Internal

Regulator

On/Off

_

+

_

+

1.23-V

Band-Gap

Reference

52-kHz

Oscillator

Reset

Thermal

Shutdown

Current

Limit

FEEDBACK

4

+

1

Unregulated

DC Input

GND

3

OUTPUT

2

ON/OFF

5

+

D1

L

O

A

D

1-A

Switch

Driver

Fixed-Gain

Error Amplifier

Comparator

R2

R1

1 k

3.3 V: R2 = 1.7 k

5 V: R2 = 3.1 k

12 V: R2 = 8.84 k

15 V: R2 = 11.3 k

ADJ: R1 = Open, R2 = 0

Ω

L1

TL2575, TL2575HV

www.ti.com

SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014

9 Detailed Description

9.1 Overview

The TL2575 and TL2575HV devices greatly simplify the design of switching power supplies by conveniently

providing all the active functions needed for a step-down (buck) switching regulator in an integrated circuit.

Accepting a wide input-voltage range of up to 60 V (TL2575-HV) and available in fixed output voltages of 3.3 V, 5

V, 12 V, 15 V, or an adjustable-output version, the TL2575 and TL2575HV devices have an integrated switch

capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal

frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In

addition, a manual shutdown is available via an external ON/OFF pin.

The TL2575 and TL2575HV devices represent superior alternatives to popular three-terminal linear regulators.

Due to their high efficiency, the devices significantly reduce the size of the heatsink and, in many cases, no

heatsink is required. Optimized for use with standard series of inductors available from several different

manufacturers, the TL2575 and TL2575HV greatly simplify the design of switch-mode power supplies by

requiring a minimal addition of only four to six external components for operation.

The TL2575 and TL2575HV devices are characterized for operation over the virtual junction temperature range

of –40°C to 125°C.

9.2 Functional Block Diagram

Pin numbers are for the KTT (TO-263) package.

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Product Folder Links: TL2575 TL2575HV