GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A RoHS Compliant Features • Input Or’ing • Reverse input protection • 3 front panel LEDs: 1-input;2-output; 3 - fault • Output programmable from 10.8 – 13.2VDC • Remote ON/OFF control of the 12VDC output • Remote sense (up to 0.25V) on the 12VDC output • No minimum load requirements • Redundant parallel operation • Active load sharing (single wire) Applications • Hot pluggable • 48VDC distributed power architectures • Efficiency: typically 90% • • Standby orderable either as 3.3VDC or 5VDC Cellular Base Stations • Auto recoverable OC & OT protection • Satellite Hubs • Operating temperature: -10 - 70°C (de-rated above 50°C) • Network Equipment • Digital status & control: I2C and PMBus serial bus • Network Attached Storage • EN/IEC/UL60950-1 2nd edition; UL 1950, CSA C22.2-950 • • CE mark Telecom Access Nodes • EMI: class A FCC docket 20780 part 15, EN55022 • Routers/Switches • Meets EN6100 immunity and transient standards • Broadband Switches • Shock & vibration: NEBS GR-63-CORE, level 3 • ATE Equipment Description The CAR1212DC series of DC-DC Converters provide highly efficient isolated power from DC input mains in a compact 1U industry standard form factor at a power density of 16.2W/in3. These converters complement the CAR1212FP rectifier providing comprehensive solutions for systems connected either to commercial AC mains, 48/60VDC power plants or telecom central offices. This plug and play approach offers significant advantages since systems can be reconfigured and repositioned readily by simply replacing the power supply. The high-density, frontto-back airflow is designed for minimal space utilization and is highly expandable for future growth. The industry standard PMBus compliant I2C communications buss offers a full range of control and monitoring capabilities. The SMBusAlert signal pin alerts customers automatically of any state change within the power supply. * UL is a registered trademark of Underwriters Laboratories, Inc. † CSA is a registered trademark of Canadian Standards Association. VDE is a trademark of Verband Deutscher Elektrotechniker e.V. § This product is intended for integration into end-user equipment. All CE marking procedures of end-user equipment should be followed. (The CE mark is placed on selected products.) ** ISO is a registered trademark of the International Organization of Standards + The PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF) ‡ October 21, 2013 ©2013 General Electric Company. All rights reserved. GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability. Symbol Min Max Unit Input Voltage: Continuous Parameter VIN 0 75 VDC Operating Ambient Temperature TA -10 70 °C Tstg -40 85 °C 1500 VDC Storage Temperature I/O Isolation voltage (100% factory Hi-Pot tested) 1 Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage, load, and temperature conditions. INPUT Parameter Symbol Operational Range Min Typ Max -36 -48/60 -75 VIN 12VDC output turned OFF -35 12VDC output turned ON Unit VDC -36 Idling Power 12VDC output OFF 12VDC output ON Maximum Input Current VIN= -36VDC (VOUT= VO, set, IOUT=IO, max) Cold Start Inrush Current (Excluding x-caps, 25°C, <10ms, per ETSI 300-132) Efficiency 45 Holdup time (VIN= -48VDC, VOUT ≥ 10.8Vdc, TAMB 25°C, IOUT=IO, max) W IIN 38 ADC IIN 40 APEAK 90 η (Tamb=25°C, VIN= -48VDC, VOUT= 12VDC, 60-80% load) Isolation 35 W T % 2.5 ms Input/Output 1500 Input/Frame 1500 VDC VDC Output/Frame 100 VDC 12VDC MAIN OUTPUT Parameter Output power Set point Overall regulation (load, temperature) Remote sense @ 50% load sum of hot & return Symbol Min Typ Max Unit POUT 0 11.9 -2 12.00 1200 12.1 +2 W VDC % VOUT Ripple and noise 2 1 2 0.25 120 VDC mVp-p Derated above 50°C at 2.5%/°C Measured across a 10µf tantalum and a 0.1µf ceramic capacitors in parallel. 20MHz bandwidth October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 2 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A 12VDC MAIN OUTPUT (continued) Parameter Symbol Turn-ON overshoot Turn-ON delay Min Typ Max Unit VOUT 3 % T 2 sec Remote ON/OFF delay time 40 ms Turn-ON rise time (10 – 90% of VOUT) 60 ms -5 +5 % 10.8 13.2 VDC 14.5 15.5 VDC 0 100 ADC 110 130 ADC IOUT -5 +5 % of FL Symbol Min Typ Max Unit Set point (optional 5Vstb) VOUT 3.2 3.3 3.4 VDC Overall regulation (load, temperature, aging) VOUT -5 +5 % 66 mVp-p Transient response 50% step [10%-60%, 50% - 100%] (dI/dt – 1A/µs, recovery 300µs) Programmable range (hardware 3 & software) VOUT Overvoltage protection, latched (recovery by cycling OFF/ON via hardware or software) Output current