STPM098C datasheet(37/110 Pages) STMICROELECTRONICS

37 / 110 page

3.5.1

Loop start/stop sequence

STPM098C loop controllers allow different methods to Start/Stop regulation by properly configuring PMBus™

standard commands:

•

OPERATION

•

ON_OFF_CONFIG

The OPERATION command is used to enable/disable the n-th control loop in conjunction with the VR_ENn pin

and the MFR_VR_EN command.

This command defines also whether the n-th control loop has to work in margin mode (LOW/HIGH) or in NO

margin mode.

•

OPERATION[7:6] = 00, the control loop is directly disabled.

•

OPERATION[5:4] = 00, the control loop is enabled in NO margin mode.

•

OPERATION[5:4] = 01, the control loop is enabled in LOW margin mode.

•

OPERATION[5:4] = 10, the control loop is enabled in HIGH margin mode.

Independently from bit [5:4] configuration, if an output overvoltage or undervoltage fault is detected STPM098C

treats this fault as programmed in the related fault response command.

The ON_OFF_CONFIG command is used to configure the combination of VR_ENn pin input and serial bus

OPERATION and MFR_VR_EN commands needed to enable/disable the n-th control loop.

•

ON_OFF_CONFIG[4:2] = 0xx, the loop is enabled and operates any time bias power is available

regardless of the setting of bits [3:2].

•

ON_OFF_CONFIG[4:2] = 110, the control loop is enabled/disabled only by OPERATION command.

•

ON_OFF_CONFIG[4:2] = 101, the control loop is enabled/disabled only by logic OR between VR_ENn pin

and MFR_VR_EN command.

•

ON_OFF_CONFIG[4:2] = 111, the control loop is enabled when both the OPERATION command AND the

VR_ENn pin ORMFR_VR_EN are commanding the loop to be on. If either an OPERATION command OR

the VR_ENn pin AND MFR_VR_EN commands the control loop to be off.

Note:

For both OPERATION and ON_OFF_CONFIG settings:

•

Any value not listed is an invalid command.

•

Any bit not listed in the table is a don`t care.

The ON_OFF_COMMAND operations can be depicted in the following simplified block diagram:

Figure 28. ON_OFF_CONFIG operation simplified block diagram

OPERATION

ON_OFF_CONFIG

Enable to Loop Controller

0XX

110

101

111

bit<4:2>

VR_EN (Pin)

MFR_VR_EN

INT_RST

STPM098C loop can be configured to separately start each control loop by adjusting the relative delay through a

dedicated PMBus™ command as follows:

TONDELAY=ΔLSB×TONDELAY8:0

(1)

STPM098C

Functional description

DS14440 - Rev 1

page 37/110

STPM098C 数据表(PDF) 37 Page - STMicroelectronics

STPM098C 数据表(HTML) 37 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载