User manual ENHANCE LFX12V V1.0

[. . . ] LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector LFX12V Lowprofile Form Factor with 12-Volt Connector Power Supply Design Guide Version 1. 0 Revision History Version Release Date 1. 0 April, 2004 Notes · First public release. 1 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector IMPORTANT INFORMATION AND DISCLAIMERS INTEL CORPORATION (AND ANY CONTRIBUTOR) IS PROVIDING THIS INFORMATION AS A CONVENIENCE AND ACCORDINGLY MAKES NO WARRANTIES WITH REGARD TO THIS DOCUMENT OR PRODUCTS MADE IN CONFORMANCE WITH THIS DOCUMENT. THIS DOCUMENT IS PROVIDED "AS IS" AND INTEL DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE. IN ADDITION, INTEL (AND ANY CONTRIBUTOR) DOES NOT WARRANT OR REPRESENT THAT THIS DOCUMENT OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL OPERATE IN THE INTENDED MANNER, ARE FREE FROM ERRORS OR DEFECTS, OR ARE SAFE FOR USE FOR ITS INTENDED PURPOSE. ANY PERSON USING THIS DOCUMENT OR MAKING, USING, OR SELLING PRODUCTS IN CONFORMANCE WITH THIS DOCUMENT DOES SO AT HIS OR HER OWN RISK. INTEL DISCLAIMS ALL LIABILITY ARISING FROM OR RELATED TO USE OR IMPLEMENTATION OF THE INFORMATION PROVIDED IN THIS DOCUMENT, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS RELATING TO THE INFORMATION OR THE IMPLEMENTATION OF INFORMATION IN THIS DOCUMENT. INTEL DOES NOT WARRANT OR REPRESENT THAT SUCH DEVICES OR IMPLEMENTATION WILL NOT INFRINGE SUCH RIGHTS. INTEL IS NOT OBLIGATED TO PROVIDE ANY SUPPORT, INSTALLATION OR OTHER ASSISTANCE WITH REGARD TO THE INFORMATION OR PRODUCTS MADE IN ACCORDANCE WITH IT. [. . . ] 12V) 70 5V + 3. 3V power (watts) 60 50 40 30 20 10 0 0 50 100 150 200 12V power (watts) Combined Power (5V rail + 3. 3V rail) 12 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector 2. 2. 4 Power Limit / Hazardous Energy Levels Under normal or overload conditions, it is required that no output shall continuously provide more than 240 VA under any conditions of load including output short circuit, per the requirement of UL 1950/CSA 950 / EN 60950/IEC 950 specification. 2. 2. 5 Efficiency General The power supply should have a required minimum efficiency as stated in Table 5 and when cost effective provide the recommended efficiency in Table 5. The efficiency of the power supply should be tested at nominal input voltage of 115VAC input and 230VAC input, under the load conditions defined in Table 5, and under the temperature and operating conditions defined in Section 3. The loading condition for testing efficiency shown in Table 5 represents a fully loaded system, a 50% loaded system (typical load), and a 20% loaded (light load) system. Efficiency Vs Load Loading Required: Minimum Efficiency Recommended: Minimum Efficiency Full load 70% 75% Typical load 70% 80% Light load 60% 67% Table 6. Loading Tables for Efficiency Measurements 180W (loading shown in Amps) Loading Full Typical Light +12V 11. 0 6. 0 2. 8 +5V 7. 0 3. 0 0. 3 +3. 3V 4. 0 3. 0 0. 5 -12V 0. 2 0. 1 0 +5Vsb 0. 5 0. 5 0. 1 200W (loading shown in Amps) Loading Full Typical Light +12V 11. 5 7. 0 3. 0 +5V 8. 0 3. 0 0. 4 +3. 3V 6. 0 4. 0 0. 5 -12V 0. 2 0. 1 0 +5Vsb 1. 0 1. 0 0. 5 13 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector 2. 2. 5. 1 Energy Star* The "Energy Star" efficiency requirements of the power supply depend on the intended system configuration. In the low power / sleep state (S1 or S3) the system should consume power in accordance with the values listed in Table 7. Energy Star Input Power Consumption Maximum Continuous Power Rating of Power Supply < 200 W > 200 W < 300 W > 300 W < 350 W > 350 W < 400 W > 400 W RMS Watts from the AC Line in Sleep/low-Power Mode < 15 W < 20 W < 25 W < 30 W 10% of the maximum continuous output rating Note: To help meet the "Energy Star" system requirements, it is recommended that the power supply have 50% efficiency at light load and in standby mode. 2. 2. 5. 2 Other Low Power System Requirements To help meet the Blue Angel* system requirements, RAL-UZ 78, US Presidential executive order 13221, future EPA requirements, and other low Power system demands, it recommended that the +5 VSB standby supply efficiency should be as high as possible. Standby efficiency is measured with the main outputs off (PS_ON# high state). Standby efficiency should be greater than 50% with a load of 100mA. 2. 2. 