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LTC1154CS8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1154CS8 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LTC1154 S APPLICATI I FOR ATIO The Y axis of the graph is normalized to one RC time constant. The X axis is normalized to the current. (The set current is defined as the current required to develop 100mV across the drain sense resistor). Note that the shutdown time is shorter for increasing levels of MOSFET current. This ensures that the total energy dissipated by the MOSFET is always within the bounds established by the manufacturer for safe opera- tion. (See MOSFET data sheet for further information). Using a Speed-Up Diode To reduce the amount of time that the power MOSFET is in a short-circuit condition, “bypass” the delay resistor with a small signal diode as shown in Figure 6. The diode will engage when the drop across the drain sense resistor exceeds about 0.7V, providing a direct path to the sense pin and dramatically reducing the amount of time the Figure 7. Reverse Battery Protection MOSFET is in an overload condition. The drain sense resistor value is selected to limit the maximum DC current to 2.8A. The diode conducts when the drain current exceeds 20A and reduces the turn-off time to 15 µs. Reverse Battery Protection The LTC1154 can be protected against reverse battery conditions by connecting a resistor in series with the ground lead as shown in Figure 7. The resistor limits the supply current to less than 50mA with – 12V applied. Figure 8. Supply Filter for Current Limited Supplies IN EN STATUS GND VS DS G SD LTC1154 0.1 Ω IRLR024 SHORT CIRCUIT 0.1 µF 100k LTC1154 • F08 *20 Ω + 47 µF* + 10 µF 1N4148 *SUPPLY FILTER COMPONENTS + 100 µF 5V/2A REGULATOR >7V Figure 6. Using a Speed-Up Diode Since the LTC1154 draws very little current while in normal operation, the drop across the ground resistor is minimal. The 5V µP (or control logic) is protected by the 10k resistors in series with the input and status pins. Current Limited Power Supplies The LTC1154 requires at least 3.5V at the supply pin to ensure proper operation. It is therefore necessary that the supply to the LTC1154 be held higher than 3.5V at all times, even when the output of the switch is short circuited to ground. The output voltage of a current limited regulator may drop very quickly during short circuit and pull the supply pin of the LTC1154 below 3.5V before the shut- down circuitry has had time to respond and remove drive from the gate of the power MOSFET. A supply filter should IN EN STATUS GND VS DS G SD LTC1154 + 100 µF IRF530 15V 12V 0.036 Ω LTC1154 • F06 0.01 µF 100k 1N4148 LOAD IN EN STATUS GND VS DS G SD LTC1154 MTP12N06 15V 12V 0.05 Ω LTC1154 • F07 LOAD 10k 300 Ω 5V µP OR CONTROL LOGIC + 10 µF 10k 10k 120k 5V 10k |
Similar Part No. - LTC1154CS8 |
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Similar Description - LTC1154CS8 |
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