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32785 Datasheet(PDF) 7 Page - Vicor Corporation |
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32785 Datasheet(HTML) 7 Page - Vicor Corporation |
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7 / 15 page  Picor Corporation • picorpower.com Preliminary PI3106-01-HVIZ Rev 1.3, Jan 17 th, 2012 Page 7 of 15 Functional Description : Input Power Pins IN(+) and IN(-): The input power pins on the PI3106-01-HVIZ are connected to the input power source which can range from 18V to 36V DC. Under surge conditions, the PI3106-01-HVIZ can withstand up to 45V DC for 100 ms without incurring damage. The user should take care to avoid driving the input rails above the specified ratings. Since the PI3106-01-HVIZ is designed with high reliability in mind, the input pins are continuously monitored. If the applied voltage exceeds the input over-voltage trip point (typically 41V) the conversion process shall be terminated immediately. The converter initiates soft-start automatically within 80ms after the input voltage is reduced back to the appropriate value. The input pins do not have reverse polarity protection. If the PI3106 is operated in an environment where reverse polarity is a concern, the user should consider using a polarity protection device such as a suitably rated diode. To avoid the high losses of using a diode, the user should consider the much higher efficiency Picor family of intelligent Cool-ORing ® solutions that can be used in reverse polarity applications. Information is available at picorpower.com. The PI3106-01-HVIZ will draw nearly zero current until the input voltage reaches the internal start up threshold. If the ENABLE pin is not pulled low by external circuitry, the output voltage will begin rising to its final value of 12V about 80ms after the input UV lockout releases. This will occur automatically even if the ENABLE pin is floating. To help keep the source impedance low, the input to the PI3106-01-HVIZ should be bypassed with (2) 4.7uF 50V ceramic capacitors of X7R dielectric in parallel with a low Q 100uF 50V electrolytic capacitor. To reduce EMI and reflected ripple current, a series inductor of 0.2 to 0.47uH can be added. The input traces to the module should be low impedance configured in such a manner as to keep stray inductance minimized. ENABLE Pin: The ENABLE pin serves as a multi-function pin for the PI3106-01-HVIZ. During normal operation, it outputs the on-board 4.9V regulator which can be used for trimming the module up. The ENABLE pin can also be used as a remote enable pin either from the secondary via an optocoupler and some external isolated bias supply or from the primary side through a small signal transistor, FET or any device that sinks 3.3mA, minimum. If the ENABLE pin is lower than 2.35V typical, the converter will be held off or shut down if already operating. A third feature is offered in that during a fault condition such as output OVP, input UV or OV, or output current limit, the ENABLE pin is pulled low internally. This can be used as a signal to the user that a fault has occurred. Whenever the ENABLE pin is pulled low, the TRIM/SS pin follows, resetting the internal and external soft-start circuitry. All faults will pull ENABLE low including over temperature. If increased turn on delay is desired, the ENABLE pin can be bypassed with a small capacitor up to a maximum of 1500pF. TRIM/SS Pin: The TRIM/SS pin serves as another multi-purpose pin. First, it is used as the reference for the internal error amplifier. Connecting a resistor from TRIM/SS to SGND allows the reference to be margined down by as much as -20%. Connecting a resistor from TRIM/SS to ENABLE will allow the reference and output voltage to be margined up by 10%. If the user wishes a longer start up time, a small ceramic capacitor can be added to TRIM/SS to increase it. It is critical to connect any device between TRIM/SS and SGND and not -IN, otherwise high frequency noise will be introduced to the reference and possibly cause erratic operation. TM Pin: The TM pin serves as an output indicator of the internal package temperature which is within approximately +/- 5 K of the hottest junction temperature. Because of this, it is a good indicator of a thermal overload condition. The output is a scaled, buffered analog voltage which indicates the internal temperature in degrees Kelvin. Upon a thermal overload, the TM pin is pulled low, indicating a thermal fault has occurred. Upon restart of the converter, the TM pin reverts back to a buffered monitor. The thermal shutdown function of the PI3106-01-HVIZ is a fault feature which interrupts power processing if a certain maximum temperature is exceeded. TM can be monitored by an external microcontroller or circuit configured as an adaptive fan speed controller so that air flow in the system can be conveniently regulated. SGND Pin: The PI3106-01-HVIZ SGND pin is the “quiet” control circuitry return. It is basically an extension of the internal signal ground. To avoid contamination and potential ground loops, this ground should NOT be connected to -IN since it is already star connected inside the package. Connect signal logic to SGND, not -IN. |
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