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MC33293ATV bảng dữ liệu(PDF) 11 Page - Motorola, Inc |
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MC33293ATV bảng dữ liệu(HTML) 11 Page - Motorola, Inc |
11 / 16 page 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 µA 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 |
Số phần tương tự - MC33293ATV |
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Mô tả tương tự - MC33293ATV |
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