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PI2211 Datasheet(PDF) 11 Page - Vicor Corporation |
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PI2211 Datasheet(HTML) 11 Page - Vicor Corporation |
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11 / 26 page  Picor Corporation · picorpower.com PI2211 Rev 1.1, Page 11 of 26 PI2211 SOA Thermal Cycling: The PI2211 continuously monitors the power dissipation in the MOSFET by measuring the voltage drop across the MOSFET (VDS) and the calculated current through the sense resistor (IDRAIN). As previously described the power information is processed through two equivalent internal networks whose individual responses emulate the MOSFET RJ-C and RC-A thermal characteristics. These two responses are summed together to create an accurate RJ-A thermal response. When the computed junction temperature rise in the MOSFET is 60°C, the MOSFET is turned off and, while still being continuously monitored, allowed to cool to a calculated junction temperature rise of 21°C (an estimated drop of 39°C). The MOSFET is once again turned on and monitored. The PI2211 will continue the thermal cycling of the MOSFET 16 times with this temperature hysteresis range before dropping the cool down temperature to 3°C rise. Once at 3°C, the PI2211 will continue the thermal cycling indefinitely with a 57°C temperature hysteresis range resulting in a long cool down period. An example of this SOA thermal cycling is shown below in Figure 5 and in Figure 11. Figure 5 - SOA Thermal Cycling Figure 5 shows the initial string of 16 SOA pulses. The VGS is displayed on Ch1 (blue), the start-up current is shown on Ch3 (purple) and the BUS voltage is shown on Ch4 (green). Power -good is shown on Ch2 (light blue), which is low during SOA. VAUX Supply/Gate Drive: The PI2211 is designed to be used in systems where the BUS voltage range is from 0.9Vdc to 14Vdc. When using a BUS voltage of 4.5Vdc or greater, the PI2211 internal LDO regulator creates a VCC voltage of 4Vdc to bias the IC. When using a BUS of less than 4.5Vdc, an external supply (VAUX) is required to drive VCC; typically 5Vdc or greater with a series current limiting resistor (RAUX), as is shown in Figure 6, to protect the internal clamp of the VCC pin. The RAUX limiting resistor is calculated as: RAUX = (VAUX - 3.8V)/10mA. Though the BUS pin is not used to generate VCC, it still must be connected to the BUS supply for proper operation. Figure 6 - External VAUX connection for lower BUS voltages. The PI2211 has an internal charge pump that requires no external components and is designed to be used with MOSFET that can operate with a gate drive of 4.5Vdc. Figure 7 - Enable, UV and OV thresholds. |
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