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LTC1154 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1154 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 18 page  LTC1154 8 1154fb APPLICATIONS INFORMATION Figure 1. Protecting Resistive Loads manner. The charge and discharge rates have been set to minimize RFI and EMI emissions in normal operation. If a short-circuit or current overload condition is encoun- tered, the gate is discharged very quickly (typically a few microseconds) by a large N-channel transistor. OPERATION Status Output Driver The status circuitry continuously monitors the fault de- tection logic. This open-drain output is driven low when the gate of the MOSFET is driven low by the protection circuitry. The status circuitry is reset along with the input latch when the input, or ENABLE input, is cycled. MOSFET and Load Protection The LTC1154 protects the power MOSFET switch by remov- ing drive from the gate as soon as an overcurrent condition is detected. Resistive and inductive loads can be protected with no external time delay in series with the drain sense pin. Lamp loads, however, require that the overcurrent protection be delayed long enough to start the lamp but short enough to ensure the safety of the MOSFET. Resistive Loads Loads that are primarily resistive should be protected with as short a delay as possible to minimize the amount of time that the MOSFET is subjected to an overload condition. The drain sense circuitry has a built-in delay of approximately 10μs to eliminate false triggering by power supply or load transient conditions. This delay is sufficient to “mask” short load current transients and the starting of a small capacitor (<1μF) in parallel with the load. The drain sense pin can therefore be connected directly to the drain current sense resistor as shown in Figure 1. Inductive Loads Loads that are primarily inductive, such as relays, solenoids and stepper motor windings should be protected with as short a delay as possible to minimize the amount of time that the MOSFET is subjected to an overload condition. The built-in 10μs delay will ensure that the overcurrent protection is not false-triggered by a supply or load transient. No external delay components are required as shown in Figure 2. Large inductive loads (>0.1mH) may require diodes con- nected directly across the inductor to safely divert the stored energy to ground. Many inductive loads have these diodes included. If not, a diode of the proper current rating should be connected across the load, as shown in Figure 2, to safely divert the stored energy. Figure 2. Protecting Inductive Loads + 100μF IRFZ24 15V RLOAD 12Ω 12V CLOAD ≤ 1μF 0.036Ω LTC1154 • F01 IN EN STATUS GND VS DS G SD LTC1154 IN EN STATUS GND VS DS G SD LTC1154 + 100μF IRFZ24 15V 12V, 1A SOLENOID 12V 1N5400 0.036Ω LTC1154 • F02 |
Similar Part No. - LTC1154_11 |
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Similar Description - LTC1154_11 |
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