TPS40140RHHR datasheet(43/68 Pages) TI1 | Dual or 2-Phase, Stackable Controller

Part No.	TPS40140RHHR

Description	Dual or 2-Phase, Stackable Controller

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Manufacturer	TI1 [Texas Instruments]

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43 / 68 page

RAMP

e qv

PK

SH

PH

IN

RAMP

LIM

IN

V

DCR

Ac I

V

2 N

V

R2

510k

V

I

V

´

+

´

=

W

´

RAMP

e qv

PK

SH

PH

IN

RAMP

LIM

IN

V

DCR

Ac I

V

2 N

V

R1

22.5k

V

(1

) I

V

´

+

´

=

W

-

´

(eqv)

R2

DCR

=

× DCR =

R1+ R2

2

IN

(eqv)

ramp

sw

V × Ac

L

>

DCR

2 × V

× f

R1

R2

11.6 k

=

L

R1//R2

5.8 k

DCR

C1

=

´

BIAS

OUT

R1

R

= 0.7 ×

= 8.75 k

V

- 0.7

(

)

1.058

PH

3

R

1.33

39.2 10

ƒ

7 ,

-

=

´

-

P

SRtot + PSRcond ) PDIODE + 1.47 W

TPS40140

www.ti.com

SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015

(35)

9.2.1.2.5

Step 5: Peripheral Component Design

9.2.1.2.5.1

Switching Frequency Setting (RT Pin 5)

(36)

In the design, a 62-k

Ω resistor is selected. The actual switching frequency is 510 kHz.

9.2.1.2.5.2

Output Voltage Setting (FB1 Pin 36)

Substitute R1 with 10 k

Ω and then calculate RBIAS.

(37)

9.2.1.2.5.3

Current Sensing Network Design (CS1 Pin 31 and CSRT1 Pin 32)

For small pulse width, to avoid the sub-harmonics brought by the loop delay, a resistor divider is usually used to

attenuate the current feedback information as described in the Inductor DCR Current Sense section.

Choosing C1 a value for 0.1-

μF, and let R1 and R2 be equal, calculating R1 and R2 with Equation 38 and

Equation 39. In this design, R1 and R2 are 10 k

Ω.

(38)

(39)

A simplified equation to determine if the design produces sub-harmonics is shown in Equation 40.

(40)

(41)

In this design, a 1-

μF capacitor is placed at the CSRT1 pin for the purpose of eliminating noise. It can be

removed without degrading performance.

9.2.1.2.5.4

Overcurrent Protection (ILIM1 Pin 34)

The resistor selection equations in the CALCULATING OVERCURRENT PROTECTION LEVEL section are

simplified to calculate the over current setting resistors. Set the DC over current rating at 30 A.

(42)

where

•

AC is the gain transfer to comparator (typ 12.5)

•

VRAMP is the ramp amplitude (typ 0.5 V)

•

VSH is the VSHARE reference voltage (typ 1.8 V)

•

ILIM is the current limit output current (typ 20 µA)

•

NPH is 6 if VPHSEL = 1.6 V ±0.2 V, otherwise NPH = 8

(43)

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