MC33293ATV 查看數據表（PDF） - Motorola => Freescale

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MC33293ATV

QUAD LOW SIDE SWITCH (RDS(on) = 0.25 Ω Max per Output)

Motorola => Freescale 

MC33293A

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).

Figure 13. MC33293A Fault Logic Diagram

Output-Off open-load Fault Report 1

Output-Off open-load Fault Report 2

Output-Off open-load Fault Report 3

Output-Off open-load Fault Report 4

100µA

Fault

Input 1

Input 2

Input 3

Input 4

Single/Dual Select

Input 1 & 2

Input 3 & 4

output-on open-load Fault Report 1

output-on open-load Fault Report 2

output-on open-load Fault Report 3

output-on open-load Fault Report 4

output-on Over-Current Fault Report 1

output-on Over-Current Fault Report 2

output-on Over-Current Fault Report 3

output-on Over-Current Fault Report 4

MOTOROLA ANALOG IC DEVICE DATA

11

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