VOUT= 12VDC IOUT IOUT Current limit, Hiccup Short circuit protection with auto recovery Active current share 3.3VDC (5VDC) STANDBY OUTPUT Parameter Ripple and noise 50 Output current IOUT 0 4 1 ADC General Specifications Parameter Reliability, Min 25C, full load Typ Max Weight Notes Hrs MTBF per SR232 Reliability protection for electronic equipment, method I, case III, 10 Yrs Full load, excluding fans 1.45 (3.2) Kgs (Lbs) 250,000 Service Life Units Feature Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information. Parameter Symbol Min Typ Max Unit Remote ON/OFF (Pulled HI internally within the module ≈ 40kΩ to 5VDC) Logic High (Module ON) – either N/C or apply V > 3VDC Logic Low (Module OFF) 3 4 20 µA VIH 0.7VDD 12 VDC IIL 1 mA VIL 0 0.8 VDC IIH Setpoint can be voltage programmable or programmed by a resistor divider. An internal 20kΩ from Vprog to 3.3Vdc is provided. Add a resistor to complete the divider from Vprog to output_return. Measured at the output with 0.1µf ceramic and a 10µf tantalum capacitor in parallel. 20mHz bandwidth limitation. October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 3 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Feature Specifications (continued) Parameter Symbol Min Typ Max Unit Output Voltage programming (Vprog) Equation: VOUT = 10.8 + (Vprog * 0.96) Vprog range Vprog 0 2.5 VDC Programmed output voltage range Vo 10.8 13.2 VDC Voltage adjustment resolution (8-bit A/D) Vo 10 mVDC Output configured to 13.2VDC Vprog 2.5 3.0 VDC Output configured to the 12VDC set-point Vprog 3.0 VDC 12V output OFF VI 0.7VDD 12 VDC 12V output ON VI 0 0.8 VDC VI VI 0.7VDD 0 12 0.8 VDC VDC 20 µA Enable [short pin controlling presence of the 12VDC output] Write protect (Wp) Write protect enabled Write protect disabled INPUT-OK (Pulled up internally to 3.3V via a 10kΩ resistor) Logic High (Input within normal range) IOH Logic Low (Input out of range) VOH 0.7VDD 12 VDC IOL 20 mA VOL 0 0.4 VDC 20 µA DC-OK (Pulled up internally to 3.3V via a 10kΩ resistor) Logic High (Output voltage is present) IOH Logic Low (Output voltage is not present) VOH 0.7VDD 12 VDC IOL 20 mA VOL 0 0.4 VDC 20 µA VOH 0.7VDD 12 VDC Temperature OK (Pulled up internally to 3.3V via a 10kΩ resistor) Logic High (temperature within normal range) IOH Logic Low (temperature is too high) Delayed shutdown after Logic Low transition IOL 20 mA VOL 0 0.4 VDC Tdelay 10 sec Fault (Pulled up internally to 3.3V via a 10kΩ resistor) Logic High (No fault is present) Logic Low (Fault is present) 20 µA VOH 0.7VDD 12 VDC IOH IOL 20 mA VOL 0 0.4 VDC VIL 0 0.1 VDC PS Present Logic High (Power supply is not plugged in) Logic Low (Power supply is present) October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 4 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Feature Specifications (continued) Parameter Symbol Min Typ Max Unit 20 µA VOH 0.7VDD 12 VDC IOL 20 mA VOL 0 0.4 VDC SMBAlert# (Interrupt) (Pulled up internally to 3.3V via a 10kΩ resistor) Logic High (No Alert - normal) IOH Logic Low (Alert is set) Output current monitor (Imon) Resolution 100 Accuracy mV/A -250 +250 mV Measurement range Io 0 100 ADC Analog output range Vmon 0 10 VDC 5 mADC Max Unit Sourced output current Io Digital Interface Specifications Parameter Conditions Symbol Min Typ Input Logic High Voltage (CLK, DATA) VIH 2.1 3.6 VDC Input Logic Low Voltage (CLK, DATA) VIL 0 0.8 VDC IIH 0 PMBus Signal Interface Characteristics Input high sourced current (CLK, DATA) Output Low sink Voltage (CLK, DATA, SMBALERT#) IOUT=3.5mA Output Low sink current (CLK, DATA, SMBALERT#) Output High open drain leakage current (CLK,DATA, SMBALERT#) PMBus Operating frequency range VOL 10 μA 0.4 VDC IOL 3.5 mA VOUT=3.6V IOH 0 10 μA Slave Mode FPMB 10 400 kHz 25 ms Measurement System Characteristics Clock stretching IOUT measurement range tSTRETCH Linear IRNG 0 100 ADC IACC -10 +10 % Linear VOUT(rng) 0 14 VDC VOUT(acc) -5 +5 % Linear Temp(rng) 0 120 °C Temp(acc) -5 +5 % IOUT measurement accuracy 25°C VOUT measurement range VOUT measurement accuracy Temp measurement range Temp measurement accuracy 5 5 Temperature accuracy reduces non-linearly with decreasing temperature October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 5 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Environmental Specifications Max Units Ambient Temperature Parameter -10 6 Min Typ 70 °C Storage Temperature -40 85 °C 2250/7382 m / ft 8200/30k m / ft Power Derating with Temperature 2.5 %/°C Operating Temperature Derating with Altitude 2.0 °C/305 m °C/1000 ft Operating Altitude Non-operating Altitude Acoustic noise 55 Humidity Operating Storage dbA 30 10 Shock and Vibration acceleration Earthquake Rating Notes Air inlet from sea level to 5,000 feet. 51°C to 70°C 7 Above 2250/7382 m/ft; 3962/13000 m/ft max 25°C, half load 95 95 % % 6 Grms NEBS GR-63-CORE, Level 3, 20 -2000Hz, min 30 minutes Zone NEBS GR-63-CORE, all floors, Seismic Zone 4 Designed and tested to meet NEBS specifications. 