ATX ATX2005 Schematics

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ATX 2005

POWER SUPPLY PWM SUPERVISOR

(Messias-BH.)

Power Supply Pulse Width Modulation Integrated Circuit Controller

Specs

(English version)

version 1.0

April, 2012

http://www.4shared.com/office/_E8A5czR/ATX_2005.html

ATX 2005

Specification: v-1.0

Page 02

General Description

The integrated circuit ATX-2005 is a pulse width modulation (PWM) controller, which can be used in the

power supplies' secondary side, ready to provide the total voltage and load switching control.

ATX-2005 has all inside functions for protection and control, undervoltage/overvoltage detection, output

voltage status monitor (PG), external remote control (REM)... and more.

The ATX-2005 is able to set the power supply's behavior in order to reduce the external devices usage to

get required control. The undervoltage (UVP) and overvoltage (OVP) modules assist the 3.3V, 5V, and

12V voltage levels. The PP function is set to monitor power and negative voltages, and a built-in shunt

regulator module (the 431 shunt regulator) is built to make the PWM's correct level control, providing a

stable output voltage through a group of amplifiers that monitor the feedback pattern. Besides, the anti-

noise filter prevents malfunction caused by outer interference.

Features

• 3.3V / 5V e 12V Overvoltage Protection

• 3.3V / 5V / 12V Undervoltage Protection

• 3.3V / 5V / 12V Undervoltage Detection

• PP: Overcharge and Negative voltage protection

• Pulse Width Modulation (PWM) control device

• "Soft-Start" improvement, using external capacitor to perform easy quick start

• RI – External resistor to settle down the internal reference current, noise immunity and delay time

protection

• PG-Shifter: monitor the normal voltage condition test

• Undervoltage Protection (UVP): noise reduction function added

• Overvoltage Protection (OVP): noise reduction function added

• Undervoltage Protection (UVP): 250ms delay time function

• Remote switching control (REM): noise reduction function added

• Built-in shunt regulator to provide stable output voltage (431 Shunt Regulator)

• Package type: 16-Pins Dual In-line Package (DIP-16)

Pin Assignment

Pinning

ATX 2005

Specification: v-1.0

Page 03

Pin Symbol

1 VCC Source Positive power source input

2 REM Input

3 V3.3 Input

4 V5 Input

5 PP Input

6 V12 Input

7 O1 Output

8 O2 Output

9 PG Output

10 FB Output

11 VREF Input Shunt (shunt regulator) input

12 GND Ground Negative power source input

13 COMP Output

14 NEG Input

Function Description

Remote switch on/off signal (low: On / high: Off)

3,3V voltage monitor

5V voltage monitor

Power/ Negative voltage protection input

12V voltage monitor

Open collector output driver #1

Open collector output driver #2

"Power Good" status sensor input

Shunt (shunt regulator) output

Compensation OpAmp output

– Duty Cycle Control

Compensation OpAmp negative input

– Negative Feedback Sensor

15 SS Input

16 RI Input

Limiting Values

Item Symbol Conditions

Supply

voltage

Power

dissaption

Operating

temperature

Storage

temperature

Compensation OpAmp positive input

– Soft-start Capacitor pin

External connection of a resistor to set the internal
reference current value, this feature can also adjust
the internal noise immunity and protection delay time

Min. Typ. Max. Unit

VCC 4,5 5 5,5 V

Pd -- 1000 -- mW

-10 -- +70 °C

-65 -- +150 °C