Maxim-integrated MAX15301 PMBus Command Set Bedienungsanleitung PDF herunterladen (Seite 51)

MAX15301 PMBus Command Set User’s Guide

Rev 1 Page 51 of 53

DEADTIME_GCTRL

6

TDF (LSB)

Signed

Integer

AGD system falling edge deadtime target value 8

7

TDF (MSB)

8 LXDAC

Unsigned

Byte

AGD system body-diode conduction comparator

threshold DAC setting

15

9 GCTRL[0]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 0

0

10 GCTRL[1]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 1

0

11 GCTRL[2]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 2

5

12 GCTRL[3]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 3

5

13 GCTRL[4]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 4

8

14 GCTRL[5]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 5

10

15 GCTRL[6]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 6

12

16 GCTRL[7]

Unsigned

Byte

Variable gate drive voltage DAC lookup table

value, bin 7

15

17

GCTRLDAC (LSB)

Unsigned

Integer

Constant gate drive voltage DAC value 0

18

GCTRLDAC (MSB)

Nonoverlap/Deadtime Adjustment

There are two sets of deadtime adjustment values: the fixedDTR and fixedDTF terms adjust the

nonoverlap

timing when the AGD system is disabled, whereas the TDR and TDF values provide

corresponding target values that are used when the AGD system is enabled.

Note that the AGD system is disabled by default (bit 4 of the LOOP_CONFIG command) and operation of

the AGD system is not recommended or supported by Maxim.

The deadtime adjustment values are given in “vernier tick” units, such that each step results in a

deadtime adjustment as follows:

FREQUENCY_SWITCH ≤ 475kHz: 1 vernier tick = 1 / (FREQUENCY_SWITCH * 2048)

FREQUENCY_SWITCH > 475kHz: 1 vernier tick = 1 / (FREQUENCY_SWITCH * 1024)

Caution must be exercised when trimming the gate-drive nonoverlap timing; it is possible to set negative

values and cause the high-side driver to enable before the low-side driver has disabled, and vice-versa.

Body-Diode Conduction Comparator

The LXDAC term is used to adjust the low-side MOSFET body-diode conduction detection comparator

reference threshold as follows:

LXDAC Setting

Comparator Threshold (mV)

1

-150

3

-300

7

-450

15

-600

31

-750

61

-900

127

-1000

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