eorex

(Preliminary)

EP3101

Jul. 2006

www.eorex.com

1/13

150 KHz, 3A Asynchronous Step-down Converter

Features

• Output Voltage: 3.3V, 5V, 12V and Adjustable

Output Version

• Adjustable Version Output Voltage Range,

1.23V to 37V ±4%

• 150KHz±15% Fixed Switching Frequency

• Voltage Mode Asynchronous PWM Control

• Thermal-shutdown and Current-limit Protection

• ON/OFF Shutdown Control Input

• Operating Voltage can be up to

40V

• Output Load Current: 3A

• Low Power Standby Mode

• Built-in on Chip Switching Transistor

• TO263-5L and TO220-5L Packages

Applications

• Simple High-efficiency Step-down Regulator

• On-card Switching Regulators

• Positive to Negative Converter

Description

The EP310

1 series are monolithic integrated

circuits that provide all the active functions for a

step-down DC/DC converter, capable of driving a

3A load without additional transistor component.

Requiring a minimum number of external

components, the board space can be saved

easily. The external shutdown function can be

controlled by TTL logic level and then come into

standby mode. The internal compensation makes

feedback control have good line and load

regulation without external design. Regarding

protected function, thermal shutdown is to

prevent over temperature operating from damage,

and current limit is against over current operating

of the output switch.

The EP3101 series operates at a switching

frequency of 150KHz thus allowing smaller sized

filter frequency switching regulators. Other

features include a guaranteed ±4％ tolerance on

output voltage under specified input voltage and

output load conditions, and ±15 ％

on the

oscillator frequency. The output version includes

fixes 3.3V, 5V, 12V, and an adjustable type. The

packages are available in a standard 5-lead

TO-220(T) package and a 5-lead TO-263(U)..

Typical Application