전자부품 데이터시트 검색엔진 |
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AMS2027 데이터시트(PDF) 3 Page - Advanced Monolithic Systems |
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AMS2027 데이터시트(HTML) 3 Page - Advanced Monolithic Systems |
3 / 5 page Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS2027 PIN FUNCTIONS Pin Name Pin No. I / O Description Enable /EN 1 I Enable Input, Logic turns power switch on. Ground GND 3 I Ground. Input IN 7 I Power switch input, also supplies IC’s internal circuitry. Error Flag ERROR 2 O Overcurrent, Over temperature, Logic output. Output OUT 6,8 O Power switch output. THERMAL SENSE IN 1.2V REFERENCE CHARGE PUMP UVLO * CS GATE DRIVER CURRENT LIMIT POWER SWITCH OUT ERROR FLAG ENABLE ERROR GND FUNCTIONAL DESCRIPTION Power Switch The power switch is an N-channel MOSFET with a maximum on- state resistance of 140m Ω (V I(IN) = 5.0V, configured as a high-side switch. Charge Pump An internal 100kHz charge pump supplies the power to the driver circuit and provides the required voltage to pull the gate of the MOSFET above the source. The charge pump requires very little supply current and operates from input voltages as low as 3.3V. Gate Driver The driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage, as a result it limits large current surges and reduces the associated electromagnetic interference (EMI) produced. The rise and fall times of the output voltage are typically in the 2ms to 4ms range instead of the microsecond or nanosecond range for a standard FET. Enable A logic high on the /EN input turns off the power switch and the bias for the charge pump, driver, and other circuitry to reduce the supply current to less than 10 µA. A logic zero input restore bias to the drive and control circuits and turns the power on. The enable input is compatible with both TTL and CMOS logic levels. Error Flag The error flag output, is an open drain logic output that is active low when output current exceeds current limit. Until the fault condition is removed the output will remain active low. Current Limit A sense FET monitors the current supplied to the load. In case of an overload or short circuit, the current limit circuitry sends a signal to the driver. The driver will then reduce the gate voltage and drive the power FET into its linear region, which switches the output into a constant current mode and holds the current constant while varying the voltage on the load. Thermal Shutdown The internal thermal shutdown circuit will shut the power switch off when the junction temperature rises to approx. 180°C. Hysterisis is build into the thermal sense circuitry, and after the junction temperature has dropped about 20°C, the switch turns back on. Until the fault is removed the switch will continue to cycle off and on. Undervoltage Lock-out An internal voltage sense monitors the input voltage. When the input voltage is below 3.2V nominal, the switch is turned off by a control signal. The typical fall time range due to the sense of a low voltage is 250 µs to 750µs. BLOCK DIAGRAM *Current Sense |
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