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TC2574-5.0VPA Fiches technique(PDF) 4 Page - TelCom Semiconductor, Inc |
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TC2574-5.0VPA Fiches technique(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 25 page TC2574 4 TC2574-1 1/6/00 0.5A Step-Down Switching Regulator REPRESENTATIVE BLOCK DIAGRAM AND TYPICAL APPLICATION PIN DESCRIPTION Pin No. Pin No 8-Pin PDIP 16-Pin SOIC Symbol Description 512 VIN This pin is the positive input supply for the TC2574 step–down switching regulator. In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present (CIN in Figure 1). 7 14 Output This is the emitter of the internal switch. The saturation voltage VSAT of this output switch is typically 1.0V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. 2 4 SIG Gnd Circuit signal ground pin. See the information about the printed circuit board layout. 4 6 PWR GND Circuit power ground pin. See the information about the printed circuit board layout. 1 3 FB This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier.In the adjustable version of the TC2574 switching regulator, this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. 3 5 ON/OFF It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 µA. The input threshold voltage is typically 1.5V. Applying a voltage above this value (up to +VIN ) shuts the regulator off. If the voltage applied to this pin is ower than 1.5 V or if this pin is left open, the regulator will be in the “on” condition. TC2574 + – + – 3.1V Internal Regulator ON/OFF ON/OFF Latch Freq. Shift 18kHz Reset Thermal Shutdown 3 7 1.0 Amp Switch D1 L1 COUT +VIN CIN VOUT Driver Output PWR GND 1 5 2 For Adjustable version R1 = open, R2 = 0 Ω Load Feedback Unregulated DC Input SIG GND R1 R2 1.0k Current Limit Comparator Fixed gain Error Amplifier + + + – 52kHz Oscillator 1.235V Band-Gap Reference 4 Output Voltage Versions 3.3V 5.0V 12V R2 ( Ω) 1.7k 3.1k 8.84k |
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