L99DZ320 datasheet(76/146 Pages) STMICROELECTRONICS

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Table 55. H-bridge monitoring in off mode

Control bits

Failure bits

Comments

OL H1L2

OL H2L1

H OLTH High

DSMON LS1

DSMON LS2

Drain-source monitor disabled

No open-load detected

Open-load

Short to GND

Short to VS

No open-load detected

Open-load

Short to GND

Short to VS

3.29

Programmable cross current solution

The external Power MOSFETs transistors in H-bridge (two half bridges) configuration are switched on with an

additional delay time tCCP to prevent cross current in the half bridge. The cross current protection time tCCP can

be programmed with the SPI using bits COPT<3:0> (CR12). The timer is started when the gate driver is switched

on in the device.

The PWMH module has 2 timers to configure locking time for high-side and freewheeling low-side.

The programmable time tCCP-TIM1/CCP-TIM2 is the same. Sequence for switching in PWM mode is as follows:

•

HS switches off after locking tCCP-TIM1

•

LS switches on after 2nd locking tCCP-TIM1

•

HS switches on after locking tCCP-TIM2 which starts with rising edge on PWMH input

Figure 38. PWMH cross current protection time implementation

L99DZ320

Functional description

DS14235 - Rev 5

page 76/146

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