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GRM21BR71E-225KA73L Datasheet(PDF) 2 Page - Vicor Corporation |
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GRM21BR71E-225KA73L Datasheet(HTML) 2 Page - Vicor Corporation |
2 / 14 page UG:301 vicorpower.com Applications Engineering: 800 927.9474 Page 2 Cool-Power® PI31xx Series Product Description The PI31xx operates over a wide range input, delivering 50 W or 60 W output power depending on the individual model number. The PI31xx Series is available in a space saving surface mountable 0.87” x 0.65” x 0.265” Power –System –in – a – Package (PSiP), achieving ~50% space reduction versus alternative solutions. The switching frequency of 900kHz allows for small input and output filter components which further reduces the total size and cost of the overall system solution. The output voltage is sensed and fed back to the internal controller using a proprietary isolated magnetic feedback scheme which allows for high bandwidth and good common mode noise immunity. The PI31xx Series requires no external feedback compensation and offers a total solution with a minimum number of external components. A rich feature set is offered, including + 10%, -20% output voltage trim capability (depending on the model number), remote enable, over-voltage protection, adjustable soft-start, over-current protection with auto-restart to protect against both short circuit and overload and over and under input voltage lockout. A unique temperature monitor and protection circuit is included that provides an analog voltage proportional to the internal die temperature, as well as over temperature shutdown, restart and over temperature fault alarm signal. Board Connections 1. Connect Test Equipment a. Connect the input DC power supply to the target board as shown in Figure 6. The negative terminal should be wired to –IN and the positive terminal should connect to the positive terminal of the DMM wired as a DC Ammeter. Be sure that the proper sized wires are used to allow minimum voltage drop for a maximum input current of up to 4 A. Use ring lugs mated to the included fasteners on the evaluation board. If your input power supply has remote sense capability, it can be wired to the INN and INP test points if desired. Connect the positive terminal of the DMM to the +IN lug on the evaluation board. b. Connect the primary side DMM (for measuring the input voltage) to INN and INP respectively. c. Connect the oscilloscope as shown in Figure 6 if you are planning to measure both primary and secondary signals at the same time. If you do not have an isolated differential amplifier, it is important to note that simultaneous measurement of both primary and secondary referenced signals using an oscilloscope with a grounded chassis is not recommended, as it will short circuit the primary to secondary isolation barrier. Floating the oscilloscope is also not recommended due to the large capacitance introduced by this long standing practice. The best practice is to use an isolated differential amplifier or use an oscilloscope with isolated channels. That is, the input returns are isolated from each other and earth ground. d. Connect the output DC DMM to the test points OUTN and OUTP. These test points are done in a Kelvin type manner so that they have no high current flowing in them. e. Connect the DC Load to the output lugs OUT+ and OUT-. It is critical for this connection to be low inductance. |
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