4 Relative humidity, non-condensing EMC Compliance EMC Parameter Criteria Enclosure immunity 7 Test EN55022, FCC Docket 20780 part 15, subpart J Telcordia GR1089-CORE, Class A A 0.15 – 30MHz Radiated emissions EN55022 A 30 – 10000MHz Voltage dips EN61000-4-11 B -30%, 10ms B -60%, 100ms Voltage surge EN61000-4-5 B -100%, 5sec A 2kV, 1.2/50µs, common mode A 1kV, 1.2/50µs, differential mode Fast transients EN61000-4-4 B 5/50ns, 1kV (common mode) Conducted RF fields EN61000-4-6 A 130dBµV, 0.15-80MHz, 80% AM Radiated RF fields EN61000-4-3, level 3 A 10V/m, 80-1000MHz, 80% AM ENV50140 A EN61000-4-2, level 3 B ESD 6 Level Conducted emissions DC input DC input immunity Standard 6kV contact, 8kV air Designed to start at an ambient down to -40°C; meet spec after ≅ 30 min warm up period, may not meet operational limits below -10°C. The maximum operational ambient is reduced in Europe in order to meet certain power cord maximum ratings of 70°C. The maximum operational ambient where 70°C rated power cords are utilized is reduced to 60°C until testing demonstrates that a higher level is acceptable. October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 6 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Characteristic Curves The following figures provide typical characteristics for the CAR1212DC converter at 25oC 95 VIN(V) (50V/div), VO (V) (5V/div) V3.3(V) (2V/div), DCOK (2V/div) Input EFFICIENCY, η (%) 90 85 80 75 3.3Vsb DCOK 12V 70 10 30 50 70 90 110 Output current, A TIME, t (50ms/div) Figure 1. Converter Efficiency versus Output Current. Figure 2. Input start up (Vin: -48VDC, full load). 3.3Vsb DCOK 12V OUTPUT VOLTAGE VO (V) (5V/div) VON(V) (5V/div), VO (V) (5V/div) V3.3 (V) (2V/div), DCOK (2V/div) Remote ON/OFF TIME, t (2ms/div) TIME, t (5ms/div) Figure 3. Start-up Using Remote On/Off (Vin: -48VDC, full load) Figure 4. 12V start-up (Vin: -48VDC, full load) OUTPUT VOLTAGE VO (V) (50mV/div) VON(V) (5V/div), VO (V) (5V/div) V3.3 (V) (2V/div), DCOK (2V/div) Remote ON/OFF 3.3Vsb DCOK 12V TIME, t (5µs/div) TIME, t (10ms /div) Figure 5. 12V output ripple and noise (Vin: -48VDC, full load). October 21, 2013 Figure 6. Turn-OFF via Remote ON/OFF (Vin: -48VDC, full load) ©2013 General Electric Company. All rights reserved. Page 7 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Characteristic Curves (continued) IO (I) (50A/div) OUUTPUT CURRENT OUTPUT VOLTAGE VO (V) (200mV/div) IO (I) (50A/div) VO (V) (200mV/div) OUTPUT VOLTAGE OUUTPUT CURRENT The following figures provide typical characteristics for the CAR1212DC converter at 25oC. TIME, t (1ms/div) TIME, t (1ms/div) SYSTEM CURRENT Figure 7. Transient response 12VDC output load step 10 – 60A, VIN = -48VDC. Io 0A 20 A 40 A 60 A 80 A 100 A 120 A 140 A 160 A 180 A 200 A Figure 8. Transient response 12VDC output load step 50 – 100A, VIN = -48VDC. PS1 I1 (A) - PS2 I2 (A) - % Share - 8.10 17.30 28.30 39.40 50.00 60.90 70.40 80.90 91.40 101.90 11.80 22.70 31.40 40.80 50.30 59.60 69.40 79.70 89.50 98.80 18.59 13.50 5.19 1.75 0.30 1.08 0.72 0.75 1.05 1.54 CONDITION No Load Max Load VOUT @ TURN ON 32.7VDC 32.6VDC VOUT @ TURN OFF 29.5VDC 30.5VDC INDIVIDUAL UNIT CURRENTS AND % SHARE INPUT VOLTAGE VIN(V) (20V/div) OUTPUT VOLTAGE VO (V) (5V/div) IO(I) (100A/div) Table 10. Input Turn OFF and Turn ON. VO (V) (5V/div) OUTPUT VOLTAGE OUUTPUT CURRENT Table 9. Current share between two modules TIME, t (500ms/div) Figure 11. Overload: output short circuit performance, the unit is in hiccup mode. , VIN = -48VDC. October 21, 2013 TIME, t (1ms/div) Figure 12. Holdup time: full load Vin = -48VDC duration: 2.84ms ©2013 General Electric Company. All rights reserved. Page 8 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A 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 from 10.8VDC to 13.2VDC. The equation of this signal is: VOUT = 10.8 + (Vprog * 0.96) where Vprog = 0.1 to 2.5V Between 2.5 and 3V the output stays at 13.2VDC. If Vprog is > 3V, or left open, the programming signal is ignored and the unit output is set at the setpoint of 12VDC. 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 main 12VDC output voltage on the output connector. This signal is pulled HI internally. Leaving this pin a no-connect turns ON the 12VDC output. Applying a Logic 0 (TTL LO level) to this pin turns OFF the 12VDC output. 