LM5145 datasheet(24/70 Pages) TI

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Table 8-2. Configuration Modes

RCNFG

PRIMARY/

SECONDARY

SPREAD SPECTRUM

DUAL PHASE

29.9 kΩ

Primary

OFF

Disabled

41.2 kΩ

Primary

Disabled

54.9 kΩ

Primary

OFF

Enabled

71.5 kΩ

Primary

Enabled

90.9 kΩ

Secondary

N/A

Enabled

EN / SYNC

VCC

CONFIG_START

CONFIG_DONE

VDDUV

50 µs

SS(internal)

CONFIGURATION TIME

Figure 8-6. Configuration Timing

8.3.16 Single-Output Dual-Phase Operation

To configure for dual-phase operation, two LM5148 controllers are required. The LM5148 can only be configured

in a single or dual-phase configuration where both outputs are tied together. Additional phases cannot be added.

Refer to Figure 8-7. Configure the first controller (CNTRL1) as a primary controller and the second controller

(CNTRL2) as a secondary. To configure CNTRL1 as a primary controller, install a 54-kΩ or a 71.5-kΩ resistor

from CNFG to AGND. To configure the CNTRL2 as a secondary controller, install a 90.9-kΩ resistor from CNFG

to AGND. This disables the error amplifier of CNTRL2, placing it into a high-impedance state. Connect the

EXTCOMP pins of the primary and secondary controllers together. The internal compensation amplifier feature is

not supported when the controller is in dual-phase mode.

In dual-phase mode, the PG/SYNC pin of the primary controller becomes a SYNCOUT. Refer to Section 7.5

for voltage levels. Connect PG of the primary to PFM/SYNC (SYNCIN) of the secondary controller. The PG/

SYNCOUT signal of the primary controller is 180° out-of-phase and facilitates interleaved operation. RT is

not used for the oscillator when the LM5148 is in Secondary Controller mode, but instead is used for slope

compensation. Therefore, select the RT resistance to be the same as that of the primary controller. The oscillator

is derived from the primary controller. When in primary/secondary mode, enable both controllers simultaneously

for start-up. After the regulator has started, pull the secondary EN pin low (< 0.8 V) for phase shedding if needed

at light load to increase the efficiency.

LM5148

SNVSC01 – FEBRUARY 2023

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