Maxim-integrated MAX15301 PMBus Command Set Uživatelský manuál stáhnout pdf (Strana 52)

MAX15301 PMBus Command Set User’s Guide

Rev 1 Page 52 of 53

DEADTIME_GCTRL

255

-1200

Note: the default setting is LXDAC = 15 and this value should not be changed.

Variable Gate-Drive Voltage

The MAX15301 allows adjustment of the gate drive voltage from approximately 5.2V to 8.7V, as

controlled by a 4-bit DAC. The DAC value to gate-drive voltage relationship is as follows:

GCTRLDAC

Setting

Typical

Gate Drive (V)

5.2

5.4

5.7

5.9

6.1

6.4

6.6

6.8

7.1

7.3

7.5

7.8

8.2

8.5

8.7

The variable gate drive system has two modes of operation, controlled by bit 6 of the LOOP_CONFIG

command. When bit 6 is set to 1, the value of READ_IOUT is compared to determine which of “eighth”

of the full load current range the device is operating in; e.g. 0 to IMAX/8, IMAX/8 to IMAX/4, etc. For

each “bin” of the full load current range, there is a corresponding DAC setting in a lookup table. This

table is populated by values sent in the GCTRL[0] to GCTRL[7] arguments of DEADTIME_GCTRL.

When bit 6 of LOOP_CONFIG is set to 0, the MAX15301 uses one setting for the gate-drive voltage,

regardless of load current. This “fixed” setting is given by the GCTRLDAC argument of DEADTIME_GCTRL.

Wait at least 500ms for execution after sending the DEADTIME_GCTRL command before sending

additional PMBus commands.

ZETA_P

Reference:

Maxim Specific

Lockable:

Yes

Command Code:

0xE8

Format:

Linear

Data Bytes:

Units:

Scalar

Transfer:

Read/Write Byte

Factory Value:

0xBB00 (1.5)

Description/Notes:

The ZETA_P command sets the damping ratio for the closed-loop response. The value can be changed

to improve performance when using nonceramic output capacitors with higher equivalent series

resistance.

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