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LT4430 Datasheet(PDF) 6 Page - Linear Technology |
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LT4430 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT4430 6 4430f PI FU CTIO S VIN (Pin 1): This is the input supply that powers all in- ternal circuitry. The input supply range is 3V minimum to 20V maximum and the typical input quiescent current is 1.9mA. Connect a 1µF bypass capacitor directly from VIN to GND. GND (Pin 2): Analog Ground Pin. It is also the negative sense terminal for the internal 0.6V reference. Connect the external feedback divider network that terminates to ground directly to this pin for best regulation and performance. OC (Pin 3): Overshoot Control Pin. A typical 8.5µA current source and a capacitor placed from this pin to GND controls output voltage overshoot on startup and recovery from short-circuit. The typical ramp time is (COC • 0.6V)/8.5µA. If VIN is below VUVLO (its undervoltage lockout threshold), the OC pin is actively held low. The OC pin also ties to the overshoot control amplifier output. This amplifier monitors the FB pin voltage and the error amplifier output. If FB is low due to a short-circuit fault condition, the COMP pin goes high. Logic detects the error amplifier COMP pin high state and activates the overshoot control amplifier. The amplifier responds by discharging the OC capacitor down to the FB voltage plus a built-in offset voltage of 48mV. If the short-circuit condition persists, the amplifier maintains the voltage on OC. If the short-circuit condition goes away, the FB pin recovers under the control of the OC pin. FB (Pin 4): This is the inverting input of the error ampli- fier. The non-inverting input is tied to the internal 0.6V reference. Input bias current for this pin is typically 75nA flowing out of the pin. This pin normally ties 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. COMP (Pin 5): This is the output of the error amplifier. The error amplifier is a true voltage-mode error amplifier and frequency compensation is performed around the amplifier. Typical LT4430 compensation schemes use series R-C in parallel with C networks from the COMP pin to the FB pin. COMP also ties to the overshoot control amplifier logic that detects if the COMP pin is at its high clamp level. The logic activates the overshoot control amplifier if COMP is at its clamp level for longer than 1µs. OPTO (Pin 6): This is the output of the amplifier that drives the optocoupler. The opto driver amplifier uses an inverting gain of six configuration to drive the optocoupler referenced to ground. Driving the optocoupler referenced to GND accommodates low output voltages and eases loop frequency compensation as the secondary feedback path with a traditional “431” topology is eliminated. The opto driver amplifier sources a maximum of 10mA, sinks 350µA typically and is short-circuit protected. |
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