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LTC2921 Datasheet(PDF) 9 Page - Linear Technology |
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LTC2921 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  LTC2921/LTC2922 Series 9 29212fa Electronic Circuit Breaker Placing a resistor between the VCC and SENSE pins allows the part to detect shorts and excessive currents on the VCC supply. The electronic circuit breaker trips when the voltage across the resistor is >50mV for more than 1 µs. A trip causes a fault condition which interrupts the monitor OPERATIO sequence, and which requires reset of the circuit breaker latch (see Interrupting Events section). Breaker reset is achieved by pulling V1 below the reset threshold for >150 µs after the current falls below the trip point, or by returning from undervoltage lockout on VCC. The timing of a typical start-up sequence for the LTC2921/ LTC2922 is shown in Figure 2. VCCexceedstheundervoltage lockout level at time 0. All monitor inputs settle between the 0.5V monitor threshold and the 0.7V overvoltage threshold by time 1, then a TIMER cycle starts. The TIMER pin reaches 1.2V at time 2, and GATE ramping begins. When the GATE ramp completes at time 3, the automatic remote sense switches close. Another TIMER delay begins at time 4 and finishes at time 5, at which time PG is activated. The timing of a monitor failure and subsequent regular turn-on is shown in Figure 3. Prior to time 1, a successful turn-on sequence had completed. At time 1, monitor V2 falls below the 0.5V reference, triggering an error. The GATE pin, PG pin, and the remote sense switches fall at rates determined by the pull-down currents and loading conditions of each (times 2, 3, 4). At time 5, monitor V2 recovers, and a normal turn-on sequence begins. TI I G DIAGRA S VCC SENSE V1 V2 V3 V4 TIMER GATE PG 01 2 3 4 5 0.7V 0.5V 0.7V 0.5V 0.7V 0.5V 0.7V 0.5V VCC VCC VCC-50mV 1.2V 1.2V UNDERVOLTAGE LOCKOUT LEVEL REMOTE SENSE SWITCH GATE VCC SENSE V1 V2 V3 V4 TIMER GATE PG 12 3 4 5 0.7V 0.5V 0.7V 0.5V 0.7V 0.5V 0.7V 0.5V 0.7V 0.5V VCC VCC VCC-50mV 1.2V 1.2V UNDERVOLTAGE LOCKOUT LEVEL REMOTE SENSE SWITCH GATE Figure 2. Typical Start-Up Sequence Figure 3. Monitor Failure and Start-Up Sequence Timing |
Similar Part No. - LTC2921_15 |
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Similar Description - LTC2921_15 |
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