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 on the output connector. 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. INPUT OK: A TTL compatible status signal representing whether the input voltage is within the anticipated range. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that the input voltage is applied within the specified input range. Temperature OK: 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 reduce 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, INPUT 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 to detect a missing module. 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. Open collector (HI) on this signal indicates that no Interrupt has been triggered. Serial Bus Communications The I²C interface incorporated within the CAR1212DC modules 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 MCU Broadcast EEPROM Address 0xBx 0x00 0xAx 1 0 1 Address Bit Assignments (Most to Least Significant Bit) 0 1 1 A2 A1 A0 R/W 0 0 0 0 0 0 0 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) CAR1212DC 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 resistor. The end user should add additional pull up resistance as necessary to ensure that rise and fall time timing and the maximum sink current is in compliance to the I²C specifications. Serial Data (SDA): This line is a bi-directional data line. . This signal is pulled up internally to 3.3V by a 10kΩ resistor. The end user should add additional pull up resistance as necessary to ensure that rise and fall time timing and the maximum sink current is in compliance to the I²C specifications. DC OK: A TTL compatible status signal representing whether the output voltage is present. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that the output voltage is present. October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 9 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Digital Feature Descriptions The signal will be triggered for any state change, including the following conditions; PMBus™ compliance: The power supply is fully compliant to the Power Management Bus (PMBus™) rev1.2 requirements. • • • • • • • • Manufacturer specific commands located between addresses 0xD0 to 0xEF provide instructions that either do not exist in the general PMBus specification or make the communication interface simpler and more efficient. Master/Slave: The ‘host controller’ is always the MASTER. Power supplies are always SLAVES. SLAVES cannot initiate communications or toggle the Clock. SLAVES also must respond expeditiously at the command of the MASTER as required by the clock pulses generated by the MASTER. Clock stretching: The ‘slave’ µController inside the power supply may initiate clock stretching if it is busy and it desires to delay the initiation of any further communications. During the clock stretch the ‘slave’ may keep the clock LO until it is ready to receive further instructions from the host controller. The maximum clock stretch interval is 25ms. The host controller needs to recognize this clock stretching, and refrain from issuing the next clock signal, until the clock line is released, or it needs to delay the next clock pulse beyond the clock stretch interval of the power supply. Note that clock stretching can only be performed after completion of transmission of the 9th ACK bit, the exception being the START command. Clock Stretch Figure 13. Example waveforms showing clock stretching. I²C Bus Lock-Up detection: The device will abort any transaction and drop off the bus if it detects the bus being held low for more than 35ms. Communications speed: Both 100kHz and 400kHz clock rates are supported. The power supplies default to the 100kHz clock rate. The minimum clock speed specified by SMBus is 10 kHz. Packet Error Checking (PEC): Although the power supply will respond to commands with or without the trailing PEC, it is highly recommended that PEC be used in all communications. The integrity of communications is compromised if packet error correction is not employed. There are many functional features, including turning OFF the main output, that should require validation to ensure that the correct command is executed. PEC is a CRC-8 error-checking byte, based on the polynomial C(x) = x8 + x2 + x + 1, in compliance with PMBus™ requirements. The calculation is based in all message bytes, including the originating write address and command bytes preceding read instructions. The PEC is appended to the message by the device that supplied