TPS65400_15 Datasheet, PDF (61/76 Pages) Texas Instruments – TPS65400 4.5- to 18-V Input Flexible Power Management Unit With PMBus/I2C Interface

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TPS65400
SLVSCQ9B – NOVEMBER 2014 – REVISED SEPTEMBER 2015
9.2.2.1 Design Requirements
Table 44 lists PMBus commands to configure this device.
Table 44. PMBus Commands Used for Current Sharing With Single-Pin Enable⁽¹⁾
COMMAND NAME
PAGE
STORE_DEFAULT_ALL
PIN_CONFIG_00
PIN_CONFIG_01
SEQUENCE_CONFIG
SEQUENCE_ORDER
TON_TOFF_DELAY
CODE
00h
11h
D2h
D3h
D4h
D5h
DDh
NAME
—
—
PGOOD_PIN_CONFIG ⁽¹⁾
ENABLE_PIN_CONFIG
SSPG_PIN_CONFIG ⁽¹⁾
START_PGOOD ⁽¹⁾
START_ORDER
STOP_ORDER
TON_DELAY
TOFF_DELAY
BITS
7:0
—
6:2
1:0
0
0
3:2
1:0
5:3
2:0
COMMENT
Selects output rail
Save settings as default
PGOOD pin and of all PGOOD (manufacturer default)
Single ENABLE
Set to SSx for external soft-start (manufacturer default)
Enable PGOOD dependence (manufacturer default)
Start sequence order
Stop sequence order
Delay time before starting
Delay time before stopping
(1) Only necessary if the defaults have been overwritten since device manufacture.
To achieve the timing requirements shown in Table 44, see the example configuration script in Table 45.
Table 45. Example Configuration Script for Current Sharing With Single-Pin Enable
COMMAND NAME
PAGE
PIN_CONFIG_00
SEQUENCE_CONFIG ⁽¹⁾
PAGE
PIN_CONFIG_01 ⁽¹⁾
SEQUENCE_ORDER
TON_TOFF_DELAY
PAGE
PIN_CONFIG_01 ⁽¹⁾
SEQUENCE_ORDER
TON_TOFF_DELAY
STORE_DEFAULT_ALL
CODE
00h
D2h
D4h
00h
D3h
D5h
DDh
00h
D3h
D5h
DDh
11h
WRITE BYTE
0x04
0x24
0x02
0x00
0x01
0x23
—
COMMENT
Selects all
Single ENABLE
Enable PGOOD dependence (manufacturer default)
Selects SW1 to SW2 pair
Configure SS1/PG1 pin to SS1 for external soft-start
(manufacturer default)
First to start, second to stop
100-ms turn-on delay
100-ms turn-off delay
Selects SW3 to SW4 pair
Configure SS2/PG2 pin to SS2 for external soft-start
(manufacturer default)
Second to start, first to stop
100-ms turn-on delay
25-ms turn-off delay
Save settings as default
(1) Only necessary if the defaults have been overwritten since device manufacture.
9.2.2.2 Detailed Design Procedure
9.2.2.2.1 Current Sharing Timing Example
Figure 43 shows an example configuration in which both the SW1-SW2 pair and SW3-SW4 pair are current
shared. The enable pin of the slave converter can either follow the master converter or be floating. For the
PGOOD pin, the slave PGOOD follows the master PGOOD. Due to internal pull-ups to VDDD on ENSWx lines,
the user has an option to control ENSWx if an always on condition is desired.
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