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LP87702 数据表(PDF) 21 Page - Texas Instruments |
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LP87702 数据表(HTML) 21 Page - Texas Instruments |
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21 / 98 page  Table 7-3. Converter Control BUCKx_EN / BOOST_EN BUCKx_EN_PIN_C TRL / BOOST_EN_PIN_C TRL EN1 PIN EN2 PIN EN3 PIN BUCKx OUTPUT VOLTAGE / BOOST OUTPUT VOLTAGE Enable or disable control with BUCKx_EN/ BOOST_EN bit 0 Don't Care Don't Care Don't Care Don't Care Disabled 1 00 Don't Care Don't Care Don't Care BUCKx_VSET[7:0] / BOOST_VSET[1:0] Enable or disable control with EN1 pin 1 01 Low Don't Care Don't Care Disabled 1 01 High Don't Care Don't Care BUCKx_VSET[7:0] / BOOST_VSET[1:0] Enable/disable control with EN2 pin 1 10 Don't Care Low Don't Care Disabled 1 10 Don't Care High Don't Care BUCKx_VSET[7:0] / BOOST_VSET[1:0] Enable or disable control with EN3 pin 1 11 Don't Care Don't Care Low Disabled 1 11 Don't Care Don't Care High BUCKx_VSET[7:0] / BOOST_VSET[1:0] Figure 7-4 shows how the BUCKx converter is enabled by an ENx pin or by I2C write access. The soft-start circuit limits the in-rush current during start-up. The output voltage increase rate is typically 30 mV/μsec during soft start. The output voltage becomes slew-rate controlled when the output voltage rises to 0.35-V level. If there is a short circuit at the output and the output voltage does not increase above a 0.35-V level in 1 ms, the converter is disabled, and interrupt is set. When the output voltage rises above the undervoltage power-good threshold level the BUCKx_PG_INT interrupt flag in the INT_BUCK register is set. Power-good thresholds are defined by BUCKx_WINDOW bits. A PGOOD_WINDOW bit in PGOOD_CTRL register sets the detection method for the valid buck output voltage, either undervoltage detection or undervoltage and overvoltage detection. The powergood interrupt flag can be masked using the BUCKx_PGR_MASK bit in the BUCK_MASK register when reaching the valid output voltage. The power- good interrupt flag can also be generated when the output voltage becomes invalid. The interrupt mask for invalid output voltage detection is set by BUCKx_PGF_MASK bit in BUCK_MASK register. When the window monitoring (under and overvoltage monitoring) is selected, the mask bits apply when voltage is crossing either threshold. A BUCKx_PG_STAT bit in BUCK_STAT register shows always the validity of the output voltage; '1' means valid, and '0' means invalid output voltage. www.ti.com LP87702 SNVSBU3 – MARCH 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 21 Product Folder Links: LP87702 |
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