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參數(shù)資料
| 型號： | MCZ33291LEG |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Eight-Output Switch with Serial Peripheral Interface I/O |
| 中文描述： | 8輸出開關(guān)串行外設(shè)接口的I / O |
| 文件頁數(shù)： | 20/25頁 |
| 文件大?。?/td> | 389K |
| 代理商： | MCZ33291LEG |
Analog Integrated Circuit Device Data
Freescale Semiconductor
20
33291L
FUNCTIONAL DESCRIPTION
The eight output-off open-load faults are therefore most
easily detected.
If for a specific output the initial SI command bit were a
logic low, when calling for the output to be programmed
on
,
the next word command entered into the corresponding bit
returns with a logic high on SO. An output overcurrent fault
would be indicated. An overcurrent fault is always reported by
the SO output and is independent of the logic state existing
on the SFPD pin. When the SFPD pin is in a logic high state,
an overcurrent condition will be reported on the SO pin.
However, limiting output current is in effect and the output is
permitted to operate if the overcurrent condition does not
drive output into an overtemperature fault. An
overtemperature fault will shut down the specific output
effected for the duration of the overtemperature condition.
Overcurrent and overtemperature faults are often related.
Turning the effected output switches OFF and waiting for
some time to allow the output to cool down should make
these types of faults go away.
Soft
overcurrent faults can
sometimes be determined over hard short faults and
overtemperature faults by observing the time required for the
device to recover. However, in general overcurrent and
overtemperature faults cannot be differentiated in normal
application usage.
An advantage of the synchronous serial output is multiple
faults can be detected with only one (SO) pin being used for
fault status reporting.
If V
PWR
experiences an overvoltage condition, all outputs
will immediately be turned OFF and remain latched OFF. A
new command word is required to turn the outputs back ON
following an overvoltage condition.
Output Voltage Clamping
Each output of the 33291L incorporates an internal voltage
clamp to provide fast turn-off and transient protection of the
output. Each clamp independently limits the drain-to-source
voltage to 53 V at drain currents of 0.5 A and keeps the
output transistors from avalanching by causing the transient
energy to be dissipated in the linear mode (see
Figure 20
).
The total energy clamped (E
J
) can be calculated by
multiplying the current area under the current curve (I
A
) times
the clamp voltage (V
CL
) times the duration the clamp is active
(t).
Characterization of the output clamps, using a single pulse
non-repetitive method at 0.5 A, indicates the maximum
energy to be 50 mJ at 150
°
C junction temperature per output.
Figure 20. Output Voltage Clamping
THERMAL CHARACTERIZATION
THERMAL MODEL
Logic functions take up a very small area of the die and
generate negligible power. In contrast, the output transistors
take up most of the die area and are the primary contributors
of power generation. The thermal model illustrated in
Figure 21
, page
21
, was developed for the 33291L mounted
on a typical PC board. The model is accurate for both steady
state and transient thermal conditions. The components R
d0
through R
d7
represent the steady state thermal resistance of
the silicon die for transistor outputs 0 through 7, while C
d0
through C
d7
represent the corresponding thermal
capacitance of the silicone die translator outputs and plastic.
The device area and die thickness determine the values of
these specific components.
The thermal impedance of the package from the internal
mounting flag to the outside environment is represented by
the terms R
pkg
and C
pkg
. The steady state thermal resistance
of leads and the PC board make up the steady state package
thermal resistance, R
pkg
. The thermal capacitance of the
package is made up of the combined capacitance of the flag
and the PC board. The mode compound was not modeled as
a specific component but it is factored into the other overall
component values.
The battery voltage in the thermal model represents the
ambient temperature the device and PC board are subjected
to. The I
PWR
current source represents the total power
dissipation and is calculated by totalling the power dissipation
of each individual output transistor. This is easily
accomplished by knowing R
DS(ON)
and load current of the
individual outputs.
Very satisfactory steady state and transient results are
experienced with this thermal model. Tests indicate the
model accuracy to have less than 10 percent error. Output
interaction with an adjacent output is believed to be the main
contributor to the thermal inaccuracy. Tests indicate little or
no detectable thermal effects caused by distant output
transistors isolated by one or more other outputs. Tests were
Current
Area (I
A
)
VPWR
Time
GND
Drain-to-Source ON
Voltage (V
DS(ON)
)
Drain Current
(ID = 0.5 A)
Drain-to-Source Clamp
Voltage (VCL = 65 V)
Drain Voltage
Clamp Energy
(E
J
= I
A
x V
CL
x t)
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| MCZ33291LEGR2 | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SER SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG | 功能描述:電源開關(guān) IC - 配電 OCTAL SERIAL SWITCH RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Eight Output Switch with Serial Peripheral Interface I/O |
| MCZ33298EGR2 | 功能描述:電源開關(guān) IC - 配電 OCTAL SERIAL SWITCH RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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