Page 2 - SSI
SSI EPS1U Power Supply Design Guide, V1.1 Disclaimer: THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR ...
Page 3 - Contents; PSON
SSI EPS1U Power Supply Design Guide, V1.1 Contents 1 Purpose .......................................................................................................................................................... 5 2 Conceptual Overview ...............................................................
Page 4 - Figures
SSI EPS1U Power Supply Design Guide, V1.1 9 MTBF............................................................................................................................................................. 30 10 Agency Requirements .......................................................................
Page 5 - Purpose; These rails are typically as follows:; NOTE
SSI EPS1U Power Supply Design Guide, V1.1 1 Purpose This specification defines a non-redundant power supply that supports 1U rack mount entry server systems. The entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are defined in this specific...
Page 7 - Mechanical Overview; High Power Card Edge Form Factor; STATUS
SSI EPS1U Power Supply Design Guide, V1.1 4 Mechanical Overview There are two physical sizes of the power supply enclosure intended to accommodate power levels of 125W , 250W and 350W . There are two output connector designs. A card edge solution to provide ease of installation and removal and a wir...
Page 8 - Alternate Enclosure; Small Power Form Factor; ) for possible output connector; Interior Face
SSI EPS1U Power Supply Design Guide, V1.1 4.2 Alternate Enclosure STATUS Small Power Form Factor Systems may require a smaller power supply enclosure. Figure 2 details a smaller power supply enclosure for such systems. This form factor accommodates power levels of 250W and 125W . The supply will pro...
Page 9 - Airflow Requirements; Temperature Requirements; temperature range. The average air
SSI EPS1U Power Supply Design Guide, V1.1 4.3 Airflow Requirements STATUS Recommended The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During low-speed fan operation, the power supply shall not exceed a noise level of 38 dBA measured at one meter ...
Page 10 - AC Input Requirements; AC Inlet Connector; Required; AC Input Voltage Specification; Required; Table 3: AC Input Rating; Input Under Voltage; Required
SSI EPS1U Power Supply Design Guide, V1.1 5 AC Input Requirements STATUS Required The power supply shall incorporate universal power input with active power factor correction, which shall reduce line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards. 5.1 AC Inlet Connector STATUS...
Page 11 - AC Line Dropout; Optional
SSI EPS1U Power Supply Design Guide, V1.1 5.4 Efficiency STATUS Required The power supply shall have a minimum efficiency of 68% at maximum load and over the specified AC voltage. There is no efficiency requirement for the 125W version. 5.5 AC Line Dropout STATUS Required An AC line dropout is defin...
Page 12 - AC Line Transient Specification; AC Line Fast Transient Specification
SSI EPS1U Power Supply Design Guide, V1.1 STATUS Recommended An additional inrush current limit is recommended for some system applications that require multiple systems on a single AC circuit. AC line inrush current shall not exceed 30 A peak for one-quarter of the AC cycle, after which, the input ...
Page 13 - DC Output Specification; signal
SSI EPS1U Power Supply Design Guide, V1.1 6 DC Output Specification 6.1 Connector STATUS Required The power supply uses a blind mating type connector with edge fingers (see Figure 1) to connect the power supply’s output voltages and signals to a connector located in the system. The card edge pin ass...
Page 14 - Figure 3: Edge Finger Layout
SSI EPS1U Power Supply Design Guide, V1.1 Figure 3: Edge Finger Layout 1.6 0.38 x 45 2x 5VSB PSON# ACWarning PWOK Bottom view of power supply Reserved 31 1 62 32 Keying Notch 3.3V 5V 12V2 -12V SDA SCL PSAlert# 3.3VS Retu rnS Top View of Power Supply Reserved Removed pin (NC) Reserved Reserved 12V2 G...
Page 17 - Standby Outputs
SSI EPS1U Power Supply Design Guide, V1.1 STATUS High Power Recommendation Table 9: 350 W Load Ratings Load Range 1 Voltage Minimum Continuous Maximum Continuous Peak +3.3 V 1.5 A 16 A +5 V 1.0 A 12 A +12 V1 1.5 A 16 A See note 2 +12 V2 1.5 A 16 A See note 2 -12 V 0 A 0.5 A +5 VSB 0.1 A 2.0 A Load R...
