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Comp_model, Deadtime_gctrl, Test_mode – Maxim Integrated MAX15301 PMBus Command Set User Manual

Page 50

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MAX15301 PMBus Command Set User’s Guide

Rev 1

Page 50 of 53

COMP_MODEL

Reference:

Maxim Specific

Lockable:

Yes

Command Code:

0xDB

Format:

Linear

Data Bytes:

6 (see Description)

Units:

Scalar

Transfer:

Read/Write Block

Factory Value:

0.03167, 0.5, 0.5

Description/Notes: The COMP_MODEL command provides access to key control loop tuning parameters. The three

arguments are as follows:

Data Byte

Number

Data Byte

Name

Units

Description

0

F

LC

/F

SW

None

Power stage LC double-pole frequency, as a fraction of the
PWM fundamental frequency. In typical operation, this
parameter is determined by parametric extraction.

1

F

Z

/F

SW

None

Output capacitor ESR zero frequency, as a fraction of the PWM
fundamental frequency.

2

Z

LC

None

Power stage damping factor. Higher values indicate a more
damped LC filter; lower values represent a less damped filter.

The values of COMP_MODEL can be altered by the parametric extraction function of the MAX15301.
They will reset to the USER store values whenever the output is disabled, unless bit 3 of

ADAPTIVE_MODE

is cleared.

Note that the values in COMP_MODEL are not saved during a

STORE_USER_ALL

or

STORE_DEFAULT_ALL

operation, unless the values have previously been set by a PMBus write to

COMP_MODEL, as indicated by bit 14 of

STRAP_DISABLE

. This safety feature prevents inadvertent

storage of parametric extraction results that could adversely affect the initial ramp control loop tuning.

Wait at least 500μs for execution after sending the COMP_MODEL command before sending additional
PMBus commands.

DEADTIME_GCTRL

Reference:

Maxim Specific

Lockable:

Yes

Command Code:

0xE7

Format:

See Description

Data Bytes:

19

Units:

N/A

Transfer:

Read/Write Block

Factory Value:

See Description

Description/Notes: The DEADTIME_GCTRL command allows configuration of the Adaptive Gate-Drive timing system (AGD),

adjustment of static gate-drive timing, and adjustment of the variable gate-drive voltage system. The
arguments for this command are as follows:

Byte

#

Data Name

Data
Type

Description

Default

Value

0

fixedDTR (LSB)

Signed

Integer

Static rising-edge deadtime adjustment

20

1

fixedDTR (MSB)

2

fixedDTF (LSB)

Signed

Integer

Static falling-edge deadtime adjustment

20

3

fixedDTF (MSB)

4

TDR (LSB)

Signed

Integer

AGD system rising edge deadtime target value

3

5

TDR (MSB)