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LP87702 数据表(PDF) 24 Page - Texas Instruments |
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LP87702 数据表(HTML) 24 Page - Texas Instruments |
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24 / 98 page  Time Voltage Ramp for Buck BUCKx_CTRL2(BUCKx_SLEW_RATE[2:0]) BUCKx_VSET INT_BUCK(BUCKx_PG_INT) nINT Host clears interrupt Powergood interrupt Powergood BUCK_STATUS(BUCKx_STAT) 1 Powergood BUCK_STATUS(BUCKx_PG_STAT) Host clears interrupt Powergood interrupt 1 0 1 0 1 0 1 0 1 0 BUCK_MASK(BUCKx_PGF_MASK)=0 BUCK_MASK(BUCKx_PGR_MASK)=0 Figure 7-6. Buck Output Voltage Change 7.3.7 Enable and Disable Sequences The LP87702 device supports programmable start-up and shutdown sequencing. An enable control signal is used to initiate the start-up sequence and to turn off the device according to the programmed shutdown sequence. Up to three enable inputs are available: EN1 is a dedicated enable input; EN2 and EN3 are multiplexed with I2C interface. The buck converter is selected for sequence control with: • BUCKx_CTRL_1(BUCKx_EN) = 1 • BUCKx_CTRL_1(BUCKx_EN_PIN_CTRL) = 0x1 or 0x2 or 0x3, for EN1 or EN2 or EN3 control, respectively • BUCKx_VOUT.(BUCKx_VSET[7:0]) = Required voltage when EN pin is high • The delay from rising edge of EN pin to the converter enable is set by BUCKx_DELAY(BUCKx_STARTUP_DELAY[3:0]) bits and • The delay from falling edge of EN pin to the converter disable is set by BUCKx_DELAY(BUCKx_SHUTDOWN_DELAY[3:0]) In the same way the boost converter is selected for delayed control with: • BOOST_CTRL(BOOST_EN) = 1 • BOOST_CTRL(BOOST_EN_PIN_CTRL) = 0x1 or 0x2 or 0x3, for EN1. EN2, or EN3 control (respectively) • BOOST_CTRL(BOOST_VSET[2:0]) = Required voltage when EN pin is high • The delay from rising edge of EN pin to the converter enable is set by BOOST_DELAY(BOOST_STARTUP_DELAY[3:0]) bits and • The delay from falling edge of EN pin to the converter disable is set by BOOST_DELAY(BOOST_SHUTDOWN_DELAY[3:0]) LP87702 SNVSBU3 – MARCH 2021 www.ti.com 24 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: LP87702 |
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