L9950 STMicroelectronics, L9950 Datasheet - Page 21

• Manufacturer Part Number: L9950
• Description: IC DRIVER DOOR ACTUATOR PWRSO-36
• Manufacturer: STMicroelectronics
• Type: Door Actuator Driverr

Specifications of L9950

• Applications: Automotive
• 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

L9950 - L9950XP
3.5
3.6
3.7
3.8
Overvoltage and under voltage detection
If the power supply voltage V
21 V), the outputs OUT1 to OUT11 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.
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. In order to reactivate the output stages the junction temperature must
decrease below T
microcontroller.
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
j SD
recovers to normal operating voltage the outputs stages return to the
S
drops below the under voltage threshold V
- T
j SD HYS
S
Doc ID 10311 Rev 10
rises above the overvoltage threshold V
and the thermal shutdown bit has to be cleared by the
j TW
a temperature warning flag is set and is detectable
SUV OFF
ISC
Application information
dOL
= 32 µs, the over-
SOV OFF
) the corresponding
(UV switch OFF
j SD
, the thermal
(typical
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