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L4972AD013TR Datasheet(PDF) 2 Page - STMicroelectronics |
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L4972AD013TR Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 22 page L4972A 2/22 Table 2. Pin Description Figure 3. Pin Connection (Top view) N° Pin Function 1 BOOTSTRAP A Cboot capacitor connected between this terminal and the output allows to drive properly the internal D-MOS transistor. 2 RESET DELAY A Cd capacitor connected between this terminal and ground determines the reset signal delay time. 3 RESET OUT Open Collector Reset/power Failand the output voltages are safe. Signal Output. This output is high when the supply 4 RESET INPUT Input of Power Fail Circuit. The threshold is 5.1V. It may be connected via a divider to the input for power fail function. It must be connected to the pin 14 an external 30K Ω resistor when power fail signal not required. 5, 6 15, 16 GROUND Common Ground Terminal 7 FREQUENCY COMPENSATION A series RC network connected between this terminal and ground determines the regulation loop gain characteristics. 8 SOFT START Soft Start Time Constant. A capacitor is connected between the sterminal and ground to define the soft start time constant. 9 FEEDBACK INPUT The Feedback Terminal of the Regulation Loop. The output is connected directly to this terminal for 5.1V operation; It is connected via a divider for higher voltages. 10 SYNC INPUT Multiple L4972A’s are synchronized by connecting pin 10 inputs together or via an external syncr. pulse. 11 SUPPLY VOLTAGE Unregulated Input Voltage. 12, 19 N.C. Not Connected. 13 Vref 5.1V Vref Device Reference Voltage. 14 Vstart Internal Start-up Circuit to Drive the Power Stage. 17 OSCILLATOR Rosc. External resistor connected to ground determines the constant charging current of Cosc. 18 OSCILLATOR Cosc. External capacitor connected to ground determines (with Rosc) the switching frequency. 20 OUTPUT Regulator Output. 1 3 2 4 5 6 7 8 9 20 19 18 17 16 14 15 13 12 DIP20 10 11 GND FREQ. COMP. SOFT START SYNC INPUT FEEDBACK IN. N.C. Vi Vref Vstart GND BOOTSTRAP RESET DELAY RESET OUT P. FAIL INPUT GND GND R OSC C OSC N.C. OUTPUT |
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