TPS40322_16 datasheet(31/47 Pages) TI1

Part #	TPS40322

Description	Dual Output or Two-Phase Synchronous Buck Controller

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Manufacturer	TI1 [Texas Instruments]

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100

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1000000

−60

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−135

−90

−45

0

45

90

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180

225

Frequency (Hz)

Gain

Phase

G001

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Frequency (Hz)

Gain

Phase

G001

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65

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85

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95

0

1

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7

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9

10

Output Current (A)

VIN = 8 V

VIN = 12 V

VIN = 15 V

VOUT = 1.2 V

G001

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95

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Output Current (A)

VIN = 8 V

VIN = 12 V

VIN = 15 V

VOUT = 1.8 V

G001

(

)

(

) (

)

(

)

UVLO(max)

UVLO set

UVLO hys

UVLO(on _ min)

UVLO(max)

V

1.25 V

R

68.1k

12.6k

12.7k

8.0 V 1.25 V

V

>

´

=

W

=

W »

W

-

(

)

( )

UVLO on

UVLO off

UVLO hys

UVLO

V

8 V

7 V

R

66.7k

68.1k

I

15 A

-

=

W »

W

m

TPS40322

www.ti.com

SLUSAF8E – JULY 2011 – REVISED JANUARY 2016

8.2.1.2.11.7

UVLO Programming Resistors (R1 and R3)

The UVLO hysteresis level is programmed by R1 with Equation 28 and Equation 29.

(28)

(29)

8.2.1.2.11.8

VDD Bypass Capacitor (C2)

As shown in the Pin Configuration and Functions section, use a 0.1-µF, 50-V, X7R capacitor for VDD bypass.

8.2.1.2.11.9

VBP6 Bypass Capacitor (C18)

Select a 3.3-µF (or greater) low ESR capacitor for BP6. For this design use a 3.3-µF, X5R ceramic capacitor.

8.2.1.3 Application Curves

Figure 24. Efficiency vs Load Current (8 V to 15 V to 1.2 V

Figure 25. Efficiency vs Load Current (8 V to 15 V to 1.8 V

at 10 A, Design Example 1)

Figure 26. Design Example 1 Loop Response

Figure 27. Design Example 1 Loop Response

VIN = 12 V, VOUT1 = 1.2 V, IOUT1 = 10 A, 80-kHz Bandwidth,

VIN = 12 V, VOUT2 = 1.8 V, IOUT2 = 10 A, 80-kHz Bandwidth,

50° Phase Margin

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