l99dz80ep STMicroelectronics, l99dz80ep Datasheet - Page 38

• Manufacturer Part Number: l99dz80ep
• Description: Door Actuator Driver
• Manufacturer: STMicroelectronics

Application information
Figure 14. H-bridge GSHx slope
3.17
3.18
38/68
Resistive low
The resistive output mode protects the L99DZ80EP and the H-bridge in the standby mode
and in some failure modes (thermal shut down (TSD), charge pump low (CP_LOW) and
stuck-at-‘1’ at pin DI). When a gate driver changes into the resistive output mode due to a
failure a sequence is started. In this sequence the concerning driver is switched into sink
condition for 32 µs to 64 µs to ensure a fast switch-off of the H-bridge transistor. If slew rate
control is enabled, the sink condition is slew-rate controlled. Afterwards the driver is
switched into the resistive output mode (resistive path to source).
Short circuit detection/drain source monitoring
The drain source voltage of each activated external MOSFET of the H-bridge is monitored
by comparators to detect shorts to ground or battery. If the voltage-drop over the external
MOSFET exceeds the threshold voltage V
time t
corresponding drain source monitoring flag (DS_MON[3:0]) is set. The DS_MON bits have
SCd
the corresponding gate driver switches the external MOSFET off and the
Doc ID 18260 Rev 4
SCd
for longer than the short current detection
L99DZ80EP