TPS40322_16 datasheet(15/47 Pages) TI1

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TPS40322 Datasheet(PDF) 15 Page - Texas Instruments

Part #	TPS40322

Description	Dual Output or Two-Phase Synchronous Buck Controller

PDF	47 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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15 / 47 page

R1 C1

DCR

CS1–

CS1+

VOUT1

VIN

UDG-11112

TPS40322

www.ti.com

SLUSAF8E – JULY 2011 – REVISED JANUARY 2016

Feature Description (continued)

7.3.4 Current Sensing

The TPS40322 uses a differential current sense design to sense the output current. The sense element can be

the series resistance of the power stage filter inductor or a separate current sense resistor. When using the

inductor series resistance as shown in Figure 16, an R-C filter must be used to remove the large AC component

voltage across the inductor so that only the component of the voltage that remains is across the resistance of the

inductor (see Figure 16).

The values of R1 and C1 for an ideal design can be calculated using Equation 2. The time constant of the R-C

filter must equal the time constant of the inductor itself. If the time constants are equal, the voltage across C1

equals the current in the inductor multiplied by the inductor resistance. The inductor ripple current is reflected in

the voltage across C1. Typically a capacitor with a value of 0.1-µF is recommended for C1.

Refer to the Layout section for proper placement of the sensing elements.

Figure 16. Inductor DCR Current Sensing

(2)

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Product Folder Links: TPS40322

Manufacturer	Part #	Datasheet	Description
Texas Instruments	TPS40322	1Mb / 42P	Dual Output or Two-Phase Synchronous Buck Controller

Manufacturer	Part #	Datasheet	Description
Texas Instruments	TPS5120	291Kb / 20P	DUAL OUTPUT, TWO PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
Semtech Corporation	SC2443	1Mb / 22P	Dual-Phase Single or Two Output Synchronous Step-Down Controller
Texas Instruments	TPS40322	1,023Kb / 40P	Dual Output or Two-Phase Synchronous Buck Controller
	TPS40422	965Kb / 54P	Dual-Output or Two-Phase Synchronous Buck Controller with PMBus
	TPS5120-EP	483Kb / 23P	DUAL OUTPUT, TWO-PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
	TPS5120-Q1	325Kb / 21P	DUAL OUTPUT, TWO-PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
	TPS5120	858Kb / 24P	DUAL OUTPUT,TWO-PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
	TPS40322	1Mb / 42P	Dual Output or Two-Phase Synchronous Buck Controller
	TPS5120	840Kb / 23P	DUAL OUTPUT, TWO-PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
	TPS40422	2Mb / 71P	Dual-Output or Two-Phase Synchronous Buck Controller with PMBus Interface

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