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LTC4268IDKD-1-TR Datasheet(PDF) 9 Page - Linear Technology |
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LTC4268IDKD-1-TR Datasheet(HTML) 9 Page - Linear Technology |
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9 / 48 page  LTC4268-1 9 42681fa TEMPERATURE (°C) –50 330 25 42681 G28 300 280 –25 0 50 270 260 340 320 310 290 75 100 125 RtON(MIN) = 158k TEMPERATURE (°C) –50 0 50 150 200 250 0 50 75 42681 G29 100 –25 25 100 125 300 RPGDLY = 16.9k RPGDLY = 27.4k TEMPERATURE (°C) –50 285 305 325 25 75 42681 G30 265 245 –25 0 50 100 125 225 205 RENDLY = 90k TYPICAL PERFORMANCE CHARACTERISTICS Minimum PG On Time vs Temperature PG Delay Time vs Temperature Enable Delay Time vs Temperature PIN FUNCTIONS SHDN (Pin 1): Shutdown Input. Used to command the LTC4268-1 to present an invalid signature and remain inactive. Connecting SHDN to VPORTP lowers the signature resistance to an invalid value and disables other LTC4268-1 operations. If unused, tie SHDN to VPORTN. NC (Pin 2): No internal connection. RCLASS (Pin 3): Class Select Input. Used to set the current the LTC4268-1 maintains during classification. Connect a resistor between RCLASS and VPORTN. (See Table 2.) ILIM_EN (Pin 4): Input Current Limit Enable. Used for controlling the LTC4268-1 current limit behavior during powered operation. For normal operation, float ILIM_EN to enable ILIMIT_HIGH current. Tie ILIM_EN to VPORTN to disable input current limit. Note that the inrush current limit will always be active. See Applications Information. VPORTN (Pins 5, 6, 7): Power Input. Tie to the PD Input through the diode bridge. Pins 5, 6 and 7 must be electri- cally tied together. NC (Pin 8): No internal connection. SG (Pin 9): Secondary Gate Driver Output. This pin pro- vides an output signal for a secondary-side synchronous switch. Large dynamic currents may flow during voltage transitions. See the Applications Information for details. VCC (Pin 10): Converter Voltage Supply. Bypass this pin to GND with 4.7μF or greater. This pin has a 20V clamp to ground. VCC has an undervoltage lockout function that turns on when VCC is approximately 15.3V and off at 9.7V. In a conventional “trickle-charge” bootstrapped configura- tion, the VCC supply current increases significantly during turn-on causing a benign relaxation oscillation action on the VCC pin if the part does not start normally. tON (Pin 11): Primary Switch Minimum On Time Control. A programming resistor (RTon)toGNDsetstheminimumtime for each cycle. See Applications Information for details. ENDLY (Pin 12): Enable Delay Time Control. The enable delay time is set by a programming resistor (RENDLY) to GND and disables the feedback amplifier for a fixed time after the turn-off of the primary-side MOSFET. This allows the leakage inductance voltage spike to be ignored for flyback voltage sensing. See Applications Information for details. SYNC (Pin 13): External Sync Input. This pin is used to synchronize the internal oscillator with an external clock. The positive edge of the clock causes the oscillator to discharge causing PG to go low (off) and SG high (on). The sync threshold is typically 1.5V. Tie to ground if unused. See Applications Information for details. |
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