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參數(shù)資料
| 型號： | L9950TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DOOR ACTUATOR DRIVER |
| 中文描述： | 門執(zhí)行器驅(qū)動(dòng) |
| 文件頁數(shù)： | 3/23頁 |
| 文件大小： | 231K |
| 代理商： | L9950TR |
3/23
L9950
3.7
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
dOL
) the corresponding 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.
Open Load Detection
3.8
In case of an over-current condition a flag is set in the status register in the same way as open load de-
tection. If the over-current signal is valid for at least t
ISC
= 32 μs, the over-current flag is set and the cor-
responding 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.
Over Load Detection
3.9
The current monitor output sources a current image at the current monitor output which has a fixed ratio
(1/10000) of the instantaneous current of the selected highside driver. The bits 18 and 19 of the Input Data
Register 0 control which of the outputs OUT1, OUT4, OUT5, OUT6 and OUT11 will be multiplexed to the
current monitor output. The current monitor output allows a more precise analysis of the actual state of the
load rather than the detection of an open- or overload condition. For example this can be used to detect
the motor state (starting, free-running, stalled). Moreover, it is possible to regulate the power of the de-
froster more precise by measuring the load current. The current monitor output is bidirectional (c.f. PWM
inputs).
Current monitor
3.10
Each driver has a corresponding PWM enable bit which can be programmed by the SPI interface. If the
PWM enable bit is set, the output is controlled by the logically AND-combination of the PWM signal and
the output control bit in Input Data Register. The outputs OUT1-OUT8 and OUT11 are controlled by the
PWM1 input and the outputs OUT9/10 are controlled by the bidirectional input CM/PMW2. For example,
the two PWM inputs can be used to dim two lamps independently by external PWM signals.
PWM inputs
3.11
The six half-brides of the device are cross-current protected by an internal delay time. If one driver (LS or
HS) is turned-off the activation of the other driver of the same half bridge will be automatically delayed by
the cross-current protection time. After the cross-current protection time is expired the slew-rate limited
switch-off phase of the driver will be changed to a fast turn-off phase and the opposite driver is turned-on
with slew-rate limitation. Due to this behaviour it is always guaranteed that the previously activated driver
is totally turned-off before the opposite driver will start to conduct.
Cross-current protection
3.12
Loads with start-up currents higher than the over-current limits (e.g. inrush current of lamps, start current
of motors and cold resistance of heaters) can be driven by using the programmable softstart function (i.e.
overcurrent recovery mode). Each driver has a corresponding over-current recovery bit. If this bit is set,
the device will automatically switch-on the outputs again after a programmable recovery time. The duty
cycle in over-current condition can be programmed by the SPI interface to be about 12% or 25%. The
PWM modulated current will provide sufficient average current to power up the load (e.g. heat up the bulb)
until the load reaches operating condition.
The device itself cannot distinguish between a real overload and a non linear load like a light bulb. A real
overload condition can only be qualified by time. As an example the microcontroller can switch on light
bulbs by setting the over-current Recovery bit for the first 50ms. After clearing the recovery bit the output
will be automatically disabled if the overload condition still exits
Programmable Softstart Function to drive loads with higher inrush currrent
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| L9951 | DOOR ACTUATOR DRIVER |
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| L9997ND013TR | DUAL HALF BRIDGE DRIVER |
| LCDP1511D | DUAL LINE PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| LCDP1521 | DUAL LINE PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9950XP | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 DOOR ACTUATOR DRIVER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L9950XPTR | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 DOOR ACTUATOR DRIVER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L9951 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 REAR DOOR ACTUATOR DRIVER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L9951_10 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Rear door actuator driver |
| L-995-12 | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:NylaKrimp? Funnel Entry Ring Tongue Terminal for 4/0 AWG Wire, Stud #12 |
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