PIFE32251B-R68MS datasheet(129/157 Pages) TI1

129 / 157 page

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8176 × :8+0 F 8176 ;

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Controller

DRVHVRx

DRVLVRx

VBSTVRx

SWVRx

FBVRxP

FBVRxN

PGNDVRx

Vout

Cin

VIN

0.1 PF

Cout

Lout

ILIMVRx

Rcs

VREGVRx

1 PF

LDO5V

ENVRx

PGVRx

129

TPS650830

www.ti.com

SLVSCF4A – DECEMBER 2014 – REVISED JULY 2016

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Product Folder Links: TPS650830

Application and Implementation

7.2.1

Design Requirements

The TPS65083x requires decoupling caps on the supply pins. Refer to the Electrical Characteristics for

recommended capacitance on these supplies.

The controllers, converter, LDO, and some other features can be adjusted to meet the application needs.

The following describes how to design and adjust the external components to achieve desired

performances.

7.2.2

Detailed Design Procedure

7.2.2.1

Controller Design Procedure

Designing the controller breaks down into several steps: designing the output filter, selecting the FETs,

bootstrap capacitor, and input capacitors and setting the current limits.

Controllers VR1 and VR4 require VREG supply and capacitors. VREG should be connected to the 5-V

LDO and a 1-µF, X5R, 20%, 10-V or similar capacitor should be used for decoupling.

Figure 7-2. Controller Diagram

7.2.2.1.1 Selecting the Inductor

An inductor is required to be placed between the external FETs and the output capacitors. The inductor

and output capacitors together make the double-pole which contributes towards stability. In addition, the

inductor is directly responsible for the output ripple, efficiency, and transient performance. With an

increase in inductance used the ripple current decreases which, typically increases efficiency. However,

with an increase in inductance used, the transient performance decreases. Finally, the inductor selected

has to be rated for appropriate saturation current, core losses, and DC resistance (DCR).

Use the equation below to calculate the recommended inductance for the controller. Let KIND be the ratio

of ILripple to the IoutMAX. It is recommended that KIND is set to a value between 0.2 and 0.4.

(1)

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