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UC1725 Scheda tecnica(PDF) 3 Page - Texas Instruments |
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UC1725 Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 5 page PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ENABLE SECTION (PIN 6) High Level Input Voltage 2.1 1.4 V Low Level Input Voltage 1.4 .8 V Input Bias Current -250 -500 µA OUTPUT SECTION Output Low Level IOUT = 20mA 0.35 0.5 V IOUT = 200mA 0.6 2.5 V Output High Level IOUT = -20mA 13 13.5 V IOUT = -200mA 12 13.4 V VCC = 30V, Iout = -20mA 14 15 V Rise/Fall Time CT = 1nf 30 60 ns UNDER VOLTAGE LOCKOUT UVLO Low Saturation 20mA, VCC = 8V 0.8 1.5 V Start-up Threshold 11.2 12 12.6 V Threshold Hysteresis .75 1.0 1.12 V TOTAL STANDBY CURRENT Supply Current 12 16 ma UC1725 UC2725 UC3725 ELECTRICAL CHARACTERISTICS (cont.) (Unless otherwise stated, these specifications apply for -55 °C≤TA≤+125°C for UC1725; -25 °C≤TA≤+85°C for UC2725; 0°C≤TA≤+70°C for UC3725; VCC (pin 3) = 0 to 15V, Rt=10k, CT=2.2nf, TA =TJ, pin numbers refer to DIL-8 package.) INPUTS: Figure 1 shows the rectification and detection scheme used in the UC1725 to derive both power and signal information from the input waveform. Vcc is gener- ated by peak detecting the input signal via the internal bridge rectifier and storing on a small external capacitor, C1. Note that this capacitor is also used to bypass high pulse currents in the output stage, and therefore should be placed direclty between pins 1 and 3 using minimal lead lengths. Signal detection is performed by the internal hysteresis comparator which senses the polarity of the input signal as shown in Figure 2. This is accomplished by setting (resetting) the comparator only if the input signal ex- ceeds Vcc (-Vcc). In some cases it may be necessary to add a damping resistor across the transformer secondary to minimize ringing and eliminate false triggering of the hysteresis amplifier as shown in Figure 3. APPLICATION AND OPERATION INFORMATION FIGURE 1 - Input Stage FIGURE 2 - Input Waveform (DIL-8 Pin 7 - Pin 8) FIGURE 3 - Signal Detection UDG-92047 UDG-92048 UDG-92049 3 |
Codice articolo simile - UC1725_12 |
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Descrizione simile - UC1725_12 |
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