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TPS6734IP Datasheet(PDF) 5 Page - Texas Instruments |
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TPS6734IP Datasheet(HTML) 5 Page - Texas Instruments |
5 / 22 page TPS6734I FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY SLVS127A – AUGUST 1995 – REVISED JANUARY 1999 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 soft start Soft start causes the output voltage to increase to the regulation point at a controlled rate of rise. The voltage on the charging soft-start capacitor gradually raises the clamp on the error-amplifier output voltage, limiting surge currents at power-up by increasing the current-limit threshold on a cycle-by-cycle basis. Even if SS has no capacitor installed, some distributed capacitance will always be present. A soft-start cycle is initiated when either the enable signal (EN) is switched high, or an overcurrent fault condition triggers the discharge of the soft-start capacitor. overcurrent comparator The overcurrent comparator monitors the current in the power switch. The comparator trips and initiates a soft-start cycle if the power-switch current exceeds 1.5-A peak. On each clock cycle, the power switch turns on and attempts to deliver current until the overcurrent limits are exceeded. enable (EN) A logic low on EN puts the TPS6734 in shutdown mode. In shutdown, the output power switch, voltage reference, and other functions are shut off, the supply current is reduced to 3 µA maximum, and the soft-start capacitor is discharged through a 1-M Ω resistance. The output voltage falls to a diode drop below the input voltage because of the current path from input to output through the inductor and diode. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING D 725 mW 5.8 mW/ °C 464 mW 377 mW P 1175 mW 9.4 mW/ °C 752 mW 611 mW absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Pin voltages: VCC, OUT (see Note 1) – 0.3 V to 15 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS, COMP, EN (see Note 1) – 0.3 V to VCC+ 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peak switch current 1.5 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reference current 2.5 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous power dissipation See Dissipation Rating Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA –40 °C to 85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg –65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 s 260 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to network terminal ground. |
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