Automatic Restart After a Current Fault The LTC1642 will automatically attempt to restart itself after the circuit breaker opens if the FAULT output is tied to the ON pin. The circuit is shown in Figure 5, and the waveforms during a load short in Figure 6. During a continuous current limit such as aload short, the N-channel pass transistor's duty cycle is equal to the circuit breaker timer period, divided by the sum of the circuit breaker and system timer periods. If FAULTis tied to CN then open drain logic should be used to drive the
N74F579DTR N74F579DTR N74F579DTR Price| I I Tj = 25lC VIN RUC _ UlxfllL C(_ffPUT | | | | |
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| ILIW | 12ILIM CPB | j | jj | 7j | | |
| | | | | | ILIMi TOV | 11 ED IN |
| | 7 | iLIM2, ILIM4 IIED TO VIN I | | | |
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N74F579DTR N74F579DTR N74F579DTR on stock| l | | | | | | j - |
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| Inside FX2LP | Outside FX2LP |
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| -200 | 7.5 KBytes USB regs and 4K FIFO buffers | | r---n (OK to populate I m~rg~7WR#I strobes are not | |
| 11FF 1000 | 0.5 KBytes RAM Data (RD#,WR#)' | | active) | |
| | 40 KBytes External Data Memory | 48 KBytes External Code Memory (PSEN#) |
| 3FFF] l l 116 KBytes RAM l l (PSEN#,RD#,WR)J l l 1 1 OOOO L J | (Ok to populate data memory here-RD#/WR# strobes are not active) | (OK to populate program memory here- PSEN# strobe is not active) |
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