参数资料
型号: MC15XS3400CPNAR2
厂商: Freescale Semiconductor
文件页数: 31/52页
文件大小: 0K
描述: IC SWITCH HIGH SIDE QUAD 24-QFN
标准包装: 1,200
类型: 高端开关
输出数: 4
Rds(开): 15 毫欧
内部开关:
电流限制: 5A
输入电压: 6 V ~ 20 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 24-PowerQFN
供应商设备封装: 24-PQFN(12x12)
包装: 带卷 (TR)
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSTIC FEATURES
PROTECTION AND DIAGNOSTIC FEATURES
PROTECTIONS
Over-temperature Fault
The 15XS3400 incorporates over-temperature detection
and shutdown circuitry for each output structure.
Two cases need to be considered when the output
temperature is higher than T SD :
? If the output command is ON: the corresponding output
is latched OFF. FS will be also latched to logic [0]. To
delatch the fault and be able to turn ON again the
outputs, the failure condition must disappear and the
autoretry circuitry must be active or the corresponding
output must be commanded OFF and then ON (toggling
fault_control signal of corresponding output) or
V SUPPLY(POR) condition if V DD = 0 .
? If the output command is OFF: FS will go to logic [0] till
the corresponding output temperature will be below
T SD .
For both cases, the fault register OT[0:3] bit into the status
register will be set to [1]. The fault bits will be cleared in the
status register after a SPI read command.
Over-current Fault
The 15XS3400 incorporates output shutdown in order to
levels are available: OCLO1 or OCLO3 or OCLO4 based on
the state of the OCLO[1,0] bits.
If the load current level ever reaches the over-current
detection level, the corresponding output will latch the output
OFF and FS will be also latched to logic [0]. To delatch the
fault and be able to turn ON again the corresponding output,
the failure condition must disappear and the autoretry
circuitry must be active or the corresponding output must be
commanded OFF and then ON (toggling fault_control signal
of corresponding output) or V SUPPLY(POR) condition if
V DD = 0.
The SPI fault report (OC[0:3] bits) is removed after a read
operation.
In Normal mode using internal PWM module, the
15XS3400 incorporates also a coolin g bulb filament
management if OC_mode and Xenon are set to logic [1]. In
this case, the 1 st step of multi-step over-current protection will
depend to the previous OFF duration, as illustrated in
Figure 6 . The following figure illustrates the current level will
be used in function to the duration of previous OFF state
(toff). The slope of cooling bulb emulator is configurable with
OCOFFCB[1:0] bits.
hson signal
PWM
protect each output structure against resistive short-circuit
condition. This protection is composed by eight predefined
current levels (time dependent) to fit Xenon-HID manners by
default or, 55 W or 28 W bulb profiles, selectable separately
by Xenon bit and 28 W bits (as illustrated Figure 13 ,
page 37 ).
In the first turn-on, the lamp filament is cold and the current
will be huge. fault_control signal transition from logic [0] to [1]
or an autoretry define this event. In this case, the over-current
protection will be fitted to inrush current, as shown in
Figure 5 . This over-current protection is programmable:
OC[1:0] bits select overcurrent slope speed and OCHI1
current step can be removed in case of OCHI bit is set to [1].
Over-current thresholds
Over-current thresholds
Cooling
toff
fault_control
hson
Severe Short-Circuit Fault
Depending on toff
depending to toff
The 15XS3400 provides output shutdown in order to
protect each output in case of severe short-circuit during of
the output switching.
If the short-circuit impedance is below R SHORT , the device
hson signal
PWM
fault_control
hson
In steady state, the wire harness will be protected by
will latch the output OFF, FS will go to logic [0] and the fault
register SC[0:3] bit will be set to [1]. To delatch the fault and
be able to turn ON again the outputs, the failure condition
must disappear and the corresponding output must be
commanded OFF and then ON (toggling fault_control signal
of corresponding output) or V SUPPLY(POR) condition if
V DD = 0.
OCLO2 current level by default. Three other DC over-current
15XS3400
Analog Integrated Circuit Device Data
Freescale Semiconductor
31
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