Description

L6699

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Doc ID 022835 Rev 2

1

Description

The L6699 is a double-ended controller specific to series-resonant half bridge topology.

Both LLC and LCC configurations are supported. It provides symmetrical complementary

duty cycle: the high-side switch and the low-side switch are driven ON/OFF 180° out-of-

phase for exactly the same time. Output voltage regulation is obtained by modulating the

operating frequency. The deadtime inserted between the turn-off of one switch and the turn-

on of the other one is automatically adjusted to best fit the transition times of the half bridge

midpoint. To drive the high-side switch with the bootstrap approach, the IC incorporates a

high voltage floating structure able to withstand more than 600 V with a synchronous-driven

high voltage DMOS that replaces the external fast-recovery bootstrap diode.

The IC enables the user to set the operating frequency range of the converter by means of a

high-accuracy externally programmable oscillator.

At startup, in addition to the traditional frequency-shift soft-start (the switching frequency

starts from a preset maximum value and then decays as far as the steady-state value

determined by the control loop), a proprietary circuit controls the half bridge to prevent hard-

switching from occurring in the initial cycles because of the unbalance in the V·s applied to

the transformer.

At light load the IC can be forced to enter a controlled burst-mode operation that keeps the

converter input consumption as low as possible.

IC protection functions include a current sense input for OCP with frequency shift and

delayed shutdown with automatic restart. Fast shutdown with automatic restart occurs if this

first-level protection cannot control the primary current. Additionally, the IC prevents the

converter from working in or too close to the capacitive mode, to guarantee soft-switching. A

latched disable input (DIS) can be used to implement OTP and/or OVP. The combination of

these protection features offers the highest degree of safety.

Other functions include a not-latched active-low disable input with current hysteresis, useful

for power sequencing or for brownout protection, and an interface with the PFC controller

that enables the switching-off of the pre-regulator during fault conditions or during burst-

mode operation.