L9945 datasheet(28/151 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test condition

Min. Typ. Max. Unit

Ipeak

Minimum peak current capability VPS > 7.5V

Tested at VPS > 7.5 V and output shorted to

GND

CLOAD

Equivalent capacitive load to be driven

0.1

td_OFF

Turn ON/OFF delay

50% NONx to 50% OFF gate current

test condition: 0.1 nF

checked for LS/HS config (switch)

1.5

μs

td_ON

Turn OFF/ON delay

50% NONx to 50% ON gate current

test condition: 0.1 nF checked for LS/HS config

(switch)

1.5

μs

ICR_CON

Pre-driver Cross conduction current

guaranteed by design

ILEAK_Gx

GNSPx leakage current in tristate

GNSP-SNGP voltage requirements < 20 V in

case of external P-channel (Gate to SNGPx)

-10

µA

IDRNx

DRNx input leakage current

POR or NRES active; V_DRNx = 0 V to 28 V

-10

µA

ILEAK_S

SNGPx input leakage current

POR or NRES active or Normal mode;

V_SNGPx = 0 V to 28 V

-10

µA

VGNSP-VSNGP

GNSP to SNGP voltage when OFF gate current

is on

100

5.5

H-Bridge

The pre-drivers can be configured into two independent H-Bridges. In this configuration Channels 1-4 are used for

H-Bridge 1, while Channels 5-8 are used for H-bridge 2.

The AN5311 "L9945 in H-Bridge configuration" covers all the main aspects of H-Bridge configuration.

The device can handle up to two H-bridge. There are two possible configurations which can co-exist:

•

H-Bridge 1: it involves channels 1 (HS), 2 (HS), 3 (LS) and 4 (LS) and can be activated by setting

HB1_config = 1

•

H-Bridge 2: it involves channels 5 (HS), 6 (HS), 7 (LS) and 8 (LS) and can be activated by setting

HB2_config = 1

Configurations above are automatically applied once the HBx_config bit is set.

The N_P_config_xx bit set the MOSFET type (NMOS, PMOS) used in the H-bridge high-side. For H-bridge 2,

EN6 must be set high to enable channel 6.

5.5.1

H-Bridge driving modes

The H-Bridge must be controlled via the external NONx pins. Such inputs have different meanings while in H-

Bridge mode:

Table 16. NONx signals in H-bridge configuration

HB1

HB2

Signal description

NON1

NON5

NPWM – Negative asserted Pulse Width Modulation signal

NON2

NON6

DIR – Direction signal

NON3

NON7

HiZ – High Impedance (all FETs actively switched off, load floating)

NON4

NON8

Not used

Any attempt to control channels via SPI is ignored while H-Bridge mode is active.

In driving mode the H-bridge work according to the following table:

L9945

H-Bridge

DS12275 - Rev 8

page 28/151

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