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TPS658620ZQZT датащи(PDF) 61 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 61 Page - Texas Instruments |
61 / 104 page 3.55.5 OUTPUT DISCHARGE SWITCHES 3.55.6 DYNAMIC VOLTAGE POSITIONING TPS658620 Advanced Power Management Unit www.ti.com SLVS993 – OCTOBER 2009 Table 3-30. SM0,SM1, SM2 PWM/PFM Mode Selection SMODE1 [Addr 0x47] Default to 0 Bit Number B7 B6 B5 B4 B3 B2 B1 B0 Bit Name RSVD477 SM2_GPIO SM1_GPIO SM0_GPIO RSVD473 SM2_PWM SM1_PWM SM0_PWM Function SPARE SM2 AUTO SM1 AUTO SM0 AUTO SPARE SM2 PWM SM1 PWM SM0 PWM PFM PFM PFM MODE ON MODE ON MODE ON CONTROL CONTROL CONTROL SELECTION SELECTION SELECTION Table 3-31 details how the GPIO control is implemented. Note that the GPIO1 polarity indicated in Table 3-31 is controlled by bit GPIOINV, register 0x5E. Table 3-31. GPIO1 PWM/PFM Mode Control SMx_GPIO SMx_PWM GPIO1 POLARITY GPIO1 CONVERTER MODE 0 0 x x Auto PWM/PFM 0 1 x x PWM Only 1 x Inverted 0 PWM Only 1 x Inverted 1 Auto PWM/PFM 1 x Not Inverted 0 Auto PWM/PFM 1 x Not Inverted 1 PWM Only When the SM0, SM1 and SM2 converters are disabled, an integrated switch automatically discharges the converter output capacitor. The converter output discharge switches are always enabled when NORMAL state is set and during the SUPPLYSEQ state. This feature reduces the voltage under/overshoots at load steps from light to heavy load and vice versa. It provides more headroom for both the voltage drop at a load step and the voltage increase at a load throw-off. This improves load transient behavior. At light loads, in which the converter operate in PFM Mode, the output voltage is regulated typically 1% higher than the nominal value. In case of a load transient from light load to heavy load, the output voltage will drop until it reaches the COMP LOW threshold set to 2% below the nominal value and enters PWM mode. During a load throw off from heavy load to light load, the voltage overshoot is also minimized due to active regulation turning on the low-side channel switch. Submit Documentation Feedback DETAILED DESCRIPTION 61 |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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