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| 型号： | A3944KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/31页 |
| 文件大小： | 0K |
| 描述： | IC PREDRIVER MOSFET 6CH TSSOP |
| 标准包装： | 8,000 |
| 配置： | 低端 |
| 输入类型： | 并行/串行 |
| 延迟时间： | 200ns |
| 电流 - 峰： | 50mA |
| 配置数： | 6 |
| 输出数： | 6 |
| 电源电压： | 6 V ~ 40 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
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A3944
Automotive, Low Side FET Pre-Driver
between the drain connection to the FET and the DRNx terminal.
This resistor should be selected such that the energy dissipated by
the clamp diode is less than the absolute maximum drain clamp
energy, E DRN . This is necessary to avoid excessive heat genera-
tion in the silicon; otherwise permanent damage to the chip is
likely. Selecting a value for R Dx is described in the Applications
Information section, below.
On-State Diagnostics: Short to Battery
When a channel is in the on-state the voltage at the drain monitor
terminal, V DRNx , is compared to a threshold level derived from
the voltage at the REF terminal. A short to battery fault is present
if V DRNx is higher than V STB (see figure 3). Note that an open
FET also would be detected as a short to battery.
The threshold voltage, V STB , is selected per channel as a percent-
age of the voltage at the REF terminal. The voltage selection is
determined by the SB0, SB1, and SB2 bits (bits1, 2, and 3 of the
fault configuration register for the channel).
When a FET is switched-on there is a finite time before the drain
voltage reaches a steady state. To avoid false fault detection at
switch-on, the output from the short to battery comparator is
ignored during the on-state fault blank time, t BL(on) , after the
GATx output is commanded to drive high. One of four possible
on-state fault blank times is selected, per channel, through the
TON0 and TON1 bits (bits 4 and 5 of the fault configuration
register for the channel).
To avoid false fault detection during supply transients, when the
FET is active an additional fault filter will mask faults that are
present for less than the on-state fault filter time, t FF(on) . This
fault filter is only active after the fault blank time.
The result is that directly after switch-on, a short to battery fault
will not be detected until t BL(on) after the GATx output is com-
manded to drive high. If a short occurs after t BL(on) from switch-
on, then it must be present for at least t FF(on) before it is detected.
When a short to battery is detected the GATx output is automati-
cally commanded to drive low and to switch-off the FET. Two
alternative modes are then available depending on the status of
the RT0 and RT1 bits (bits 10 and 11 of the fault configuration
register for the channel).
If RT1 is 0, the FET will be held off until the fault is reset by
pulsing RESETN low for longer than t RST or by toggling the
channel off then on, through the serial interface. In this mode,
toggling the input terminal for the channel has no effect until
after a reset.
If RT1 is 1, the channel will be held off until one of the two
common retry timers completes a time-out. The timer selection is
made by the state of the RT0 bit. The channel control bits, both
serial and logic input, are ignored during this time. At the end of
V DRNx
On-State
Diagnostics
Short to Battery
Detected
Off-State
Diagnostics
Normal
Operation
Open Load
Detected
V DRNx
V BB
V OL
V OCL
the retry time-out the channel will be switched-on again if the
state of the control logic commands the channel to be on. In the
retry mode the fault can be reset also by pulsing RESETN low for
longer than t RST or by toggling the channel off then on, through
the serial interface. This resets the channel fault and re-enables
the channel from the control logic.
Note that, if the common retry timer has already been activated
by another channel, then the first retry time-out for the second
V STB
V STG
channel may be shorter that the full time. Subsequent retry
sequences will run for the full time-out period minus the short
detection time.
Normal
Operation
Figure 3. Diagnostic Threshold Voltages
Short to Ground
Detected
Off-State Diagnostics: Open Load and Short to Ground
Two current generators and two comparators per channel provide
off-state diagnostic capability. If the voltage at the DRNx termi-
nal, V DRNx , is greater than the open load clamp voltage, V OCL ,
then one of the current generators sinks current to V OCL through
the DRNx terminal. If V DRNx is less than V OCL , then one of the
current generators sources current from V OCL through the DRNx
11
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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| A3946KLB-T | 功能描述:IC MOSFET CONTROLLER 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
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