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LTC4350IGNPBF Datasheet(PDF) 5 Page - Linear Technology |
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LTC4350IGNPBF Datasheet(HTML) 5 Page - Linear Technology |
5 / 18 page LTC4350 4350fb Typical perForMance characTerisTics Gain Pin Voltage vs Temperature ∆VGATE vs VCC ∆VGATE vs Temperature pin FuncTions UV(Pin1):UndervoltagePin.Thethresholdissetat1.244V with a 24mV hysteresis. When the UV pin is pulled high, the charge pump ramps the GATE pin. When the UV pin is pulled low, the GATE pin will be pulled low. OV (Pin 2): Overvoltage Pin. The threshold is set at 1.220V with a 15mV hysteresis. When the OV pin is pulled high, the GATE pin is pulled low. After a timer cycle, the STATUS pin is pulled low until the OV pin is pulled low. TIMER (Pin 3): Analog System Timing Generator Pin. This pin is used to set the delay before the load sharing turns on after the UV pin goes high. The other use for the TIMER pin is to delay the indication of a fault on the STATUS pin. When the timer is off, an internal N-channel shorts the TIMER pin to ground. When the timer is turned on, a 2µA or 6µA timer current (ITIMER) from VCC is connected to the TIMER pin and the voltage starts to ramp up with a slope given by: dV/dt = ITIMER/CT. When the voltage reaches the trip point (1.220V), the timer will be reset by pulling the TIMER pin back to ground. The timer period is given by: (1.220V • CT)/ITIMER. GAIN (Pin 4): Analog Output Pin. The voltage across the R+ and R– pins is divided by a 1k resistor and sourced as a current from the GAIN pin. An external resistor on the GAIN pin determines the voltage gain from the current sense resistor to the GAIN pin. COMP2 (Pin 5): Analog Output Pin. This pin is the output of the share bus error amplifier E/A2. (A compensation capacitor between this pin and ground sets the crossover frequency for the power supply adjustment loop.) In most cases, this pin operates between 0.5V to 1.5V and repre- sents a diode voltage up from the voltage at the RSET pin. It is clamped at 3V. During start-up, this pin is clamped to ground. After a timer cycle (and if the GATE pin is high), the COMP2 pin is released. COMP1 (Pin 6): Analog Output Pin. This pin is the output of the voltage regulating error amplifier E/A1. A com- pensation capacitor between this pin and ground sets the crossover frequency of the share bus loop. This pin operates a diode voltage up from the voltage at the SB pin and is clamped at 8.4V. SB (Pin 7): Analog Output Pin. This pin drives the share bus used to communicate the value of shared load current between several power supplies. There is an amplifier that drivesthispinadiodebelowtheCOMP1pinusinganinternal NPN as a pull-up and a 20k resistor as a pull-down. TEMPERATURE (°C) –50 2.2 2.3 2.4 2.5 2.6 2.7 –25 0 25 50 4350 G10 75 100 RGAIN = 25k (VR+ – VR–) = 100mV VCC = 5V VCC (V) 0 10 11 13 6 10 4350 G11 9 8 2 4 8 12 14 7 6 12 TA = 25°C TEMPERATURE (°C) –50 11.0 11.5 12.0 12.5 13.0 –25 0 25 50 4350 G12 75 100 VCC = 5V |
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