L6599AF Datasheet PDF - STMicroelectronics
| Part Number | L6599AF | |
| Description | high voltage resonant controller | |
| Manufacturers | STMicroelectronics | |
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L6599AF
Very low temperature
improved high voltage resonant controller
Datasheet - production data
61
Features
50% duty cycle, variable frequency control of
resonant half bridge
High accuracy oscillator
Up to 500 kHz operating frequency
Two-level OCP: frequency-shift and latched
shutdown
Interface with PFC controller
Latched disable input
Burst mode operation at light load
Input for power-ON/OFF sequencing or
brownout protection
Non-linear soft-start for monotonic output
voltage rise
600 V - rail compatible high-side gate driver
with integrated bootstrap diode and high dv/dt
immunity
-300/700 mA high-side and low-side gate
drivers with UVLO pull-down
Guaranteed for temperatures as low as -50 °C
Applications
Outdoor LED drivers
Street lighting
AC-DC adapters, open frame SMPS
Table 1. Device summary
Order code
Package
Packaging
L6599AFD
L6599AFDTR
SO16N
Tube
Tape and reel
August 2015
This is information on a product in full production.
DocID028175 Rev 3
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www.st.com
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L6599AF
3 Pin connection
Pin connection
Pin no.
1
2
3
4
Type
Css
DELAY
CF
RFmin
Figure 2. Pin connection (top view)
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Table 2. Pin description
Function
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.
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.
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.
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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| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ L6599AF.PDF Datasheet ] | |
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