High-voltage resonant controller
Features
■ 50% duty cycle, variable frequency control of resonant
half-bridge
■ High-accuracy oscillator
■ Up to 500kHz 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
■ 600V-rail compatible high-side gate driver with integrated
bootstrap diode and high dV/dt immunity
■ -300/800mA high-side and low-side gate drivers with UVLO
pull-down
■ DIP-16, SO-16N packages
Applications
■ LCD & PDP TV
■ Desktop PC, entry-level server
■ Telecom SMPS
■ AC-DC adapter, open frame SMPS
Order code
Part number | Package | Packaging |
L6599D | SO-16N | Tube |
L6599TR | SO-16N | Tape and reel |
L6599N | DIP-16 | Tube |
DIP-16
SO-16N
Device description
The L6599 is a double-ended controller specific for the resonant
half-bridge topology. It provides 50% complementary duty cycle: the
high-side switch and the low-side switch are driven ON 180°
out-of-phase for exactly the same time.
Output voltage regulation is obtained by modulating the operating
frequency. A fixed deadtime inserted between the turn-OFF of one
switch and the turn-ON of the other one guarantees soft-switching
and enables high-frequency operation.
To drive the high-side switch with the bootstrap approach, the IC
incorporates a high-voltage floating structure able to withstand
more than 600V with a synchronous-driven high-voltage DMOS that
replaces the external fast-recovery bootstrap diode.
The IC enables the designer to set the operating frequency range of
the converter by means of an externally programmable oscillator.
At start-up, to prevent uncontrolled inrush current, the switching
frequency starts from a programmable maximum value and
progressively decays until it reaches the steady-state value
determined by the control loop. This frequency shift is non linear
to minimize output voltage overshoots; its duration is programmable
as well.
The IC can be forced to enter a controlled burst-mode operation at
light load, so as to keep converter's input consumption to a
minimum.
IC's functions include a not-latched active-low disable input with
current hysteresis useful for power sequencing or for brownout
protection, a current sense input for OCP with frequency shift and
delayed shutdown with automatic restart.
A higher level OCP latches off the IC if the first-level protection
is not sufficient to control the primary current. Their combination
offers complete protection against overload and short circuits. An
additional latched disable input (DIS) allows easy implementation
of OTP and/or OVP.
An interface with the PFC controller is provided that enables to
switch off the pre-regulator during fault conditions, such as OCP
shutdown and DIS high, or during burst-mode operation.
Absolute maximum ratings
Symbol | Pin | Parameter | Value | Unit |
VBOOT | 16 | Floating supply voltage | -1 to 618 | V |
VOUT | 14 | Floating ground voltage | -3 to VBOOT -18 | V |
dVOUT /dt | 14 | Floating ground max. slew rate | 50 | V/ns |
VCC | 12 | IC Supply voltage (ICC ≤ 25 mA) | Self-limited | V |
VPFC_STOP | 9 | Maximum voltage (pin open) | -0.3 to VCC | V |
IPFC_STOP | 9 | Maximum sink current (pin low) | Self-limited | A |
VLINEmax | 7 | Maximum pin voltage (Ipin ≤1mA) | Self-limited | V |
IRFmin | 4 | Maximum source current | 2 | mA |
| 1 to 6, 8 | Analog inputs & outputs | -0.3 to 5 | V |
Note: ESD immunity for pins 14, 15 and 16 is guaranteed up to 900V
Block diagram
Pin Connection (Top view)
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