the last byte. SMBAlert#: The µC driven SMBAlert# signal informs the ‘master/host’ controller that either a STATE or ALARM change has occurred. Normally this signal is HI. The signal will change to its LO level if the power supply has changed states and the signal will be latched LO until the power supply either receives a ‘clear’ instruction as outlined below or executes a READ STATUS_WORD. If the alarm state is still present after the STATUS registers were reset, then the signal will revert back into its LO state again and will latch until a subsequent reset signal is received from the host controller. October 21, 2013 VIN and under or over voltage IOUT over current Over Temperature warning or fault Fan Failure Communication error PEC error Invalid command Internal faults The power supply will clear the SMBusAlert# signal (release the signal to its HI state) upon the following events: • • Receiving a CLEAR_FAULTS command The main output recycled (turned OFF and then ON) via the ENABLE signal pin The main output recycled (turned OFF and then ON) by the OPERATION command Execution of a READ of the STATUS_WORD register • • Global broadcast: This is a powerful command because it can instruct all power supplies to respond simultaneously in one command. But it does have a serious disadvantage. Only a single power supply needs to pull down the ninth acknowledge bit. To be certain that each power supply responded to the global instruction, a READ instruction should be executed to each power supply to verify that the command properly executed. The GLOBAL BROADCAST command should only be executed for write instructions to slave devices. Read back delay: The power supply issues the SMBAlert # notification as soon as the first state change occurred. During an event a number of different states can be transitioned to before the final event occurs. If a read back is implemented rapidly by the host a successive SMBAlert# could be triggered by the transitioning state of the power supply. In order to avoid the triggering of successive SMBAlert# s and thus reading a transitioning state, it is prudent to wait more than 2 seconds after the receipt of an SMBAlert# before executing a read back. This delay will ensure that only the final state of the power supply is captured. Successive read backs: Successive read backs to the power supply should not be attempted at intervals faster than every one second. This time interval is sufficient for the internal processors to update their data base so that successive reads provide fresh data. PMBusTM Commands Standard instruction: Up to two bytes of data may follow an instruction depending on the required data content. Analog data is always transmitted as LSB followed by MSB. PEC is optional and includes the address and data fields. 1 S 8 Slave address 8 Low data byte Wr 1 A 1 A 8 Command Code 8 High data byte 1 A 1 A 8 PEC 1 A 1 P Master to Slave Slave to Master SMBUS annotations; S – Start , Wr – Write, Sr – re-Start, Rd – Read, A – Acknowledge, NA – not-acknowledged, P – Stop ©2013 General Electric Company. All rights reserved. Page 10 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A PMBusTM Command set: Standard READ: Up to two bytes of data may follow a READ request depending on the required data content. Analog data is always transmitted as LSB followed by MSB. PEC is optional and includes the address and data fields. 1 S 7 Slave address 1 Sr 1 Wr 7 Slave Address 8 MSB 1 A 8 Command Code 1 A 8 LSB 1 Rd 1 A 8 PEC Command Operation ON_OFF_config Clear_faults Write_protect Store_default_all Restore_default_all Vout_mode Vout_command Fan_config_1_2 Fan_command_1 Vout_OV_fault_limit Vout_OV_fault_response Vout_OV_warn_limit Iout_OC_fault_response 1 A 1 A 1 No-ack 1 P Block instruction: When writing or reading more than two bytes of data at a time BLOCK instructions for WRITE and READ commands must be used instead of the Standard Instructions. Block write format: 1 S 7 Slave address 8 Byte count = N 8 ………. 1 Wr 1 A 1 A 8 Data 1 1 A 8 Command Code 1 A 8 Data 48 8 Data 2 1 A 1 A 1 A 8 PEC 1 A 1 P Block read format: 1 S 7 Slave address 1 Sr 1 Wr 7 Slave Address 8 Byte count = N 8 ………. 