Intel BB5520UR Product Specification - Page 147
Capacitive Loading, Ripple/Noise, Timing Requirements
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Intel® Server Boards S5520HC, S5500HCV, and S5520HCT TPS Design and Environmental Specifications Table 76. Transient Load Requirements Output Δ Step Load Size 1 Load Slew Rate Test Capacitive Load +3.3 V 7.0 A 0.25A/μsec 4700μF +5 V 7.0 A 0.25A/μsec 1000μF +12 V 25 A 0.25A/μsec 4700μF +5 VSB 0.5 A 0.25A/μsec 20μF 1. Step loads on each 12 V output may happen simultaneously. 9.4.6 Capacitive Loading The power supply should be stable and meet all requirements within the following capacitive loading range. Table 77. Capacitive Loading Conditions Output +3.3V +5V +12V1, +12V2, +12V3, +12V4 -12V +5VSB Minimum 250 400 500 each 1 20 Maximum 6800 4700 11,000 350 350 Units μF μF μF μF μF 9.4.7 Ripple/Noise The maximum allowed ripple/noise output of the power supply is defined in the following table. This is measured over a bandwidth of 0 Hz to 20 MHz at the power supply output connectors. A 10 μF tantalum capacitor in parallel with a 0.1 μF ceramic capacitor are placed at the point of measurement. Table 78. Ripple and Noise +3.3V +5V +12V1, +12V2, +12V3, +12V4 -12V +5 VSB 50 mVp-p 50 mVp-p 120 mVp-p 120 mVp-p 50 mVp-p 9.4.8 Timing Requirements The following are the timing requirements for the power supply operation. The output voltages must rise from 10% to within regulation limits (Tvout_rise) within 5 ms to 70 ms. 5 VSB is allowed to rise from 1.0 ms to 25 ms. +3.3 V, +5 V, and +12 V output voltages should start to rise approximately at the same time. All outputs must rise monotonically. Each output voltage should reach regulation within 50 ms (Tvout_on) of each other during turn on of the power supply. Each output voltage should fall out of regulation within 400 msec (Tvout_off) of each other during turn off. The following tables and diagrams show the timing requirements for the power supply being turned on and off via the AC input with PSON held low, and the PSON signal with the AC input applied. Revision 1.8 133 Intel order number E39529-013