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參數(shù)資料
| 型號： | MC33293ATV |
| 廠商： | MOTOROLA INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | QUAD LOW SIDE SWITCH |
| 中文描述： | 3 A 4 CHANNEL, BUF OR INV BASED PRPHL DRVR, PZFM15 |
| 封裝： | PLASTIC, SIP-15 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 236K |
| 代理商： | MC33293ATV |
MC33293A
11
MOTOROLA ANALOG IC DEVICE DATA
When the Single/Dual Select pin is held at a logic high
state, Control Inputs 1, 2, 3 and 4 are turned OFF and can not
exercise any control over the outputs. In this mode, input
control transfers from a single to a dual mode of operation,
wherein only Input 1 & 2 and Input 3 & 4 have control of
Output 1 plus Output 2, and Output 3 plus Output 4,
respectively. Hence the term “Dual Select” mode of
operation.
Paralleling Outputs
Paralleling outputs may be desirable in the event the
application requires a lower RDS(on) or higher current
switching capability than a single output. The MC33293A can
be operated with all outputs (and therefore all inputs) tied
together but modified operation is to be expected. With all
inputs tied together and depending on the dual or single
select mode used, the paralleled input control current will
either be twice (with the dual mode selected) or four times
(with the single mode selected) that of any single input. Other
expected differences are: RDS(on) will decrease by a factor of
four while the Output-On Open-Load Detect current and the
Output Limiting current will increase by a factor of four. There
will be no change in the Over-Voltage Shutdown Range or
the Output-Off Output-On Open-Load Detect Threshold
Voltage Range. As always, system level thermal design and
verification are important when outputs are paralleled.
FAULT LOGIC OPERATION
General
The Fault Status output (Pin 10) on the MC33293A reports
any one of three possible faults from any one of the four
outputs. The three possible faults are output-on open-load
Fault, output-off open-load Fault and over-current Fault. All
faults from any of the four outputs are OR’d together and
reported by the single Fault Status output-on Pin 10
(Figure 13).
Fault
100
μ
A
output-on Over-Current Fault Report 4
output-on Over-Current Fault Report 3
output-on Over-Current Fault Report 2
output-on Over-Current Fault Report 1
output-on open-load Fault Report 4
output-on open-load Fault Report 3
output-on open-load Fault Report 2
output-on open-load Fault Report 1
Input 3 & 4
Input 1 & 2
Single/Dual Select
Input 4
Input 3
Input 2
Input 1
Output-Off open-load Fault Report 4
Output-Off open-load Fault Report 3
Output-Off open-load Fault Report 2
Output-Off open-load Fault Report 1
Figure 13. MC33293A Fault Logic Diagram
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