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| 型号： | MCZ33291LEGR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 8X LOSIDE W/SPI 24SOIC |
| 标准包装： | 1 |
| 类型： | 低端 |
| 输入类型： | SPI |
| 输出数： | 8 |
| 导通状态电阻： | 1.1 欧姆 |
| 电流 - 输出 / 通道： | 500mA |
| 电流 - 峰值输出： | 3A |
| 电源电压： | 9 V ~ 26.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | MCZ33291LEGR2DKR |
FUNCTIONAL DESCRIPTION
SHORTED LOAD FAULT
A short load, or over-current fault can be caused by any
Low = Fault
33291
V PWR
output being shorted directly to supply, or an output
experiencing a current greater than the current limit.
There are three safety circuits progressively in operation
+
–
MOSFET OFF
R L
Output
during load short conditions providing system protection.
They are as follows:
1. The output current of the device is monitored in an
50 μ A
V Thres
2.5 V to 3.5 V
Figure 18. Output OFF Open Load Fault
An Output OFF Open Load Fault is indicates when the
output voltage is less than the Output Threshold Voltage
(V Thres ) of 0.6 to 0.8 x V DD . Since the 33291L outputs function
as switches, during normal operation, each MOSFET output
should either be completely turned ON or OFF. By design,
the threshold voltage was selected to be between the ON and
OFF voltage of the MOSFET. During normal operation, the
ON state V DS voltage of the MOSFET is less than the
threshold voltage and the OFF state V DS voltage is greater
than the threshold voltage. This design approach affords
using the same threshold comparator for Output Open Load
Detect in the OFF state and Short Circuit Detect in the ON
state. (See Figure 19 for an understanding of the Short
Circuit Detect circuit.) With V DD = 5.0 V, an OFF state output
voltage of less than 3.0 V will be detected as an Output OFF
Open Load Fault while voltages greater than 4.0 V will not be
detected as a fault.
The 33291L has an internal pull-down current source of
analog fashion using a SENSEFET approach and
current limited.
2. The output current of the device is sensed by
monitoring the MOSFET drain voltage.
3. The output thermal limit of the device is sensed and
when attained causes only the specific faulted output
to be latched OFF, allowing all remaining outputs to
operate normally.
All three protection mechanisms are incorporated in their
output, affording robust independent output operation.
The analog current limit circuit is always active and
monitors the output drain current. An over-current condition
causes the gate control circuitry to reduce the gate-to-source
voltage imposed on the output MOSFET, re-establishing the
load current in compliance with current limit (1.0 A to 3.0 A)
range. The time required for the current limit circuitry to act is
less than 20 μ s. Therefore, currents higher than 1.0 A to
3.0 A will never be seen for more than 20 μ s (a typical
duration is 10 μ s). If the current of an output attempts to
exceed the predetermined limit of 1.0 A to 3.0 A (2.0 A
nominal), the V DS voltage will exceed the V Thres voltage and
the over-current comparator will be tripped as shown in
50 μ A, illustrated in Figure 18 , page 18 , between the
MOSFET drain and ground. This current source prevents the
output from floating up to V PWR if there is an open load or
internal wire bond failure. The internal comparator compares
the drain voltage with a reference voltage, V Thres (0.6 to 0.8 x
33291
High = Fault
MOSFET ON
V PWR
R L
–
V DD ). If the output voltage is less than this reference voltage,
the 33291L will declare the condition to be an open load fault.
Digital
+
Output
During output switching, especially with capacitive loads,
a false output OFF Open Load Fault may be triggered. To
prevent this false fault from being reported, an internal fault
filter in the range of 25 μ s to 100 μ s is incorporated. The
duration in which a false fault may be reported is a function of
the load impedance (R L ,C L ,L L ), R DS(ON) , and C OUT of the
MOSFET as well as the supply voltage (V PWR ). The rising
edge of CS triggers a built-in fault delay timer which must
time out (25 μ s or 100 μ s) before the fault comparator is
–
Analog +
Vref
V Thres
2.5 to 3.5 V
enabled to detect at faulted threshold. The circuit
automatically returns to normal operation once the condition
causing the Open Load Fault is removed.
Figure 19. Short Circuit Detect and
Analog Current Limiting Circuit
The status of SFPD determines whether the 33291L will
shut down immediately or continue to operate in an analog
current limited mode until either the short circuit (over-
33291L
Analog Integrated Circuit Device Data
18
Freescale Semiconductor
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