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LTC1708-PG Datasheet(PDF) 8 Page - Linear Technology |
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LTC1708-PG Datasheet(HTML) 8 Page - Linear Technology |
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8 / 32 page  8 LTC1708-PG 1708f RUN/SS1, RUN/SS2 (Pins 1, 23): Combination of soft- start, run control inputs and short-circuit detection timers. A capacitor to ground at each of these pins sets the ramp time to full output current. Forcing either of these pins back below 1.0V causes the IC to shut down the circuitry required for that particular controller. Latchoff overvolt- age protection is also invoked via this pin as described in the Applications Information section. SENSE1+, SENSE2+ (Pins 2, 14): The (+) Input to the Differential Current Comparators. The Ith pin voltage and built-in offsets between the SENSE– and SENSE+ pins in conjunction with RSENSE sets the current trip threshold. SENSE1–, SENSE2– (Pins 3, 13): The (–) Input to the Differential Current Comparators. EAIN1, EAIN2 (Pins 4, 12): Receives the remotely sensed feedback voltage for each controller from a resistive divider across the output. The VID section may be used for one resistive divider. FREQSET (Pin 5): Frequency Control Input to the Oscilla- tor. This pin can be left open, tied to ground, tied to INTVCC or driven by an external voltage source. This pin can also be used with an external phase detector to build a true phase-locked loop. STBYMD (Pin 6): Control pin that determines which cir- cuitry remains active when the controllers are shut down and/or provides a common control point to shut down both controllers. See the Operation section for details. FCB (Pin 7): Forced Continuous Control Input. This input acts on both controllers and is normally used to regulate a secondary winding using a resistive divider. An applied input voltage below 0.8V will force continuous synchro- nous operation on both controllers. Do not leave this pin floating. ITH1, ITH2 (Pins 8, 11): Error Amplifier Output and Switch- ing Regulator Compensation Point. Each associated chan- nels’ current comparator trip point increases with this control voltage. SGND (Pin 9): Small-Signal Ground. Common to both controllers, this pin must be routed separately from high current grounds to the common (–) terminals of the COUT capacitors. 3.3VOUT (Pin 10): Output of a linear regulator capable of supplying 10mA DC with peak currents as high as 50mA. ATTNOUT (Pin 15): Divided down output voltage feeding the EAIN pin of the regulator. The VID inputs program a resistive divider between ATTNIN and SGND. ATTNOUT is the tap point on the divider. The voltage on ATTNOUT is 0.8V when the output is in regulation. This pin can be bypassed to SGND with 50pF. ATTNIN (Pin 16): Receives the remotely sensed feedback voltage from the output. VID0 to VID4 (Pins 17 to 21): Digital inputs for controlling the output voltage from 0.925V to 2.0V. Table 1 specifies the output voltage for the 32 combinations of digital inputs. The LSB (VID0) represents 50mV increments in the upper voltage range (2.00V to 1.30V) and 25mV increments in the lower voltage range (1.275V to 0.925V). Logic Low = GND, Logic High = VIDVCC or Float. VIDVCC (Pin 22): VID Input Supply Voltage. Range from 2.7V to 5.5V. Typically this pin is tied to INTVCC. PGND (Pin 28): Driver Power Ground. Connects to the sources of bottom (synchronous) N-channel MOSFETs, an- ode of the Schottky rectifier and the (–) terminal(s) of CIN. INTVCC (Pin 29): Output of the Internal 5V Linear Low Dropout Regulator and the EXTVCC Switch. The driver and control circuits are powered from this voltage source. Must be decoupled to power ground with a minimum of 4.7 µF tantalum or other low ESR capacitor. The INTVCC regulator standby function is determined by the STBYMD pin. EXTVCC (Pin 30): External Power Input to an Internal Switch Connected to INTVCC. This switch closes and supplies VCC power, bypassing the internal low dropout regulator, whenever EXTVCC is higher than 4.7V. See EXTVCC connection in Applications Information section. Do not exceed 7V on this pin. BG1, BG2 (Pins 31, 27): High Current Gate Drives for Bottom (Synchronous) N-Channel MOSFETs. Voltage swing at these pins is from ground to INTVCC. VIN (Pin 32): Main Supply Pin. A bypass capacitor should be tied between this pin and the signal ground pin. PI FU CTIO S |
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