RS2599 High-voltage resonant controller DESCRIPTION The RS2599 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 dead-time 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 nonlinear to minimize output voltage overshoots. 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. 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 Burst-mode operation at light load Input for power-ON/OFF sequencing or brownout protection Latched disable input 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-16L, SOP-16L packages APPLICATIONS LCD & PDP TV Desktop PC, entry-level server Telecom SMPS AC-DC adapter, open frame SMPS 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. Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan RS2599 BLOCK DIAGRAM HV VCC 12 DIS 8 + S UVLO STBY Q 16 DIS 5 - R HVG DRIVER UVLO 17V 15 HVG 14 OUT STANDBY + 1.25V UVLO LEVEL SHIFTER DRIVING LOGIC 2V VBOOT - 1.85V DEAD TIME + VCC LVG DRIVER 11 LVG - RFMIN 10 4 ISEN_DIS CSS Q + S R 1 UVLO + DRIVING LOGIC - 1.25V 6.3V 3 6 ISEN 9 PFC_STOP 0.8V + CF GND 1.5V ISEN_DIS DIS STANDBY VCO 2 7 DELAY LINE Simplified Internal Circuit Architecture APPLICATION CIRCUITS AC IN DC OUT RS6563 V1.0 RS2599 2 Jun 2014 RS2599 ORDERING INFORMATION Device Device Code Y is package & Pin Assignments designator : S : SOP-16 P : DIP-16 Z is Lead Free designator : P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G: Green (Halogen Free with Commercial Standard) RS2599 Y Z PIN ASSIGNMENTS CSS 1 16 VBOOT DELAY CF 2 15 3 FRMIN CSS 1 16 VBOOT DELAY CF 2 15 14 HVG OUT 3 14 HVG OUT 4 13 NC FRMIN 4 13 NC STBY 5 12 VCC STBY 5 12 VCC ISEN 6 11 LVG ISEN 6 11 LVG LINE 7 10 GND LINE 7 10 GND DIS 8 9 DIS 8 9 PFC_STOP SOP-16 PFC_STOP DIP-16 PIN DESCRIPTION Pin Name CSS DELAY CF RFMIN STBY ISEN LINE DIS V1.0 Description 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). Delayed shutdown upon overcurrent. A capacitor and a resistor are connected from this pin to GND to set both the maximum duration of an overcurrent condition before the IC stops switching and the delay after which the IC restarts switching. 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 2V reference and a resistor connected from this pin to GND defines a current that is used to set the minimum oscillator frequency. Burst-mode operation threshold. The pin senses some voltage related to the feedback control, which is compared to an internal reference (1.25V). Current sense input. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. Line sensing input. The pin is to be connected to the high-voltage input bus with a resistor divider to perform either AC or DC (in systems with PFC) brownout protection. Latched device shutdown. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1.85V, shuts the IC down and brings its consumption almost to a “before start-up” level. 3 Pin No. 1 2 3 4 5 6 7 8 Jun 2014 RS2599 Open-drain ON/OFF control of PFC controller. This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. 9 GND Chip ground. 10 LVG Low-side gate-drive output. 11 VCC Supply Voltage of both the signal part of the IC and the low-side gate driver. 12 NC No connected. High-voltage spacer. 13 OUT High-side gate-drive floating ground. 14 HVG High-side floating gate-drive output. 15 High-side gate-drive floating supply Voltage. The bootstrap capacitor connected between this pin and pin 14 (OUT) is fed by an internal synchronous bootstrap diode driven in-phase with the low-side gate-drive. 16 PFC_STOP VBOOT V1.0 4 Jun 2014 RS2599 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 24 Jun 2014