PFM/PWM

Control Logic

Current Limit

Logic

_

+

Compensation

Soft

Start

Slope Compensation

PFM/PWM

Mode Select

PFM/PWM

Comparator

Error Amplifier

_

+

Current

Sense

Driver

Shoot-Through

Logic

_

+

Undervoltage

Lockout

Bias Supply

10

Ω

_

+

R2

R1

R1 + R2

≈ 1 MΩ

Power Good

Sync

+

Oscillator

_

+

Load Comparator

Current Sense

+

Offset

Antiringing

FB

N-Channel

Power MOSFET

P-Channel

Power MOSFET

L

PGND

EN

FB

PG

FC (See Note B)

GND

SYNC

ILIM

EN

(See

Note A)

TPS62000, TPS62001, TPS62002, TPS62003

TPS62004, TPS62005, TPS62006, TPS62007, TPS62008

www.ti.com

SLVS294F – SEPTEMBER 2000 – REVISED AUGUST 2015

8.2 Functional Block Diagram

A.

The adjustable output voltage version does not use the internal feedback resistor divider. The FB pin is directly

connected to the error amplifier.

B.

Do not connect the FC pin to an external power source

8.3 Feature Description

8.3.1 Low Noise Antiringing Switch

An antiringing switch is implemented in order to reduce the EMI radiated from the converter during discontinuous

conduction mode (DCM). In DCM, the inductor current ramps to zero before the end of each switching period.

The internal load comparator turns off the low side switch at that instant thus preventing the current flowing

backward through the inductance which increases the efficiency. An antiringing switch across the inductor

prevents parasitic oscillation caused by the residual energy stored in the inductance (see Figure 11).

NOTE

The antiringing switch is only activated in the fixed output voltage versions. It is not

enabled for the adjustable output voltage version TPS62000.

8.3.2 Enable

Logic low on EN forces the TPS6200x into shutdown. In shutdown, the power switch, drivers, voltage reference,

oscillator, and all other functions are turned off. The supply current is reduced to less than 1

μA in the shutdown

mode.

Copyright © 2000–2015, Texas Instruments Incorporated

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Product Folder Links: TPS62000 TPS62001 TPS62002 TPS62003 TPS62004 TPS62005 TPS62006 TPS62007

TPS62008