TPS53676 datasheet(37/143 Pages) TI

부품명	TPS53676

상세설명	TPS53676 Dual-Channel D-CAP?? (NM ??7 Phases) Step-Down, Multiphase Controller with AVSBus??and PMBus??Interfaces

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제조업체	TI [Texas Instruments]

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VR_EN

VOUT

TON_DELAY

SRBOOT

Decay based

on load current

tEN_INIT

Figure 7-5. Soft-start and immediate-off (decay)

VR_EN

VOUT

SRBOOT

SROFF

TOFF_DELAY

TON_DELAY

tEN_INIT

Figure 7-6. Soft-start and soft-off

The TON_RISE and TOFF_FALL commands are used to calculate the turn-on and turn-off (in the case of soft-

off) slew rates. While these commands are numerically programmable from 0 to 31.75 ms, only a limited set of

slew rates are supported. During the enable time period, the device calculates the target rising and falling slew

rates according to Equation 1 and Equation 2, then selects the nearest available value from Table 7-4.

SRBOOT = LOOKUP (

VOUT_COMMAND

TON_RISE

)

(1)

SROFF = LOOKUP (

VOUT_COMMAND

TOFF_FALL

)

(2)

Table 7-4. Supported SRBOOT and SROFF slew rates

Supported slew rates (mV/μs)

0.093

0.313

0.097

0.625

0.101

0.938

0.105

1.250

0.111

1.563

0.117

1.875

0.124

2.188

0.131

2.50

0.140

5.00

0.151

10.00

1.163

15.00

0.175

20.00

0.192

25.00

0.213

30.00

0.238

35.00

0.265

40.00

Example: VOUT_COMMAND = 0.88 V, TON_RISE = 1.0 ms

The target slew rate is calculated as SRBOOT = LOOKUP(880 mV/1000 μs) = 0.88 mV/μs. The nearest supported

value of 0.9375 mV/μs is selected.

The expected rise time is approximately (880 mV / 0.9375 mV/μs) ≈ 940 μs.

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TPS53676

SLUSDP0 – DECEMBER 2020

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