Page 18 - Voltage Regulation; Dynamic Loading
SSI EPS1U Power Supply Design Guide, V1.1 6.5 Voltage Regulation STATUS Required The power supply output voltages must stay within the following voltage limits when operating at steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise specified in Section 6.8. All...
Page 19 - Capacitive Loading
SSI EPS1U Power Supply Design Guide, V1.1 6.7 Capacitive Loading STATUS Required The power supply shall be stable and meet all requirements with the following capacitive loading ranges. Table 13: Capacitive Loading Conditions Output MIN MAX Units +3.3 V 10 6,800 µ F +5 V 10 4,700 µ F +12 V 10 11,000...
Page 20 - Timing Requirements; Figure 4: Output Voltage Timing
SSI EPS1U Power Supply Design Guide, V1.1 6.9 Timing Requirements STATUS Required These are the timing requirements for the power supply operation. The output voltages must rise from 10% to within regulation limits (T vout_rise ) within 5 to 70 ms. The +3.3 V, +5 V and +12 V output voltages should s...
Page 23 - Protection Circuits; Table 17: Over Current Protection; Table 18: Over Current Protection; Voltage
SSI EPS1U Power Supply Design Guide, V1.1 7 Protection Circuits STATUS Required Protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 seconds and a PSON # ...
Page 24 - Over Voltage Protection; signal or by an AC; Output Voltage; Over Temperature Protection; Recommended; C of ambient temperature hysteresis.
SSI EPS1U Power Supply Design Guide, V1.1 7.3 Over Voltage Protection STATUS Required The power supply over voltage protection shall be locally sensed. The power supply shall shutdown and latch off after an over voltage condition occurs. This latch shall be cleared by toggling the PSON # signal or b...
Page 25 - Control and Indicator Functions; The PSON; Signal Type; MIN
SSI EPS1U Power Supply Design Guide, V1.1 8 Control and Indicator Functions The following sections define the input and output signals from the power supply. Signals that can be defined as low true use the following convention: signal # = low true 8.1 PSON # STATUS Required The PSON # signal is requ...
Page 26 - Table 21: PWOK Signal Characteristics; PWOK rise and fall time
SSI EPS1U Power Supply Design Guide, V1.1 8.2 PWOK (Power OK) STATUS Required PWOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all the outputs are within the regulation limits of the power supply. When any output voltage falls below regulation limits or when AC ...
Page 28 - FRU Data; Table 23: FRU Device Information; Area Type; Table 24: FRU Device Product Information Area; Field Name
SSI EPS1U Power Supply Design Guide, V1.1 8.4 Field Replacement Unit (FRU) Signals STATUS Optional Two pins will be allocated for the FRU information on the power supply connector. One pin is the Serial Clock (SCL). The second pin is used for Serial Data (SDA). Both pins are bi-directional and are u...
Page 29 - Power Supply Information (Record Type 0x00); Field Information Definition
SSI EPS1U Power Supply Design Guide, V1.1 8.4.2.2 MultiRecord Area As defined by the IPMI FRU document. The following record types shall be used on this power supply: • Power Supply Information (Record Type 0x00) • DC Output (Record Type 0x01) • No other record types are required for the power suppl...
Page 30 - Table 26: LED Indicators; Power Supply Condition; MTBF
SSI EPS1U Power Supply Design Guide, V1.1 8.5 LED Indicator STATUS Required There will be a single GREEN LED to indicate power supply status. When AC is applied to the PSU and standby voltages are available the LED shall BLINK GREEN. The LED shall turn ON GREEN to indicate that all the power outputs...
Page 31 - Agency Requirements
SSI EPS1U Power Supply Design Guide, V1.1 10 Agency Requirements STATUS Recommended The power supply must comply with all regulatory requirements for its intended geographical market. Depending on the chosen market, regulatory requirements may vary. Although a power supply can be designed for worldw...
