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TPS62353YZGT Datasheet(PDF) 29 Page - Texas Instruments |
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TPS62353YZGT Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 46 page  www.ti.com TPS62350, TPS62351 TPS62352, TPS62353, TPS62354 SLVS540B – MAY 2006 – REVISED DECEMBER 2006 In multiple-step mode, PWROK is defined as low while the output voltage is ramping up or down. Under all other operating conditions, PWROK is defined to be low when the output voltage is below -1.5% of the target value. Voltage Ramp Control The TPS6235x offers a voltage ramp rate control that can operate in two different modes: • Multiple-Step Mode • Single-Step Mode The mode is selected via DEFSLEW control bits in the CONTROL2 register. Single-Step Voltage Scaling Mode (default), DEFSLEW[2:0] = [111] In single-step mode, the TPS6235x ramps the output voltage with maximum slew-rate when transitioning between the floor and the roof voltages (switch to a higher voltage). When switching between the roof and the floor voltages (transition to a lower voltage), the ramp rate control is dependent on the mode selection (see CONTROL1 register) associated with the target register (Forced PWM, Fast, or Light PFM). Table 3 shows the ramp rate control when transitioning to a lower voltage with DEFSLEW set to immediate transition. Table 3. Ramp Rate Control vs. Target Mode Mode Associated with HW_nSW Output Voltage Ramp Rate Target Voltage Forced PWM X Immediate Fast PFM X Time to ramp down depends on output capacitance and load current Light PFM X Time to ramp down depends on output capacitance and load current For instance, when the output is programmed to transition to a lower voltage with Light or Fast PFM operation enabled, the TPS6235x ramps down the output voltage without controlling the ramp rate or having intermediate micro-steps. The required time to ramp down the voltage depends on the capacitance present at the output of the TPS6235x and on the load current. From an overall system perspective, this is the most efficient way to perform dynamic voltage scaling. Multiple-Step Voltage Scaling Mode, DEFSLEW[2:0] = [000] to [110] In multiple-step mode the TPS6235x controls the output voltage ramp rate regardless of the HW_nSW bit and of the mode of operation (e.g. Forced PWM, Fast PFM, or Light PFM). The voltage ramp control is done by adjusting the time between the voltage micro-steps. 29 Submit Documentation Feedback |
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