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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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L6699DTR Datenblatt(PDF) 6 Page - STMicroelectronics |
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L6699DTR Datenblatt(HTML) 6 Page - STMicroelectronics |
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6 / 38 page  Pin connections L6699 6/38 Doc ID 022835 Rev 2 4 Pin connections Figure 2. Pin connections (top view) Table 4. Pin functions N. Name Function 1 CSS Soft-start. This pin connects an external capacitor to GND and a resistor to RFmin (pin 4) that set both the initial oscillator frequency and the time constant for the frequency shift that occurs as the chip starts up (soft-start). An internal switch discharges this capacitor every time the chip turns off (VCC < UVLO, LINE < 1.25 V, DIS > 1.85 V, ISEN > 1.5 V, DELAY > 2 V) to make sure it is soft- started next. Additionally the switch is activated when the voltage on the current sense pin (ISEN) exceeds 0.8 V or when the converter is working too close to, or in, the capacitive-mode operation. 2DELAY Delayed shutdown upon overcurrent. A capacitor and a resistor are connected from this pin to GND to set both the maximum duration of an overcurrent condition before the IC stops switching and the delay after which the IC restarts switching. Every time the voltage on the ISEN pin exceeds 0.8 V the capacitor is charged by 350 µA current pulses and is slowly discharged by the external resistor. If the voltage on the DELAY pin reaches 2 V, the soft-start capacitor is completely discharged so that the switching frequency is pushed to its maximum value and the 350 µA current source is kept always on. As the voltage on the DELAY pin exceeds 3.5 V the IC stops switching and the internal generator is turned off, so that the voltage on the pin decays because of the external resistor. The IC is soft-restarted as the voltage drops below 0.3 V. In this way, under short-circuit conditions, the converter works intermittently with very low input average power. If the voltage on the ISEN pin exceeds 1.5 V, the L6699 is immediately stopped and the 350 µA current source is kept on until the voltage on the DELAY pin reaches 3.5 V. Then, the generator is turned off and the voltage on the pin decays because of the external resistor. Also in this case the IC is soft-restarted as the voltage drops below 0.3 V. 3CF Timing capacitor. A capacitor connected from this pin to GND is charged and discharged by internal current generators programmed by the external network connected to pin 4 (RFmin) and determines the switching frequency of the converter. |
Ähnliche Teilenummer - L6699DTR |
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Ähnliche Beschreibung - L6699DTR |
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