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LTC1255C Datasheet(PDF) 6 Page - Linear Technology |
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LTC1255C Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC1255 OPERATIO Internal Voltage Regulation The output of the TTL-to-CMOS converter drives two regulated supplies which power the low voltage CMOS logic and analog blocks. The regulator outputs are isolated from each other so that the noise generated by the charge pump logic is not coupled into the 100mV reference or the analog comparator. Gate Charge Pump Gate drive for the power MOSFET is produced by an adaptive charge pump circuit which generates a gate voltage substantially higher than the power supply volt- age. The charge pump capacitors are included on-chip and therefore no external components are required to generate the gate drive. The charge pump is designed to drive a 12V Zener diode clamp connected across the gate and source of the MOSFET switch. (One Channel) BLOCK DIAGRA Drain Current Sense The LTC1255 is configured to sense the current flowing into the drain of the power MOSFET in a high-side applica- tion. An internal 100mV reference is compared to the drop across a sense resistor (typically 0.002 Ω to 0.10Ω) in series with the drain lead. If the drop across this resistor exceeds the internal 100mV threshold, the input latch is reset and the gate is quickly discharged via a relatively large N-channel transistor. Controlled Gate Rise and Fall Times When the input is switched ON and OFF, the gate is charged by the internal charge pump and discharged in a controlled manner. The charge and discharge rates have been set to minimize RFI and EMI emissions in normal operation. If a short circuit or current overload condition is encountered, the gate is discharged very quickly (typi- cally a few microseconds) by a large N-channel transistor. 100mV REFERENCE 10 µs DELAY LOW STANDBY CURRENT REGULATOR TTL-TO-CMOS CONVERTER VOLTAGE REGULATOR ANALOG DIGITAL INPUT LATCH R S ONE SHOT OSCILLATOR AND CHARGE PUMP GATE CHARGE AND DISCHARGE CONTROL LOGIC FAST/SLOW GATE CHARGE LOGIC INPUT GATE DRAIN SENSE ANALOG SECTION COMP GND VS LTC1255 • BD |
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Similar Description - LTC1255C |
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