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PI3546-00-LGIZ Datasheet(PDF) 32 Page - Vicor Corporation |
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PI3546-00-LGIZ Datasheet(HTML) 32 Page - Vicor Corporation |
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32 / 37 page  Cool-Power® Rev 1.3 vicorpower.com Page 32 of 37 2/2016 800 927.9474 PI354x-00 VDR Bias Regulator The VDR internal bias regulator is a ZVS switching regulator that resides internal to the PI354x-00 product family. It is intended strictly for use to power the internal controller and driver circuitry. The power capability of this regulator is sized only for the PI354x-00, with adequate reserve for the application it was intended for. It may be used for as a pull- up source for open collector applications and for other very low power use with the following restrictions: 1. No direct connection is allowed. Any noise source that can disturb the VDR voltage can also affect the internal controller operation. 2. All loads must be locally de-coupled using a 0.1 μF ceramic capacitor. This capacitor must be connected to the VDR output through a series resistor no smaller than 1 k. which forms a loss pass filter and limits the total current to 5 mA. System Design Considerations 1. Inductive loads- As with all power electronic applications, consideration must be given to driving inductive loads that may be exposed to a fault in the system which could result in consequences beyond the scope of the power supply primary protection mechanisms. An inductive load could be a filter, fan motor or even excessively long cables. Consider an instantaneous short circuit through an un-damped inductance that occurs when the output capacitors are already at an initial condition of fully charged. The only thing that limits the current is the inductance of the short circuit and any series resistance. Even if the power supply is off at the time of the short circuit, the current could ramp up in the external inductor and store considerable energy. The release of this energy will result in considerable ringing, with the possibility of ringing nodes connected to the output voltage below ground. The system designer should plan for this by considering the use of other external circuit protection such as load switches, fuses, and transient voltage protectors. The inductive filters should be critically damped to avoid excessive ringing or damaging voltages. Adding a high current Schottky diode from the output voltage to PGND close to the PI354x-00 is recommended for these applications. 2. Low voltage operation – there is no isolation from an SELV (Safety-Extra-Low-Voltage) power system. Powering low voltage loads from input voltages as high as 60 V may require additional consideration to protect low voltage circuits from excessive voltage in the event of a short circuit from input to output. A fast TVS (transient voltage suppressor) gating an external load switch is an example of such protection. 3. Use of Lighting Mode (LGH) as a battery charger is certainly very feasible. It is fashionable to design these chargers such that the battery is always connected to it. Since the Buck topology is not isolated, shorting the input terminals or capacitors of an unpowered regulator/charger could allow damaging current flow through the body diode of the high side MOSFET that would be unprotected by a conventional input fuse. It is recommended to connect the PI354x-00 family to the battery using an active ORing device if LGH mode is used as a constant current battery charger. The same should be considered for super-capacitor applications as well. |
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