this is information on a product in full production. august 2014 docid15534 rev 6 1/32 l6599at improved high voltage resonant controller datasheet - production data 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 bootstra p diode and high dv/dt immunity ? -300/700 ma high-side and low-side gate drivers with uvlo pull-down ? guaranteed for extreme temperature ranges applications ? lcd and pdp tv ? desktop pc, entry-level server ? telecom smps ? high efficiency industrial smps ? ac-dc adapter, open frame smps so16n table 1. device summary order code package packaging l6599atd so16n tube L6599ATDTR tape and reel www.st.com
contents l6599at 2/32 docid15534 rev 6 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1 oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.2 operation at no load or very light load . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.3 soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.4 current sense, ocp and olp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.5 latched shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.6 line sensing function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.7 bootstrap section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
docid15534 rev 6 3/32 l6599at description 32 1 description the l6599at is an improved revision of the prev ious l6599a. it is a double-ended controller specific to series-resonant half bridge topology . it provides 50% 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. a fixed deadtime inserted between t he turn-off of one switch and the turn-on of the other guarantees soft-switching and enables high-frequency operation. to drive the high-side switch with the bootstra p 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 designer to set the operating frequency range of the converter by means of an externally programmable oscillator. at startup, 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 frequ ency shift is non-linear to minimize output voltage overshoots; its duration is programmable as well. at light load the ic may enter a controlled bu rst mode operation that keeps the converter input consumption to a minimum. ic functions include a not-latched active-low di sable 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 restar t. a higher level ocp latches off the ic if the first-level protection is not sufficient to control the prim ary current. their combination offers complete protection against overload and short-circuits. an additional latched disable input (dis) allows easy implem entation of otp and/or ovp. an interface with the pfc controller is provided that enables the pre-regulator to be switched off during fault conditions, such as ocp shutdown and dis high, or during burst mode operation.
block diagram l6599at 4/32 docid15534 rev 6 2 block diagram figure 1. block diagram 9 f f 9 % 2 2 7 + 9 ' , 6 $ % / ( ' , 6 2 8 7 & % 2 2 7 / & |