1 A 1 A 1 A 1 Rd 8 Command Code 1 A 1 A 8 Data 1 1 A 8 Data 48 1 A 8 Data 2 1 A 8 PEC 1 NoAck 1 P Linear Data Format The definition is identical to Part II of the PMBus Specification. All standard PMBus values, with the exception of output voltage related functions, are represented by the linear format described below. Output voltage functions are represented by a 16 bit mantissa. Output voltage has a E=9 constant exponent. The Linear Data Format is a two byte value with an 11-bit, two’s complement mantissa and a 5-bit, two’s complement exponent or scaling factor, its format is shown below. Bit 7 Data Byte High 6 5 4 3 2 1 Exponent (E) 0 7 Data Byte Low 6 5 4 3 2 Mantissa (M) 1 The relationship between the Mantissa, Exponent, and Actual Value (V) is given by the following equation: V = M ∗ 2E Where: V is the value M is the 11-bit, two’s complement mantissa E is the 5-bit, two’s complement exponent October 21, 2013 0 Iout_OC_warn_limit OT_fault_limit OT_fault_response OT_warn_limit Status_byte Status_word Status_Vout Status_Iout Status_input Status_temperature Status_CML Status_mfr_specific Status_fan_1_2 Read_Vout Read_Iout Read_temperature_1 PMBus revision Read fan_speed Mfr_ID Mfr_model Mfr_revision Mfr_location Mfr_date Mfr_serial Mfr_Vin_min Mfr_Vin_max Mfr_Iin_max Mfr_Pin_max Mfr_Vout_min Mfr_Vout_max Mfr_Iout_max Mfr_Pout_max Mfr_Tambient_max Mfr_Tambient_min FRW_revision Fan_duty_cycle_ I2C OTF_RECOVERY_I2C DCOKHI_ I2C DCOKLO_ I2C ©2013 General Electric Company. All rights reserved. Hex Data Write Code Byte Function 01 1 W Output ON/OFF 02 1 03 0 Clear Status 10 1 W Write control 11 0 W Store permanently 12 0 Reset defaults 20 1 Vout constants 21 2 W Set Vout 3A 1 W RPM or duty cycle 3B 2 W Set fan speed 40 2 W Set OV fault limit 41 1 Latch only 42 2 W Set OV warn limit W Latch, restart, 47 1 folddown W Set OC warn limit 4A 2 W Set OT fault limit 4F 2 W Latch, restart 50 1 W Set OT warn limit 51 2 78 1 79 2 7A 1 7B 1 7C 1 7D 1 7E 1 80 1 81 1 8B 2 Read Vout 8C 2 Read Iout 8D 2 Read Temperature 98 1 90 2 Read speed in RPM 99 5 FRU_ID 9A 16 9B 4 9C 4 9D 6 9E 15 A0 2 36V (linear format) A1 2 75V (linear format) A2 2 40A (linear format) A3 2 1400W (linear format) A4 2 10V (linear format) A5 2 15V (linear format) A6 2 100A (linear format) A7 2 1200W (linear format) A8 2 70C (linear format) A9 2 -10C (linear format) D0 1 Duty_cycle read in % D6 1 E5 2 E6 E7 2 2 Recovery hysteresis °C (1/512V) (1/512V) Page 11 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Status Register Bit Allocation: Register Status_Byte [ 0 – normal 1 – fault] Status_word (includes Status_byte) [ 0 – normal 1 – fault] Status_Vout [ 0 – normal 1 – fault] Status_Iout [ 0 – normal 1 – fault] Hex Code 78 79 7A 7B Status_input [ 0 – normal 1 – fault] 7C Status_temperature [ 0 – normal 1 – fault] 7D Status_cml [ 0 – normal 1 – fault] 7E Data Byte 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Function Busy DC_ OFF Output OV Fault Output OC Fault Input UV Fault Temp Fault/warning CML (communication fault) None of Below OV Fault/Warning detected OC Fault/Warning detected Input Fault/Warning Mfr_specific register change nPower_Good Fan Fault or Warning Other fault Unknown Vout OV Fault Vout OV Warning Vout UV Warning Vout UV Fault N/A N/A N/A N/A IOUT OC Fault N/A IOUT OC Warning N/A N/A N/A N/A N/A Vin OV Fault Vin OV Warning Vin UV Warning Vin UV Fault N/A N/A N/A N/A OT Fault OT Warning N/A N/A N/A N/A N/A N /A Invalid/Unsupported Command Invalid/Unsupported Data Packet Error Check Failed Memory Fault Detected Processor Fault Detected Reserved Other Communications Fault Other Memory or Logic Fault Register Status_mfr_specific [ 1 – normal 0 –fault] Status_fan_1_2 [ 0 – normal 1 – fault] Hex Code 80 81 Data Byte 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Function 3.3V_fault OVSD Interrupt Fault detected PS_remote_OFF DC_fault INPUT_fault N/A Fan 1 Fault Fan 2 Fault N/A N/A Fan 1 Speed Overridden Fan 2 Speed Overridden N/A N/A Command Descriptions Operation (01) : By default the Power supply is turned ON at power up as long as Power ON/OFF signal pin is active HI. The Operation command is used to turn the Power Supply ON or OFF via the PMBus. The data byte below follows the OPERATION command. FUNCTION Unit ON Unit OFF DATA BYTE 80 00 To RESET the power supply cycle the power supply OFF, wait at least 2 seconds, and then turn back ON. All alarms and shutdowns are cleared during a restart. Clear_faults (03): This command clears all STATUS and FAULT registers and resets the SMBAlert# line. If a fault still persists after the issuance of the clear_faults command the specific registers indicating the fault are reset and the SMBAlert# line is activated again. WRITE_PROTECT register (10): Used to control writing to the PMBus device. The intent of this command is to provide protection against accidental changes. All supported command parameters may have their parameters read, regardless of the write_protect settings. The contents of this register can be stored