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L6599_0807 Fiches technique(PDF) 4 Page - STMicroelectronics |
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L6599_0807 Fiches technique(HTML) 4 Page - STMicroelectronics |
4 / 36 page Pin Settings L6599 4/36 2 Pin Settings 2.1 Connection Figure 1. Pin Connection (Top view) 2.2 Functions GND Css DELAY STBY ISEN LINE LVG VBOOT HVG N.C. Vcc PFC_STOP OUT DIS CF RFmin 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Table 1. Pin functions N. Name Function 1CSS Soft start. This pin connects an external capacitor to GND and a resistor to RFmin (pin 4) that set both the maximum 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 < 1.25V or > 6V, DIS > 1.85V, ISEN > 1.5V, DELAY > 3.5V) to make sure it will be soft-started next, and when the voltage on the current sense pin (ISEN) exceeds 0.8V, as long as it stays above 0.75V. 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 0.8V the capacitor is charged by an internal 150µA current generator and is slowly discharged by the external resistor. If the voltage on the pin reaches 2V, the soft start capacitor is completely discharged so that the switching frequency is pushed to its maximum value and the 150µA is kept always on. As the voltage on the pin exceeds 3.5V the IC stops switching and the internal generator is turned OFF, so that the voltage on the pin will decay because of the external resistor. The IC will be soft-restarted as the voltage drops below 0.3V. In this way, under short circuit conditions, the converter will work intermittently with very low input average power. 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. |
Numéro de pièce similaire - L6599_0807 |
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Description similaire - L6599_0807 |
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