6 Output Ripple/Noise The output ripple/noise requirements listed in 14 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector Table 8 should be met throughout the load ranges specified in Section 2. 2. 3 and under all input voltage conditions as specified in 2. 1, Table 1. Ripple and noise are defined as periodic or random signals over a frequency band of 10 Hz to 20 MHz. Measurements shall be made with an oscilloscope with 20 MHz of bandwidth. Outputs should be bypassed at the connector with a 0. 1µF ceramic disk capacitor and a 10µF electrolytic capacitor to simulate system loading. See Figure 3. 15 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector Table 8. DC Output Noise/Ripple Output +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB V out Lo ad Maximum Ripple and Noise (mVpp) 120 50 50 120 50 Pow er Supply AC H ot AC N eutral V return 10uf 0. 1uf Load m ust be isolated from the ground of the power supply. AC G round G eneral N otes: 1. Load the output with its m inim um load current. R epeat the m easurem ent with m axim um load on the output. Scope Filter N ote: 0. 1uf ­ Kem et*, C 1206C 104K5R AC or equivalent 10uf - U nited C hem i-con*, 293D 106X0025D 2T or equivalent S cope N ote: U se Tektronix* TD S 460 O scilloscope or equivalent and a P 6046 probe or equivalent. Figure 3. Differential Noise Test Setup 2. 2. 7 Output Transient Response 16 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector Table 9 summarizes the expected output transient step sizes for each output. The transient load slew rate is = 1. 0 A/µs. 17 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector Table 9. DC Output Transient Step Sizes Output +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB Maximum Step Size (% of rated output amps) 50% 30% 30% 0. 1 A 0. 5 A Maximum Step Size (amps) Note: For example, for a rated +5 VDC output of 14 A, the transient step would be 30% × 14 A = 4. 2 A Output voltages should remain within the regulation limits of Table 2, Section 2. 2. 1, for instantaneous changes in load as specified in 18 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector Table 9 and for the following conditions: · · · Simultaneous load steps on the +12 VDC, +5 VDC, and +3. 3 VDC outputs (all steps occurring in the same direction) Load-changing repetition rate of 50 Hz to 10 kHz AC input range per Section 2. 1 and capacitive loading per Table 10 2. 2. 8 Capacitive Load The power supply should be able to power up and operate with the regulation limits defined in Table 2, Section 2. 2. 1, with the following capacitances simultaneously present on the DC outputs. Output Capacitive Loads Output +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB Capacitive Load (µF) 3, 000 5, 000 3, 000 350 350 2. 2. 9 Closed-loop Stability The power supply is required to be unconditionally stable under all line/load/transient load conditions including capacitive loads specified in Section 2. 2. 8. A minimum of 45 degrees phase margin and 10 dB gain margin is recommended at both the maximum and minimum loads. 2. 2. 10 +5 VDC / +3. 3 VDC Power Sequencing The +12 VDC and +5 VDC output levels must be equal to or greater than the +3. 3 VDC output at all times during power-up and normal operation. The time between the +12 VDC or +5 VDC output reaching its minimum in-regulation level and +3. 3 VDC reaching its minimum in-regulation level must be 20 ms. 2. 2. 11 Voltage Hold-up Time The power supply should maintain output regulations per Section 2. 2. 1 despite a loss of input power at the low-end nominal range--115 VAC / 57 Hz or 230 VAC / 47 Hz - at maximum continuous output load as applicable for a minimum of 17 ms. 19 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector 2. 3 Timing / Housekeeping / Control T1 VAC T5 ~ ~ ~ T2 T3 PS_ON# +12VDC +5VDC +3. 3VDC } 95% O/P's 10% PWR_OK T4 ~ T6 PWR_OK Sense Level = 95% of nominal timing_3_5_12b Figure 4. [. . . ] Quaternary salt and PCB electrolytic capacitors shall not be used. CFC's or HFC's shall not be used in the design or manufacturing process. Mercury shall not be used. 38 LFX12V Power Supply Design Guide Lowprofile Form Factor with 12-Volt Connector 6 Safety The following subsections outline sample product regulations requirements for a typical power supply. Actual requirements will depend on the design, product end use, target geography, and other variables. [. . . ]