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LT1161 Datasheet(PDF) 4 Page - Linear Technology |
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LT1161 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page 4 LT1161 Supply Pins: The two supply pins are internally connected and must also be externally connected. In addition to providing the operating current for the LT1161, the supply pins also serve as the Kelvin connection for the current sense comparators. The supply pins must be connected to the positive side of the drain sense resistors for proper operation of the current sense. Input Pins: The input pins are active high and each pin activates a separate internal charge pump when switched ON. The input threshold is TTL/CMOS compatible but may be taken as high as 15V with or without the supply powered. Each input has approximately 200mV of hyster- esis and an internal 75k pull-down resistor. Gate Pins: The gate pins drive the power MOSFET gates. When an input is ON, the corresponding gate pin is pumped approximately 12V above the supply. These pins have a relatively high impedance when above the rail (the equivalent of a few hundred kilohms). Care should be taken to minimize any loading by parasitic resistance to ground or supply. Sense Pins: Each sense pin connects to the input of a supply-referenced comparator with a 65mV nominal off- set. When a sense pin is taken more than 65mV below PIN FUNCTIONS supply, the MOSFET gate for that channel is driven low and the corresponding timing capacitor discharged. Each cur- rent-sense comparator operates completely independently. The 65mV typical threshold has a +0.33%/ °C temperature coefficient, which closely matches the TC of drain sense resistors formed from copper PC traces. Some loads require high in-rush currents. An RC time delay can be added between the drain sense resistor and the sense pin to ensure that the current-sense comparator does not false trigger during start-up (see Applications Information). However, a maximum of 10k Ω can be in- serted between a drain sense resistor and the sense pin. If current sense is not required in any channel, the sense pin for that channel is tied to supply. Timer Pins: A timing capacitor CT from each timer pin to ground sets the restart time following overcurrent detec- tion. CT is rapidly discharged to less than 1V and then recharged by a 14 µA nominal current source back to the timer threshold, whereupon restart is attempted. If current sense is not required in any channel, the timer pin for that channel is left open. Ground Pins: The two ground pins are internally con- nected and must also be externally connected. FUNCTIONAL DIAGRA – + – + – + – + OSCILLATOR AND CHARGE PUMP 1.4V 75k 75k 1.4V 3V TIMER 14 µA INPUT 65mV V+ SENSE GATE 1161 FD (Each Channel) |
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