ZHCSGZ6A October 2017 – February 2025 TPS6508700
PRODUCTION DATA
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The buck regulators (BUCK1 through BUCK6) support dynamic voltage scaling (DVS) for maximum system efficiency. The VR outputs can slew up and slew down in either 10-mV or 25-mV steps using the 7-bit voltage ID (VID) defined in Section 5.7 and Section 5.8. The DVS slew rate is 2.5 mV/μs (minimum). To meet the minimum slew rate, VID progresses to the next code at 3-μs (nominal) interval per 10-mV or at 6-μs interval per 25-mV steps. When DVS is active, the VR is forced into PWM mode, unless the BUCKx_DECAY bit is 1b, to ensure the output keeps track of the VID code with minimal delay. Additionally, the PGOOD bits (in the PG_STATUS1 and PG_STATUS2 registers) are masked when DVS is in progress. Figure 6-4 shows an example of slew down and slew up from one VID to another (step size of 10 mV).
Figure 6-4 DVS
Timing Diagram I (BUCKx_DECAY = 0b)When DVS is enabled and the BUCKx_VID[6:0] bit is set to any setting except 0b or 1b, the slew rate of the voltage is as shown in Figure 6-4.
As shown in Figure 6-5, if a BUCKx_VID[6:0] bit is set to 0000000b, the output voltage of that buck slews down to 0.5 V first, and then drifts down to 0 V as the SMPS stops switching. Subsequently, if a BUCKx_VID[6:0] bit is set to a value (neither 0000000b nor 0000001b) when the output voltage of that buck is less than 0.5 V, the VR ramps up to 0.5 V first and the soft-start time begins. The output voltage then slews up to the target voltage of the previously mentioned slew rate.
A fixed 200 μs of soft-start time is reserved for the output voltage to reach 0.5 V. In this case, however, the SMPS is not forced into PWM mode as it otherwise could cause the output voltage to droop momentarily if the output voltage might have been drifting above 0.5 V for any reason.
Figure 6-5 DVS
Timing Diagram II (BUCKx_DECAY = 0b)