to non-volatile memory using the Store_default_code command. The default setting of this register is disable_all_writes except write_protect 0x80h. This default cannot be changed. FUNCTION Enable all writes Disable all writes except write_protect Disable all writes except write_protect and OPERATION DATA BYTE 00 80 Vout_Command (21) : This command is used to change the output voltage of the power supply. Changing the output voltage should be performed simultaneously to all power supplies operating in parallel using the Global Address (Broadcast) feature. If only a single power supply is instructed to change its output, it may attempt to source all the required power which can cause either a power limit or shutdown condition. Software programming of output voltage permanently overrides the set point voltage configured by the Vprog signal pin. The program no longer looks at the ‘Vprog pin’ and will not respond to any hardware voltage settings. If power is removed from the µController it will reset itself into its default configuration looking at the Vprog signal for output voltage control. In many applications, October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 12 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A the Vprog pin is used for setting initial conditions, if different that the factory setting. Software programming then takes over once I2C communications are established. Mfr-revision (9B): Total 4 bytes Vout_OV[OT]_fault_limit (40[4F]): Provides the capability to change the OV[OT] shutdown limit. No sanity check exists to ensure that the changed value is within the expected range. However, if the value exceeds the maximum limit, the program will default to the maximum value. Example: FF is read as 16.16 11 is read as 1.1 Vout_OV[OT]_warn_limit (42[51]): OV[OT]_warning is extremely useful because it gives the system controller a heads up that the output voltage/temperature is drifting out of regulation and the power supply is close to shutting down. Preemptive action may be taken before the power supply would shut down and potentially disable the system. OC and OT_fault_ response (47, 50): The default response for OC is latched on fault. The response for OT is auto_restart once internal temperatures cool down. Each byte is partitioned into high and low nibbles. Series Hardware Rev Primary µC Secondary µC Mfr_serial (9E): Product serial number includes the manufacturing date, manufacturing location in up to 15 characters. For example: 13KZ51018193xxx, is decoded as; 13 – year of manufacture, 2013 KZ – manufacturing location, in this case Matamoros 51 – week of manufacture Restart after a latch off: Either of four restart possibilities are available. The hardware pin Remote ON/OFF may be turned OFF and then ON. The unit may be commanded to restart via i2c through the Operation command by first turning OFF then turning ON . The third way to restart is to remove and reinsert the unit. The fourth way is to turn OFF and then turn ON ac power to the unit. The fifth way is by changing firmware from latch off to restart. Each of these commands must keep the power supply in the OFF state for at least 2 seconds, with the exception of changing to restart. 018193xxx – serial #, mfr choice note: if the additional xxx space is not utilized then F’s are filled in, (i.e. 018193FFF), ensuring that the actual serial number is clearly identified. A power system that is comprised of a number of power supplies could have difficulty restarting after a shutdown event because of the non-synchronized behavior of the individual power supplies. Implementing the latch-off mechanism permits a synchronized restart that guarantees the simultaneous restart of the entire system. Control and Read accuracy: A synchronous restart can be implemented by; 1. Issuing a GLOBAL OFF and then ON command to all power supplies, 2. Toggling Off and then ON the Remote ON/OFF signal 3. Removing and reapplying input commercial power to the entire system. The power supplies should be turned OFF for at least 20 – 30 seconds in order to discharge all internal bias supplies and reset the soft start circuitry of the individual power supplies. Auto_restart: Auto-restart is the default configuration for recovering from over-current and over-temperature shutdowns. An overvoltage shutdown is followed by three attempted restarts, each restart delayed 1 second, within a 1 minute window. If within the 1 minute window three attempted restarts failed, the unit will latch OFF. If less than 3 shutdowns occur within the 1 minute window then the count for latch OFF resets