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L6599ATDTR 데이터시트(PDF) 5 Page - STMicroelectronics

부품명 L6599ATDTR
상세설명  Improved high voltage resonant controller
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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DocID15534 Rev 7
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L6599AT
Pin connection
32
3
Pin connection
Figure 2. Pin connection (top view)
Table 2. Pin description
Pin no.
Type
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 < 1.24 V or > 6 V, DIS > 1.85 V, ISEN > 1.5
V, DELAY > 2 V) to make sure it is soft-started next, and when the voltage on the current
sense pin (ISEN) exceeds 0.8 V, as long as it stays above 0.75 V.
2DELAY
Delayed shutdown upon overcurrent. A capacitor and a resistor are connected from this pin
to GND to set 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 an internal 150 µA current generator
and is slowly discharged by the external resistor. If the voltage on the pin reaches 2 V, the
soft-start capacitor is completely discharged so that the switching frequency is pushed to its
maximum value and the 150 µA is kept always on. As the voltage on the 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.
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.
4RFmin
Minimum oscillator frequency setting. This pin provides a precise 2 V reference and a
resistor connected from this pin to GND defines a current that is used to set the minimum
oscillator frequency. To close the feedback loop that regulates the converter output voltage
by modulating the oscillator frequency, the phototransistor of an optocoupler is connected to
this pin through a resistor. The value of this resistor sets the maximum operating frequency.
An R-C series connected from this pin to GND sets frequency shift at startup to prevent
excessive energy inrush (soft-start).


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