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LTC1435 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1435 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 20 page  5 LTC1435 TYPICAL PERFORMANCE CHARACTERISTICS Soft Start: Load Current vs Time Burst Mode Operation PIN FUNCTIONS ever EXTVCC is higher than 4.7V. See EXTVCC connection in Applications Information section. Do not exceed 10V on this pin. Connect to VOUT if VOUT ≥ 5V. PGND (Pin 10): Driver Power Ground. Connects to source of bottom N-channel MOSFET and the (–) terminal of CIN. BG (Pin 11): High Current Gate Drive for Bottom N-Channel MOSFET. Voltage swing at this pin is from ground to INTVCC. INTVCC (Pin 12): Output of the Internal 5V Regulator and EXTVCC Switch. The driver and control circuits are pow- ered from this voltage. Must be closely decoupled to power ground with a minimum of 2.2 µF tantalum or electrolytic capacitor. VIN (Pin 13): Main Supply Pin. Must be closely decoupled to the IC’s signal ground pin. SW (Pin 14): Switch Node Connection to Inductor. Volt- age swing at this pin is from a Schottky diode (external) voltage drop below ground to VIN. BOOST (Pin 15): Supply to Topside Floating Driver. The bootstrap capacitor is returned to this pin. Voltage swing at this pin is from INTVCC to VIN + INTVCC. TG (Pin 16): High Current Gate Drive for Top N-Channel MOSFET. This is the output of a floating driver with a voltage swing equal to INTVCC superimposed on the switch node voltage SW. COSC (Pin 1): External capacitor COSC from this pin to ground sets the operating frequency. RUN/SS (Pin 2): Combination of Soft Start and Run Control Inputs. A capacitor to ground at this pin sets the ramp time to full current output. The time is approximately 0.5s/ µF. Forcing this pin below 1.3V causes the device to be shut down. In shutdown all functions are disabled. ITH (Pin 3): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 2.5V. SFB (Pin 4): Secondary Winding Feedback Input. Nor- mally connected to a feedback resistive divider from the secondary winding. This pin should be tied to: ground to force continuous operation; INTVCC in applications that don’t use a secondary winding; and a resistive divider from the output in applications using a secondary winding. SGND (Pin 5): Small-Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. VOSENSE (Pin 6): Receives the feedback voltage from an external resistive divider across the output. SENSE – (Pin 7): The (–) Input to the Current Comparator. SENSE + (Pin 8): The (+) Input to the Current Comparator. Built-in offsets between SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip thresholds. EXTVCC (Pin 9): Input to the Internal Switch Connected to INTVCC. This switch closes and supplies VCC power when- ILOAD = 50mA 1435 G16 VOUT 20mV/DIV VITH 200mV/DIV 1435 G17 RUN/SS 5V/DIV INDUCTOR CURRENT 1A/DIV |
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Similar Description - LTC1435 |
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