TS2576 datasheet, PDF - EEWORLD Datasheet

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TS2576: Description3A / 52KHz Buck Switching Regulator; File Size313KB，8 Pages; ManufacturerTaiwan Semiconductor; Websitehttp://www.taiwansemi.com/

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TS2576 Overview

3A / 52KHz Buck Switching Regulator

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TS2576

3A / 52KHz Buck Switching Regulator

TO-220-5L

TO-263-5L

(D PAK)

Pin Definition:

1. Input

2. SW Output

3. Ground

4. Feedback

5. Enable

General Description

TS2576 Series are step-down switching regulators with all required active functions. It is capable of driving 3A load

with excellent line and load regulations. These devices are available in fixed output voltages of 3.3V, 5V and

adjustable output version.

TS2576 series operates at a switching frequency of 52kHz thus allowing smaller sized filter components than what

would be needed with lower frequency switching regulators. It substantially not only reduces the area of board size

but also the size of heat sink, and in some cases no heat sink is required. The ±4% tolerance on output voltage within

specified input voltages and output load conditions is guaranteed. Also, the oscillator frequency accuracy is within

±10%. External shutdown is included. Featuring 70µA (typical) standby current. The output switch includes cycle-by-

cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Features

●

Output Voltage: 3.3V, 5V & Adjustable version

Adjustable Output Voltage Range 1.23V~37V ±4%

52kHz fixed switching frequency

Voltage Mode Non-synchronous PWM control

Thermal Shutdown and Current Limit Protection

ON/OFF Shutdown Control Input

High Efficiency

Short Circuit Protect (SCP)

Operating Voltage Can be up to 40V

Output Load Current 3A

Low Power Standby Mode

P+ Product Enhancement Tested

Ordering Information

Part No.

Package

Packing

TS2576CZ5xx C0

TO-220-5L

50pcs / Tube

TS2576CM5xx RN

TO-263-5L

800pcs / 13” Reel

Note: Where

denotes voltage option, available are

50=

5.0V

33=

3.3V

Leave blank for adjustable version

Application

●

Simple High-efficiency Step down Regulator

On-Card Switching Regulators

Positive to Negative Converter

Absolute Maximum Rating

Parameter

Maximum Supply Voltage

Recommend Operating Supply Voltage

SW, EN Pin Input Voltage

Feedback Pin Voltage

Power Dissipation

Output Voltage to Ground

Storage Temperature Range

Operating Temperature Range

ESD Susceptibility (HBM)

Symbol

, V

OUT

Limit

+45

4.5 to 40

-0.3 to +25

Internally Limited

-1

-65 to +150

-40 to +125

Unit

1/8

Version: A07

TS2576

3A / 52KHz Buck Switching Regulator

Pin Function Description

Vcc

This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at

this pin to minimize voltage transients and to supply the switching currents needed by the regulator.

Ground

Circuit ground

SW Output

Internal switch. The voltage at this pin switches between (+Vcc – Vsat) and approximately – 0.5V, with a duty cycle of

approximately Vout / Vcc. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin

should be minimized.

Feedback

Sense the regulated output voltage to complete the feedback loop.

Enable

Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply

current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on,

and pulling this pin above 1.3V (up to a maximum of Vcc) shuts the regulator down. If this shutdown feature is not

needed, the EN pin can be wired to the ground pin.

Thermal Considerations

The TS2576 is available in two packages, a TO-220-5L and TO-263-5L.

The TO-220-5L package needs a heat sink under most conditions. The size of the heat sink depends on the input

voltage, the output voltage, the load current and the ambient temperature. The TS2576 junction temperature rises

above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken

with the TS2576CZ5 (TO-220-5L package) operating as a buck switching regulator in an ambient temperature of 25 C

(still air). These temperature rise numbers are all approximate and there are many factors that can affect these

temperatures. Higher ambient temperatures require more heat sinking.

The TO-263-5L surface mount package tab is designed to be soldered to the copper on a printed circuit board. The

copper and the board are the heat sink for this package and the other heat producing components, such

as the catch

diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in , and ideally

should have 2 or more square inches of 2oz.

Additional copper area improves the thermal characteristics, but with

copper areas greater than approximately 6 in , only small improvements in heat dissipation are realized. If further

thermal improvements are needed, double sided, multilayer PC board with large copper areas and/or airflow are

recommended.

The TS2576 (TO-263-5L package) junction temperature rise above ambient temperature with a 3A load for various

input and output voltages. This data was taken with the circuit operating as a buck switching regulator with all

components mounted on a PC board to simulate the junction temperature under actual operating conditions. This

curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that

there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double

sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high ambient

temperatures and high output voltages.

For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be

used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of

copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and

moving air lowers the thermal resistance even further.

5/8

Version: A07

TS2576 Related Products

	TS2576	TS2576CM5	TS2576CZ5	TS2576_07
Description	3A / 52KHz Buck Switching Regulator	Switching Regulator/Controller, Voltage-mode, 3A, 58kHz Switching Freq-Max, BIPolar	Switching Regulator/Controller, Voltage-mode, 3A, 58kHz Switching Freq-Max, BIPolar	3A / 52KHz Buck Switching Regulator

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