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IQ65033QMA10NRS-G Datasheet(PDF) 8 Page - SynQor Worldwide Headquarters |
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IQ65033QMA10NRS-G Datasheet(HTML) 8 Page - SynQor Worldwide Headquarters |
8 / 15 page Input: Outputs: Current: Package: 36-75 V 5.0 V/ 3.3 V 10 A Quarter-brick Product # IQ65033QMA10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IQ5033S Rev. G 05/04/09 Page 8 Technical Specification FEATURE DESCRIPTIONS Figure A: Internal Block Diagram 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 9 8 15 16 17 18 Isolation barrier E F dV/dt sense F E E F 10 11 12 Monitoring circuits Input ORing MOSFETs: ORing of dual -48V feeds is provided by four MOSFETs, which are individually controlled so as to oper- ate 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. 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 out- put 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 fail- ure. 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 report- ing 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. |
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