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CAR2548FP 데이터시트(PDF) 7 Page - Lineage Power Corporation |
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CAR2548FP 데이터시트(HTML) 7 Page - Lineage Power Corporation |
7 / 15 page GE Data Sheet CAR0812DC series dc-dc converter Input: -36Vdc to -75Vdc; Output: +12 Vdc @ 850W; 3.3Vdc or 5 Vdc @ 1A March 28, 2013 ©2013 General Electric Company. All rights reserved. Page 7 Control and Status Control hierarchy: Some features, such as output voltage, can be controlled both through hardware and firmware. For example, the output voltage is controlled both by the signal pin (Vprog) and the PMBus command, (Vout_command) . Using output voltage as an example; the Vprog signal pin has ultimate control of the output voltage until the Vprog is either > 3Vdc or a no connect. When the programming signal via Vprog is either a no connect or > 3Vdc, it is ignored, the output voltage is set at its nominal 12Vdc and the unit output voltage can be controlled via the PMBus command, (Vout_command). Analog controls: Details of analog controls are provided in this data sheet under Signal Definitions. Common ground: All signals and outputs are referenced to Output return. These include ‘Vstb return’ and ‘Signal return’. Control Signals Voltage programming (Vprog): An analog voltage on this signal can vary the output voltage ± 10% from 43.2Vdc to 52.8Vdc. The equation of this signal is: Vout = 43.2 + 3.3 (Vprog – 0.09) 0.09 < Vprog < 3 If Vprog is > 3V or left open the programming signal is ignored and the unit output is set at the setpoint of 48Vdc. Load share (Ishare): This is a single wire analog signal that is generated and acted upon automatically by power supplies connected in parallel. The Ishare pins should be tied together for power supplies if active current share among the power supplies is desired. No resistors or capacitors should get connected to this pin. Remote_ON/OFF: Controls presence of the 12Vdc output voltage. This is an open collector, TTL level control signal that needs to be pulled HI externally through a resistor. A turn OFF command either through this signal (Remote ON/OFF) or firmware commanded would turn OFF the 12V output. Enable: This is a short signal pin that controls the presence of the 12Vdc main output. This pin should be connected to ‘output return’ on the system side of the output connector. The purpose of this pin is to ensure that the output turns ON after engagement of the power blades and turns OFF prior to disengagement of the power blades. Write protect (WP): This signal protects the contents of the EEPROM from accidental over writing. When left open the EEPROM is write protected. A LO (TTL compatible) permits writing to the EEPROM. This signal is pulled HI internally by the power supply. Status signals Output current monitor (Imon): A voltage level proportional to the delivered output current is present on this pin. The signal level is 0. 1V per amp ± 0.25V. AC OK: A TTL compatible status signal representing whether the input voltage is within the anticipated range. This signal is internally pulled HI to 3.3V via a 10kΩ resistor. A (HI) on this signal indicates that the input voltage is applied within the specified input range. DC OK: A TTL compatible status signal representing whether the output voltage is present. This signal is internally pulled HI to 3.3V via a 10kΩ resistor. A (HI) on this signal indicates that the output voltage is present. Over temp warning: A TTL compatible status signal representing whether an over temperature exists. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that temperatures are normal. If an over temperature should occur, this signal would pull LO for approximately 10 seconds prior to shutting down the power supply. The unit would restart if internal temperatures recover within normal operational levels. At that time the signal reverts back to its open collector (HI) state. Fault: A TTL compatible status signal representing whether a Fault occurred. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that no Fault is present. This signal activates for OTP, OVP, OCP, AC fault or No output. PS Present: This pin is connected to ‘output return’ within the power supply. Its intent is to indicate to the system that a power supply is present. This signal may need to be pulled HI externally through a resistor. Interrupt (SMBAlert#): A TTL compatible status signal, representing the SMBusAlert# feature of the PMBus compatible i2C protocol in the power supply. This signal needs to be pulled HI externally through a resistor. Serial Bus Communications The I²C interface facilitates the monitoring and control of various operating parameters within the unit and transmits these on demand over an industry standard I²C Serial bus. All signals are referenced to ‘Signal Return’. Device addressing: The microcontroller (MCU) and the EEPROM have the following addresses: Device Address Address Bit Assignments (Most to Least Significant) MCU 0xBx 1 0 1 1 A2 A1 A0 R/W Broadcast 0x00 0 0 0 0 0 0 0 0 EEPROM 0xAx 1 0 1 0 A2 A1 A0 R/W The Global Broadcast instruction executes a simultaneous write instruction to all power supplies. A read instruction cannot be accessed globally. The three programmable address bits are the same for all I2C accessible devices within the power supply. Address lines (A2, A1, A0): These signal pins allow up to eight (8) modules to be addressed on a single I²C bus. The pins are pulled HI internal to the power supply. For a logic LO these pins should be connected to ‘Output Return’ Serial Clock (SCL): The clock pulses on this line are generated by the host that initiates communications across the I²C Serial bus. This signal is pulled up internally to 3.3V by a 10kΩ |
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