Maxim Integrated MAX15303 PMBus Command Set - Manual (Page 49)

MAX15303 PMBus Command Set User’s Guide
Page 49 of 52
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: 0.025, 0.41666, 1.0
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 MAX15303.
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 and adjustment of static gate-drive timing. 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, given in
nanoseconds
20
1 fixedDTR (MSB)
2 fixedDTF (LSB) Signed
Integer
Static falling-edge deadtime adjustment, given
in nanoseconds
20
3 fixedDTF (MSB)
4 TDR (LSB) Signed
Integer
AGD system rising edge deadtime target value
(AGD system disabled, do not alter this value)
3
5 TDR (MSB)
6 TDF (LSB) Signed AGD system falling edge deadtime target value 8