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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
Page 2
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
Page 3
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
Page 4
Electrical Characteristics
TA temperature = 25 °C, main voltage VCC = 5V
Voltage protection levels (V33, V5, V12, PP)
Item Symbol Conditions Min. Typ. Max. Unit
V33 PG low 3.9 4.1 4.4 V
Overvoltage
• Protection
Undervoltage
• Protection
Undervoltage
• Detection
Undervoltage
• Delay Time
V5 PG low 5.6 6.0 6.4 V
V12 PG low 13.4 14.0 14.4 V
PP PG low 2.3 2.6 2.8 V
V33 PG low 2.0 2.4 -- V
V5 PG low 3.0 3.6 -- V
V12 PG low 5.9 7.1 -- V
V33 PG low 2.6 2.9 3.1 V
V5 PG low 4.1 4.45 4.7 V
V12 PG low 9.6 10.3 10.7 V
Td1 Remon On/Off 150 250 350 ms
Start Switch – On/Off (REM)
ATX 2005
Specification: v-1.0
Page 04
High Level
Input Voltage
Low Level
Input Voltage
REMOTE
REMOTE OFF
Item Symbol Conditions
VIH --- 1.8 V
VIL --- 0.8 V
t
--- 22 28 34 ms
Delay Time
Delay Time
db-rem
t
db-remoff
--- 4 ms
Min. Typ. Max. Unit
Pulse Width Modulation (PWM) Output 1, 2 (O1, O2)
Item Symbol Conditions Min. Typ. Max. Unit
Leakage
Current
Duty Cycle
(máx.)
I
LEAKAGE
DC
max
Output = 5v -- 5 -- uA
Duty cycle
(max.)
84 -- 93
Power Good Sensor (PG)
Item Symbol Conditions Min. Typ. Max. Unit
﹪
PG – Leakage
Current
PG – Delay
Delay Time
Output Voltage
Low level
I
PG=5V -- -- 2 uA
PGL
Td
VOL I
--
=10mA -- 0.2 0.4 V
PGO
100 220 400 ms
Page 5
Shunt Regulator (VREF FB)
Item Symbol Conditions Min. Typ. Max. Unit
ATX 2005
Specification: v-1.0
Page 05
Reference voltage
for Shunt Reg.
Output Sink
Current
V
IFB = 0.5mA 2.45 2.50 2.55 V
REF
I
VFB > 3V 10 -- -- mA
OUT
Op-amp OP (COMP NEG, e SS)
Item Symbol Conditions Min. Typ. Max. Unit
Close Loop
Voltage gain
Cross over
crossing point
-- 0.5V~3.5V
-- 0 dB
Soft-start (SS,RI)
Item Symbol Conditions Min. Typ. Max. Unit
Soft Start
charge current
ICH RI=75KΩ 8.0 9.5 11.0 µA
Reference:
Internal Control Circuit Diagram
--
--
65
310
--
--
dB
KHZ
Page 6
Package Outline
ATX 2005
Specification: v-1.0
Page 06
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