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L6788A Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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L6788A Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 18 page Pins description and connection diagram L6788A 6/18 Doc ID 15341 Rev 2 6 VR_HOT/ EN Voltage regulator HOT / enable pin. Internally pulled up by 10 µA (typ) to 3.3 V. Multifunction pin to enable/disable the system (input-signal) and to provide the information about the warning temperature (output-signal). Forced low, the device stops operations with all MOSFETs OFF: all the latched protections are disabled. Removing the short on VR_HOT/EN pin, the device starts-up implementing soft-start and the voltage at the pin is clamped by the device at 1.5 V (typ). When a warning temperature is detected the device leaves the pin floating. Thermal monitoring enabled if Vcc > UVLOVCC (See “thermal monitoring” section for details). VR_HOT/EN pin is set free when: • Either TCS pin voltage overcomes the warning threshold voltage (see TCS pin for details). • Or Tj_IC Die temperature overcomes the die warning temperature (T_HOT) Where T_HOT=T_Shutdown-T_Delta Use a pull-up resistor in the range of 10 k Ω−30 kΩ when VR_HOT/EN pin is directly pulled up to 3.3 V. (see VR_HOT/EN pin voltage Electrical Characteristic table). Cycle this pin to recover latch from protections. 7 VID1 Voltage identification pins. Internally pulled low by 10 µA. They allow programming output voltage from the 4-level “power play table” in PVID mode. 8VID0 9IREF Current reference pin. Internally fixed at 1.240 V, connecting a RIREF = 12.4 k Ω (+/-0.1%) resistor vs. AGND allows setting 100 µA current that is mirrored into R1, R2, R3 pins in order to program the three power play table levels voltage. See “power play table level” section for details. 10 R3 Default “power play table” voltage setting pins. The device sources from each Rx pin the same constant current sourced from the IREF pin ( Internally mirrored). As a consequence the Voltage between Rx pin and AGND is given by the following relationship: VRx= IREF * Rx=100 µA*Rx, where IREF is the current programmed on IREF pin (100 µA). As soon as the ENABLE is released the device reads the Rx pin voltage and it stores these value. As a consequence if the power play table is re-written by serial BUS the analog values can not be recovered (voltage fixed by Rx resistor). See “power play table level” section for details. 11 R2 12 R1 13 CS1- Channel 1 current sense negative input. Connect through a Rg resistor to the output-side of the channel 1 inductor. 14 CS1+ Channel 1 current sense positive input. Connect through an R-C filter to the phase-side of the channel 1 inductor. 15 CS2- Channel 2 current sense negative input. Connect through a Rg resistor to the output-side of the channel 2 inductor. Still connect to VOUT through Rg resistor when using 1-phase operation. Table 2. Pin description (continued) Pin n° Name Description |
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