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Intel ATX12V DC Output Noise/Ripple, Differential Noise Test Setup, Scope, Power Supply, Load

Models: ATX12V

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ATX12V Power Supply Design Guide

Version 2.0

Table 10. DC Output Noise/Ripple

Output

+12 V1DC

+12 V2DC

+5 VDC

+3.3 VDC

-12 VDC

+5 VSB

Max. Ripple & Noise

(mVpp)

120

200

120

Power Supply	V out
AC Hot
AC Neutral	V return	10uf	0.1uf
	V return

AC Ground

General Notes:

1.Load the output with its minimum load current.

2.Connect the probes as shown.

3.Repeat the measurement with maximum load on the output.

Load

Load must be isolated from the ground of the power supply.

Filter Note:

0.1uf - Kemet, C1206C104K5RAC or equivalent 10uf - United Chemi-con, 293D106X0025D2T or

equivalent

Scope

Scope Note:

Use Tektronix TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent.

Figure 5. Differential Noise Test Setup

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Intel ATX12V manual DC Output Noise/Ripple, Differential Noise Test Setup, Scope, Power Supply, Load

Contents

ATX12V Power Supply Design Guide VersionIMPORTANT INFORMATION AND DISCLAIMERS Contents IntroductionApplicable Documents ElectricalSafety 4. Mechanical5. Environmental 6. Electromagnetic CompatibilityTables ATX12V Power Supply Design Guide VersionFigures 1. Introduction 1.1. Scope1.2.1. Increased +12 VDC output capability 1.2.2. Minimum Efficiency1.3 Terminology 1.2.3. Main Power Connector1.2.4. Separate current limit for 12V2 on the 2x2 connector Description 2. Applicable DocumentsDocument Title 3. Electrical 3.1. AC Input3.1.1. Input Over-current Protection 3.1.2. Inrush Current Limiting3.1.3. Input Under-voltage 3.1.4. RegulatoryPRODUCT SAFETY ELECTROMAGNETIC CAMPATIBILITY3.2.1. DC Voltage Regulation 3.2. DC Output3.1.5. Catastrophic Failure Protection 3.2.3. Typical Power Distribution 3.2.2. Remote SensingFigure 1. Cross Loading Graph for 250W Configuration 3.2.3.1. ATX12V ConfigurationsTable 3. Typical Power Distribution for a 250 W ATX12V Configuration Table 4. Typical Power Distribution for a 300 W ATX12V Configuration Figure 2. Cross Loading Graph for 300W ConfigurationTable 5. Typical Power Distribution for a 350 W ATX12V Configuration Figure 3. Cross Loading Graph for 350W ConfigurationTable 6. Typical Power Distribution for a 400 W ATX12V Configuration Figure 4. Cross Loading Graph for 400W Configuration3.2.4. Power Limit / Hazardous Energy Levels 3.2.5. Efficiency3.2.5.1. General Table 7. Minimum Efficiency Vs LoadATX12V Power Supply Design Guide Table 8. Loading Table for Efficiency Measurements3.2.6. Output Ripple/Noise Table 9. Energy Star Input Power Consumption3.2.5.3. Other Low Power System Requirements 3.2.5.2. Energy StarFigure 5. Differential Noise Test Setup Power SupplyTable 10. DC Output Noise/Ripple Scope3.2.7. Output Transient Response 3.2.8. Capacitive LoadTable 11. DC Output Transient Step Sizes Table 12. Output Capacitive Loads3.2.10. +5 VDC / +3.3 VDC Power Sequencing 3.3. Timing / Housekeeping / Control3.2.9. Closed-loop Stability 3.2.11. Voltage Hold-up TimeTable 13. PWROK Signal Characteristics 3.3.1. PWROK3.3.2. PSON# Figure 7. PSON# Signal Characteristics 3.3.3. +5 VSBTable 14. PSON# Signal Characteristics 3.3.4. Power-on Time 3.3.7. Reset after Shutdown3.3.8. +5 VSB at AC Power-down 3.3.5. Risetime3.4. Output Protection 3.4.1. Over-voltage Protection3.4.2. Short-circuit Protection 3.4.3. No-load Operation3.4.5. Over-temperature Protection 3.4.6. Output Bypass4.1. Labeling / Marking 4.2. Physical Dimensions4. Mechanical Second optional fan may go in this location Air inlet grill, 55% open areaSecond optional fan may be locatedin optional venting area or on topside4.3. Airflow / Fan 4.4. AC Connector 4.5. DC ConnectorsMain Power Connector PSON#4.5.1. ATX Main Power Connector ATX12V Power Supply Design Guide Version 4.5.2. +12 V Power Connector4.5.3. Peripheral Connectors 4.5.4. Serial ATA Power Connector 4.5.5. Floppy Drive ConnectorThis is a required connector for systems with Serial ATA devices Figure 11. Serial ATA ConnectorEnvironmental TemperatureThermal Shock Shipping Humidity5.5. Mechanical Shock 5.6. Random Vibration5.7. Acoustics ATX12V Power Supply Design Guide Version 2.0 Final Review Copy6.2. Immunity 6. Electromagnetic Compatibility6.1. Emissions Table 16. Harmonic Limits, Class D Equipment 6.3. Input Line Current Harmonic Content and Line Flicker6.4. Magnetic Leakage Fields 7. Reliability 7.1. Component De-rating8. Safety 8.1. North America8.2. International 8.3. Proscribed Materials