L9953 STMicroelectronics, L9953 Datasheet - Page 20

• Manufacturer Part Number: L9953
• Description: IC DVR DOOR ACTUATOR POWERSO-36
• Manufacturer: STMicroelectronics

Specifications of L9953

• Applications: Door Actuator
• Current - Supply: 7mA
• Voltage - Supply: 7 V ~ 28 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-36 Exposed Bottom Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
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Overvoltage and under voltage detection
If the power supply voltage V
V), the outputs OUT1 to OUT8 are switched to high impedance state to protect the load.
When the voltage V
voltage), the output stages are switched to the high impedance to avoid the operation of the
power devices without sufficient gate driving voltage (increased power dissipation). If the
supply voltage V
programmed state (input register 0: bit 20=0).
If the under voltage/overvoltage recovery disable bit is set, the automatic turn-on of the
drivers is deactivated. The microcontroller needs to clear the status bits to reactivate the
drivers. It is recommended to set bit 20 to avoid a possible high current oscillation in case of
a shorted output to GND and low battery voltage.
Charge pump
The charge pump runs under all conditions in normal mode. In standby the charge pump is
disabled.
Temperature warning and thermal shutdown
If junction temperature rises above T
via the SPI. If junction temperature increases above the second threshold T
shutdown bit will be set and power DMOS transistors of all output stages are switched off to
protect the device. Temperature warning flag and thermal shutdown bit are latched and must
be cleared by the microcontroller. The related bit is only cleared if the temperature
decreases below the trigger temperature. If the thermal shutdown bit has been cleared the
output stages are reactivated.
Open load detection
The open load detection monitors the load current in each activated output stage. If the load
current is below the open load detection threshold for at least 1 ms (t
open load bit is set in the status register. Due to mechanical/electrical inertia of typical loads
a short activation of the outputs (e.g. 3ms) can be used to test the open load status without
changing the mechanical/electrical state of the loads.
Over load detection
In case of an over-current condition a flag is set in the status register in the same way as
open load detection. If the over-current signal is valid for at least t
current flag is set and the corresponding driver is switched off to reduce the power
dissipation and to protect the integrated circuit. If the over-current recovery bit of the output
is zero the microcontroller has to clear the status bits to reactivate the corresponding driver.
S
recovers to normal operating voltage the outputs stages return to the
S
drops below the under voltage threshold V
S
Doc ID 14278 Rev 3
rises above the overvoltage threshold V
j TW
a temperature warning flag is set and is detectable
SUV OFF
ISC
dOL
= 32 µs, the over-
SOV OFF
) the corresponding
(UV-switch-OFF
L9953 / L9953XP
j SD
, the thermal
(typical 21