L6751CTR datasheet(20/57 Pages) STMICROELECTRONICS

20 / 57 page

Device configuration and pin-strapping tables

L6751C

20/57

DocID025037 Rev 1

4.2

Programming Hi-Z level

The L6751C is able to manage different levels for Hi-Z on PWMx guaranteeing flexibility in

driving different external drivers as well as DrMOS ICs.

After EN assertion and before soft-start, the device uses PWM1 and PWM2 to detect the

driver/DrMOS connected in order to program the suitable Hi-Z level of PWMx signals. During

regulation, the Hi-Z level is used to force the external MOSFETs in high impedance state.

–

PWM1 sources a constant 10

A current, if its voltage results higher than 2.8 V,

Hi-Z

level used during the regulation is 1.4 V, if lower, PWM2 information is used.

–

PWM2 is kept in Hi-Z, if its voltage results higher than 2 V, Hi-Z level used during

the regulation is 2 V, if lower, 1.6 V.

An external resistor divider can be placed on PWM1 and PWM2 to force the detection of the

correct Hi-Z level. They must be designed considering the external driver/DrMOS selected

and the Hi-Z level requested.

Table 6. Device configuration

SVI address

DROOP (see Table 8)

IMAX / SIMAX

BOOT / TMAX

DPM

VR12

0000b

Enabled.

See Table 8

SeeTable 10

Supported

VR12(1) ()

0010b

0100b

MPhase: as per Table 9.

SPhase: disabled

AMD

n/a

MPhase: enabled. SPhase:

as per Table 9.

Ignored

TMAX(2)

supported

1. In DDR mode, single-phase reference is multi-phase VOUT/2 (JMode disabled).

2. Refer to Table 10 and choose any of the resistor combinations leading to the desired TNMAX. Other settings are ignored.

Table 7. Phase number programming

PHASE #

PWM1 to PWM3

PWM4

PWM5

PWM6

To driver

1 k

 to VCC5

To driver

1 k

 to VCC5

To driver

1 k

 to VCC5

To driver

L6751CTR датащи(PDF) 20 Page - STMicroelectronics

L6751CTR датащи(HTML) 20 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

датащи скачать

ссылки URL