and the 1 minute window starts all over again. Status_word (79): returns two bytes of information. The upper byte bit functionality is tabulated in the Status_word section. The lower byte bit functionality is identical to Status_byte. Fan_speed (3B): Fan speed can be controlled either by changing the RPM or duty cycle via register 3B. Selection of RPM or duty cycle control is accomplished by bit 6 of the FAN_CONFIG_1_2 (3A) command. The default mode is xxxx The speed of the fan cannot be reduced below what the power supply requires for its operation. The number represented in register D6 is an unsigned number, it is not in linear format. Invalid commands or data: The power supply notifies the MASTER if a non-supported command has been sent or invalid data has been received. Notification is implemented by setting the appropriate STATUS and ALARM registers and setting the SMBAlert# flag. An invalid command always returns a value of 0 x 00. The estimates below are believed to be reasonable under most operating conditions. However, these are typical numbers and not hard bound values that cannot be exceeded. In most nominal operating conditions the returned values are significantly better than these estimates. FUNCTION Vout_command Vout_OV_fault_limit Iout_OC_warn_limit OT_warn_limit Read_Vout Read_Iout Read_temperature ACCURACY ± 3% ± 3% ± 4% of FL ± 5°C 8 ± 3% ± 4% of FL ± 5°C 9 EEPROM The microcontroller has 96 bytes of EEPROM memory available for the system host. Another separate EEPROM IC will provide another 128 bytes of memory with write protect feature. LEDs Three LEDs are located on the front faceplate. When the LEDs are ON GREEN then input and output are normal. When the FAULT_LED is RED, then a fault condition exists and the power supply may not provide output power. The table below further defines these states: Mfr_ID (99): Manufacturer in ASCII – 5 characters maximum, General Electric – Critical Power represented as, GE-CP 8 Accuracy is estimated near the shutdown point around 100°C. At lower temperatures the accuracy is much reduced. 9 Accuracy is estimated near the shutdown point around 100°C. At lower temperatures the accuracy is much reduced. October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 13 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Alarm Table LED Indicator Monitoring Signals Test Condition INPUT OK DC OK FAULT FAULT DC OK INPUT OK TEMP OK 1 2 3 Normal Operation Low or NO INPUT OVP Green Green OFF Green OFF OFF OFF RED RED High Low Low High Low Low High Low High High High High 4 Over Current Green OFF RED Low Low High High 5 Over Temp Fault Green OFF RED Low Low High Low Note: Test condition #2 has 2 modules working in parallel. One module is running and the other has no input. October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 14 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Outline Drawing C1 RED LED (FAULT) Connector Pin Assignments Input/Output Molex P/N: 46437-1041 Mating connector: Molex P/N: 46436-1041 A B C Pin Function Pin Function Pin Function Pin Function A1 Vprog B1 Write Protect (WP) C1 Remote ON/OFF P1 VIN ( + ) A2 PS Present B2 DC OK C2 2 SDA (I C bus) P2 VIN ( - ) [return] A3 OVP Test Point B3 INPUT OK C3 SCL (I C bus) P3 GND A4 Fault B4 VSTDBY return C4 Vstb return A5 Remote Sense ( + ) B5 SMBAlert (Interrupt) C5 I2C Address (A2) P4 – P6 +12VDC A6 Temperature OK B6 I Monitor (IMON) B7 VSTDBY [3.3V] I C Address (A1) I2C Address (A0) Power Return N/C C6 C7 P7 – P9 A7 A8 Remote Sense ( - ) B8 Enable (short pin) C8 Ishare October 21, 2013 2 2 ©2013 General Electric Company. All rights reserved. Page 15 GE Data Sheet CAR1212DC series DC-DC converter Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A Ordering Information Please contact your GE Energy Sales Representative for pricing, availability and optional features. PRODUCT DESCRIPTION PART NUMBER 1200W converter 12VDC DC-DC converter w/Bezel, 3.3Vaux CAR1212DCBXXZ01A 1200W converter 12VDC DC-DC converter w/Bezel, 5Vaux CAR1212DCBX5Z01A PART NUMBER DEFINITION GUIDE EXAMPLE CAR 12 12 DC Output Power 08 = 850W Output voltage 12 = 12Vdc Type FP – AC; Vo-positive DC - DC x x x Options B – bezel R – reverse airflow Vsb = 5 Z 01 A A – Standard model RTM RoHS Blank – non compliant Y – 5 of 6 compliant Z – 6 of 6 compliant Contact Us For more information, call us at USA/Canada: +1 888 546 3243, or +1 972 244 9288 Asia-Pacific: +86.021.54279977*808 Europe, Middle-East and Africa: +49.89.878067-280 India: +91.80.28411633 www.ge.com/powerelectronics October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 16