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PI3546-00-LGIZ Datasheet(PDF) 24 Page - Vicor Corporation |
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PI3546-00-LGIZ Datasheet(HTML) 24 Page - Vicor Corporation |
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24 / 37 page  Cool-Power® Rev 1.3 vicorpower.com Page 24 of 37 2/2016 800 927.9474 PI354x-00 Functional Description The PI354x-00 is a family of highly integrated ZVS-Buck regulators. The PI354x-00 has an output voltage that can be set within a prescribed range shown in Table 1. Performance and maximum output current are characterized with a specific external power inductor (see Table 2). For basic operation, Figure 49 shows the connections and components required. No additional design or settings are required. ENABLE (EN) EN is the enable pin of the converter. The EN Pin is referenced to SGND and permits the user to turn the regulator on or off. The EN default polarity is a positive logic assertion. If the EN pin is left floating or asserted high, the converter output is enabled. Pulling EN pin below 0.8 Vdc with respect to SGND will disable the regulator output. Remote Sensing If remote sensing is required, the PI354x-00 product family is equipped with an undedicated differential amplifier. This amplifier can allow full differential remote sense by configuring it as a differential follower and connecting the VDIFF pin to the EAIN pin. Switching Frequency Synchronization The SYNCI input allows the user to synchronize the controller switching frequency by an external clock referenced to SGND. The external clock can synchronize the unit between 50% and 110% of the preset switching frequency (fS). The PI354x-00 syncs to the falling edge of the applied clock, providing 180 degrees of phase shift with respect to SYNCO. This allows for the interleaved paralleling of two PI354x-00 devices. The SYNCI pin should be connected to SGND through a zero Ohm resistor when not in use and should never be left floating. When using the internal oscillator, the SYNCO pin provides a 5 V clock that can be used to sync other regulators. Therefore, one PI354x-00 can act as the lead regulator and have additional PI354x-00s running in parallel and synchronized. Soft-Start The PI354x-00 includes an internal soft-start capacitor to control the rate of rise of the output voltage. See the Electrical Characteristics Section for the default value. Connecting an external capacitor from the TRK pin to SGND will increase the start-up ramp period. See, “Soft Start Adjustment and Track,” in the Applications Description section for more details. Output Voltage Selection The PI354x-00 output voltage can be selected by connecting a resistor from EAIN pin to SGND and a resistor from Vout to the EAIN pin as shown in Figure 49. Table 1 defines the allowable operational voltage ranges for the PI354x-00 family. Output Current Limit Protection PI354x-00 has two methods implemented to protect from output short or over current condition. Slow Current Limit protection: prevents the output from sourcing current higher than the regulator’s maximum rated current. If the output current exceeds the Current Limit (IOUT_CL) for 1024 μs, a slow current limit fault is initiated and the regulator is shutdown which eliminates output current flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle is initiated. This restart cycle will be repeated indefinitely until the excessive load is removed. Fast Current Limit protection: PI354x-00 monitors the regulator inductor current pulse-by-pulse to prevent the output from supplying very high current due to sudden low impedance short. If the regulator senses a high inductor current pulse, it will initiate a fault and stop switching until Fault Restart Delay ends and then initiate a soft-start cycle. Input Undervoltage Lockout If VIN falls below the input Under Voltage Lockout (UVLO) threshold, but remains high enough to power the internal bias supply, the PI354x-00 will complete the current cycle and stop switching. The system will soft start once the input voltage is reestablished and after the Fault Restart Delay. Input Overvoltage Lockout If VIN exceeds the input Over Voltage Lockout (OVLO) threshold (VOVLO), while the controller is running, the PI354x-00 will complete the current cycle and stop switching. The system will soft start once the input voltage is reestablished and after the Fault Restart Delay. Figure 49 — ZVS-Buck with required components Vin Vout Cin Cout L1 VOUT VS1 LGH TRK EAIN EAO COMP VSN VSP VDIFF PI354X EN VIN SYNCI PGND SYNCO PWRGD TESTx VDR SGND Table 1 — PI354x-00 family output voltage ranges Device Output Voltage Nom. Range PI3542-00-LGIZ 2.5 V 2.2 V to 3.0 V PI3543-00-LGIZ 3.3 V 2.6 V to 3.6 V PI3545-00-LGIZ 5.0 V 4.0 V to 5.5 V PI3546-00-LGIZ 12 V 6.5 V to 14.0 V |
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