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IQ65033QGA12xyz-G Datasheet(PDF) 8 Page - SynQor Worldwide Headquarters |
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IQ65033QGA12xyz-G Datasheet(HTML) 8 Page - SynQor Worldwide Headquarters |
8 / 14 page Product # IQ65033QGA12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006070 Rev. B 09/06/2012 Page 8 Outputs: Current: Package: 5.0V/ 3.3V 10A Quarter-brick Input:34-75 V Outputs:3.3 V & 5.0 V Current:12A Package:Quarter-brick Application Section FEATURE DESCRIPTIONS Input ORing MOSFETs: ORing of dual -48V feeds is provided by four MOSFETs, which are individually controlled so as to operate as an ideal diode (see Figure A). If there is an input feed short of any kind, a control circuit will detect reverse current and turn off the MOSFET in 250ns (typ.), to avoid disturbing the other feed voltage. At zero current, the MOSFET is guaranteed to be off. In the case of a fuse failure, this triggers the ALARM output, due to an apparent input feed loss. Current hysteresis prevents limit cycling around the transition point between body diode and MOSFET conduction. Due to the ‘Turn On Current’ feature, at fixed Input- Voltages the Output Voltage will experience one or two Diode drops (0.6V or 1.2V) for currents at or below ‘Turn On Current’ thresholds. ALARM Output: The ALARM pin gives an external indication of a fault condition. It is an isolated and buffered open-collector output, which is normally pulled low. In the presence of an input feed loss (which can be caused by a fuse failure), the ALARM output will be tri-stated. External Input Fuse Failure Detection: At zero current, the input ORing MOSFETs are guaranteed to be off. In the case of a fuse failure, an on-board bleed resistor pulls the input feed voltage down. This triggers the ALARM output due to an apparent input feed loss. There are two main down-sides to this approach. First, there is no way to distinguish between a feed loss and a fuse failure. Second, an enable fuse loss is not detected, since the enables are diode OR’d. The full featured version of the iQor offers additional data reporting that makes full fuse detection possible. Among other data, each feed voltage and each enable voltage is reported through the I2C port. These voltages can be compared with the voltages reported by the shelf manager to determine whether any board fuse is blown. Input Enable: The ENABLE_A/B signals connect to VRTN_A/B on the backplane via the shortest pins in the zone 1 connector. They are the last pins to mate during board insertion, and the first to disconnect during board extraction. The ENABLE_A and ENABLE_B signals are diode-ORed together which lets either signal enable the module. Whenever both ENABLE pins are open, the hot-swap switch is opened. This prevents -48V output power from being drawn though the EARLY pre-charge resistors. A EMI Filter Hot Swap Control Logic Current- controlled hold- up charging converter Hold-up connect control circuits Management Power converter FET control FET control FET control FET control Dis- charge Enable Logic A B C D B C D Temp sense -48_B ENABLE_A ENABLE_B -48_A VRTN_A VRTN_B SHELF_GND 3.3V 5.0 V -48V_OUT VRTN_OUT HU_TRIM HU_CAP 5 6 3 4 1 2 7 4 1 3 1 8 9 15 16 17 18 Isolation barrier E F dV/dt sense F E E F 10 11 12 Monitoring circuits Figure A: Internal Block Diagram |
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