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OKDY-T Datasheet(PDF) 25 Page - Murata Power Solutions Inc. |
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OKDY-T Datasheet(HTML) 25 Page - Murata Power Solutions Inc. |
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25 / 41 page  The master device in a tracking group is defined as the device that has the highest target output voltage within the group. This master device will control the ramp rate of all tracking devices and is not configured for tracking mode. All of the CTRL pins in the track- ing group must be connected and driven by a single logic source. It should be noted that current sharing groups that are also configured to track another voltage do not offer pre-bias protection; a minimum load should therefore be enforced to avoid the output voltage from being held up by an outside force. Voltage Margining Up/Down The product can adjust its output higher or lower than its nominal voltage setting in order to determine whether the load device is capa- ble of operating over its specified supply voltage range. This provides a convenient method for dynamically testing the operation of the load circuit over its supply margin or range. It can also be used to verify the function of supply voltage supervisors. Margin limits of the nominal output voltage ±5% are default, but the margin limits can be reconfig- ured using the PMBus interface. Pre-Bias Startup Capability Pre-bias startup often occurs in complex digital systems when current from another power source is fed back through a dual-supply logic component, such as FPGAs or ASICs. The product family incorporates synchronous rectifiers, but will not sink current during startup, or turn off, or whenever a fault shuts down the product in a pre-bias condi- tion. Pre-bias protection is not offered for current sharing groups that also have voltage tracking enabled. Group Communication Bus The Group Communication Bus, GCB, is used to communicate between products. This dedicated bus provides the communica- tion channel between devices for features such as sequencing, fault spreading, and current sharing. The GCB solves the PMBus data rate limitation. The GCB pin on all devices in an application should be con- nected together. A pull-up resistor is required on the common GCB in order to guarantee the rise time as follows: Output Voltage Sequencing A group of products may be configured to power up in a predeter- mined sequence. This feature is especially useful when powering advanced processors, FPGAs, and ASICs that require one supply to reach its operating voltage prior to another. Multi-product sequenc- ing can be achieved by configuring the start delay and rise time of each device through the PMBus interface and by using the CTRL start signal. Voltage Tracking The product integrates a lossless tracking scheme that allows its output to track a voltage that is applied to the VTRK pin with no external components required. During ramp-up, the output voltage follows the VTRK voltage until the preset output voltage level is met. The product offers two modes of tracking as follows: 1. Coincident. This mode configures the product to ramp its output voltage at the same rate as the voltage applied to the VTRK pin. 2. Ratiometric. This mode configures the product to ramp its output voltage at a rate that is a percentage of the voltage applied to the VTRK pin. The default setting is 50%, but a different tracking ratio may be set by an external resistive voltage divider or through the PMBus interface. Illustration of Output Voltage Sequencing. t V1 V2 VOUT Illustration of Coincident Voltage Tracking. t MASTER SLAVE VOUT Illustration of Ratiometric Voltage Tracking t MASTER SLAVE VOUT OKDx-T/50-W12-C 50A Digital PoL DC-DC Converter Series MDC_OKDx-T/50-W12-C.A04 Page 25 of 41 www.murata-ps.com/support |
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