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MIC2546-2BM Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC2546-2BM Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page MIC2546/2547 Micrel MIC2546/2547 10 June 2000 Functional Description The MIC2546 and MIC2547 are dual high-side N-channel switches available with active-high or active-low enable in- puts. Fault conditions turn off or inhibit turn-on of the output transistor and activate the open-drain error flag transistor making it sink current to ground. Input and Output INX is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUTX is the source of the output MOSFET. In a typical circuit, current flows from INX to OUTX toward the load. If V OUT is greater than VIN, current will flow from OUTX to INX since the switch is bidirectional when enabled. The output MOSFET and driver circuitry are also designed to allow the MOSFET source to be externally forced to a higher voltage than the drain (V OUT > VIN) when the switch is disabled. In this situation, the MIC2546/47 avoids undesirable current flow from OUTX to INX. Both OUT pins for a given channel must be connected together. Thermal Shutdown Thermal shutdown shuts off the output MOSFET and signals the fault flag if the die temperature exceeds 140 °C. 10°C of hysteresis prevents the switch from turning on until the die temperature drops to 130 °C. Overtemperature detection functions only when the switch is enabled. The MIC2547 features an internal latch which causes the part to remain off after thermal shutdown until a reset pulse is provided via the enable pin. While in current-limit, the thermal shutdown latch prevents on/off cycling of the output. Refer to Figure 2 for timing diagram. The flag remains low until reset. Enable Input ENX must be driven logic high or logic low, or be pulled high or low for a clearly defined input. Floating the input may cause unpredictable operation. ENX should not be allowed to go negative with respect to GND, and V ENX should be less than or equal to V INX. Adjustable Current-Limit The short-circuit current-limit is user-adjustable with an exter- nal set resistor. Current-limit in the range of 100mA to 1.5A is available with a set point accuracy of better than ±20%. The current-limit circuit prevents damage to the output MOSFET and external load. The nominal current-limit value is set with an external resistor between ILIMX and GND. For a desired current-limit, the value of the external set resistor is given by: R 230V I SETX LIMITX = where: 154 Ω < R SET < 2.29kΩ For example, to set a 1A nominal current-limit, R SET is calculated as: 230V 1A 230 = Ω Current through R SETX increases with OUT current. The voltage across R SETX could be monitored with a high imped- ance comparator to provide an indication of output current. R SETX should be between 154Ω and 2.29kΩ (0.5% resistor value). Short-Circuit Protection In the event of a short-circuit, the output current will fold back to approximately 80% of the short-circuit current-limit. Fault Flag FLGX is an N-channel, open-drain MOSFET output. The fault-flag is active (low) for current-limit or thermal shutdown conditions. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. |
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