

IN(MAX)

K

IND

I

OUT

Fsw

(4)

DVPVIN +

I

OUT(MAX)

0.25

C

BULK

ƒsw )

I

OUT(MAX)

ESR

MAX

I

L(RMS) +

I2

OUT(MAX) )

1

12

V

OUT

V

in(MAX) *

V

OUT

V

IN(MAX)

L

OUT

Fsw

0.8

2

TPS54010

SLVS509B – MAY 2004 – REVISED JUNE 2005

(continued)

DESIGN PARAMETER

EXAMPLE VALUE

Operating frequency

700 kHz

In this case, the input ripple voltage would be 155 mV

and the RMS ripple current would be 7 A. The

maximum voltage across the input capacitors would

be Vin max plus delta Vin/2. The chosen bulk

The switching frequency can be set to either one of

capacitor, a Sanyo POSCAP 6TPD330M is rated for

two internally programmed frequencies or set to a

6.3 V and 4.4 A of ripple current; two bypass

externally programmed frequency. With the RT pin

capacitors, TDK C3225X5R1C106M are each rated

open, setting the SYNC pin at or above 2.5 V selects

for 16 V, and the ripple current capacity is greater

550-kHz operation, whereas grounding or leaving the

than 3 A at the operating frequency of 700 kHz. Total

SYNC pin open selects 350-kHz operation. For this

ripple current handling is in excess of 10.4 A. It is

design, the switching frequency is externally pro-

important that the maximum ratings for voltage and

grammed using the RT pin. By connecting a resistor

current are not exceeded under any circumstance.

(R4) from RT to AGND, any frequency in the range of

250 to 700 kHz can be set. Use Equation 1 to

determine the proper value of RT.

Two components need to be selected for the output

filter, L1 and C2. Because the TPS54010 is an

externally compensated device, a wide range of filter

In this example circuit, R4 is calculated to be 71.5 k

Ω

component types and values can be supported.

and the switching frequency is set at 700 kHz.

To calculate the minimum value of the output induc-

The TPS54010 requires an input de-coupling capaci-

tor, use Equation 4

tor and, depending on the application, a bulk input

capacitor. The minimum value for the de-coupling

capacitor, C9, is 10 µF. A high-quality ceramic type

X5R or X7R is recommended. The voltage rating

should be greater than the maximum input voltage.

Additionally, some bulk capacitance may be needed,

KIND is a coefficient that represents the amount of

especially if the TPS54010 circuit is not located within

inductor ripple current relative to the maximum output

about 2 inches from the input voltage source. The

current. For designs using low ESR output capacitors

value for this capacitor is not critical but it also should

such as ceramics, use KIND = 0.3. When using higher

be rated to handle the maximum input voltage includ-

ESR output capacitors, KIND = 0.2 yields better

ing ripple voltage, and should filter the output so that

results.

input ripple voltage is acceptable.

For this design example, use KIND = 0.2 to keep the

This input ripple voltage can be approximated by

inductor ripple current small. The minimum inductor

Equation 2:

value is calculated to be 0.44 µH.

For the output filter inductor, it is important that the

RMS current and saturation current ratings not be

exceeded. The RMS inductor current can be found

(2)

from Equation 5:

Where IOUT(MAX) is the maximum load current.

The TPS54010 requires an input de-coupling capaci-

tor and, depending on the application, a bulk input

capacitor.

ƒ

sw is the switching frequency, C(BULK) is

(5)

the bulk capacitor value and ESRMAX is the maximum

series resistance of the bulk capacitor.

and the peak inductor current can be found from

Equation 6

The maximum RMS ripple current also needs to be

checked. For worst-case conditions, this can be

approximated by Equation 3:

11

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