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AMS2115S-1.8 Datasheet(PDF) 3 Page - Advanced Monolithic Systems |
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AMS2115S-1.8 Datasheet(HTML) 3 Page - Advanced Monolithic Systems |
3 / 4 page Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS2115 PIN FUNCTIONS S/D (Pin 1) This is a shutdown pin that provides GATE drive latchoff capability. The pin is also the input to a comparator referenced to VREF (1.25V). When the pin pulls above VREF, the comparator latches the gate drive to the external MOSFET off. The comparator typically has 150mV of hysteresis and the Shutdown pin can be pulled low to reset the latchoff function. This pin provides overvoltage protection or thermal shutdown protection when driven from various resistor divider schemes. S/D pin is clamped at 2.5V. VIN (Pin 2) This is the input supply for the IC that powers the majority of internal circuitry and provides sufficient gate drive compliance for the external N-channel MOSFET. The typical supply voltage is 12 with 4.5 mA of quiescent current. The maximum operating VIN is 20V and the MOSFET at max. IOUT + 1.6V (worst-case VIN to GATE output swing). GND (Pin 3) Analog Ground. This pin is also the negative sense terminal for the internal 1.25V reference. Connect external feedback divider networks that terminate to GND and frequency compensation components that terminate to GND directly to this pin for best regulation and performance. FB (Pin 4) Adjustable Version This is the inverting input of the error amplifier for the adjustable voltage AMS 2115. The noninverting input is tied to the internal 1.25V reference. Input bias current for this pin is typically – 3 µA flowing out of the pin. This pin is normally tied to a resistor divider network to set output voltage. Tie the top of the external resistor divider directly to the output voltage for best regulation performance. OUT (Pin 4) Fixed Output Voltage This is the input of the error amplifier for the fixed voltage AMS 2115-X. The fixed voltage parts contain a precision resistor divider network to set output voltage. The typical resistor divider current is 1 mA into the pin. Tie this pin directly to the output voltage for best regulation performance. COMP (Pin 5) This is the high impedance gain node of the error amplifier and is used for external frequency compensation. Frequency compensation is generally performed with a series RC network to ground. GATE (Pin 6) This is the output of the error amplifier that drives N-channel MOSFETs with up to 5000pf of “effective” gate capacitance. The typical open-loop output impedance is 2 Ω. When using low input capacitance MOSFETs (,1500pF), a small gate resistor of 2 Ω to 10 Ω dampens high frequency ringing created by an LC resonance that is created by the MOSFET gate’s lead inductance and input capacitance. The GATE pin delivers up to 50mA for a few hundred nanoseconds when slewing the gate of the N-channel MOSFET in response to output load current transients. INEG (Pin 7) This is the negative sense terminal of the current limit amplifier. A small sense resistor is connected in series with the drain of the external MOSFET and is connected between the IPOS and INEG pins. A 50mV threshold voltage in conjunction with the sense resistor value sets the current limit level. The current sense resistor can be low value shut or can be made from a piece of PC board trace. If the current limit amplifier is not used tie the INEG and IPOS to power input voltage. This action disables the current limit amplifier. IPOS (Pin 8) This is the positive sense terminal of the current limit amplifier. Tie this pin directly to the main power input voltage from which the output voltage is regulated. This pin is also the input to a comparator that monitors the power input voltage and keeps the GATE voltage low until power input voltage is at least 1V. This prevents the external N Channel MOSFET to turn on before V power is on thus eliminating possible voltage spikes in the output voltage when powered up. |
Similar Part No. - AMS2115S-1.8 |
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Similar Description - AMS2115S-1.8 |
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