Transition-mode PFC controller - STMicroelectronics

1 L6562. Transition-mode PFC controller . 1 Features Figure 1. Packages REALISED IN BCD TECHNOLOGY. Transition-mode CONTROL OF PFC PRE- REGULATORS. PROPRIETARY MULTIPLIER DESIGN FOR DIP-8 SO-8. MINIMUM THD OF AC INPUT current . VERY PRECISE ADJUSTABLE OUTPUT Table 1. Order Codes OVERVOLTAGE PROTECTION Part Number Package ULTRA-LOW ( 70 A) START-UP current L6562N DIP-8. LOW ( 4 mA) QUIESCENT current . L6562D SO-8. EXTENDED IC SUPPLY VOLTAGE RANGE. L6562 DTR Tape & Reel ON-CHIP FILTER ON current SENSE. DISABLE FUNCTION. DESKTOP PC, MONITOR) UP TO 300W. 1% (@ Tj = 25 C) INTERNAL REFERENCE.

2 VOLTAGE HI-END AC-DC ADAPTER/CHARGER. -600/+800mA TOTEM POLE GATE DRIVER WITH ENTRY LEVEL SERVER & WEB SERVER. UVLO PULL-DOWN AND VOLTAGE CLAMP. 2 Description DIP-8/SO-8 PACKAGES ECOPACK . The L6562 is a current -mode PFC controller oper- APPLICATIONS ating in Transition Mode (TM). Pin-to-pin compati- PFC PRE-REGULATORS FOR: ble with the predecessor L6561, it offers improved IEC61000-3-2 COMPLIANT SMPS (TV, performance. Figure 2. Block Diagram COMP MULT CS. 2 3 4. 1. INV - MULTIPLIER AND 40K. THD OPTIMIZER. +. 5pF. VOLTAGE OVERVOLTAGE - +. REGULATOR DETECTION VCC. 8. VCC INTERNAL. SUPPLY 7V R Q 15 V.)

3 25 V. S. R1 7. GD. + UVLO DRIVER. R2 - Starter VREF2. stop ZERO current . DETECTOR. +. V STARTER. V - DISABLE. 6 5. GND ZCD. Rev. 8. November 2005 1/16. L6562. 2 Description (continued). The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range. The output voltage is controlled by means of a voltage-mode error amplifier and a precise (1% @Tj =. 25 C) internal voltage reference. The device features extremely low consumption ( 70 A before start-up and <4 mA running) and includes a disable function suitable for IC remote ON/OFF, which makes it easier to comply with energy saving norms (Blue Angel, EnergyStar, Energy2000, etc.)

4 An effective two-step OVP enables to safely handle overvoltages either occurring at start-up or resulting from load disconnection. The totem-pole output stage, capable of 600 mA source and 800 mA sink current , is suitable for big MOS- FET or IGBT drive which, combined with the other features, makes the device an excellent low-cost solu- tion for EN61000-3-2 compliant SMPS's up to 300W. Table 2. Absolute Maximum Ratings Symbol Pin Parameter Value Unit VCC 8 IC Supply voltage (Icc = 20 mA) self-limited V. --- 1 to 4 Analog Inputs & Outputs to 8 V. IZCD 5 Zero current Detector Max.

5 current -50 (source) mA. 10 (sink). Ptot Power Dissipation @Tamb = 50 C (DIP-8) 1 W. (SO-8) Tj Junction Temperature Operating range -40 to 150 C. Tstg Storage Temperature -55 to 150 C. Figure 3. Pin Connection (Top view). INV 1 8 Vcc COMP 2 7 GD. MULT 3 6 GND. CS 4 5 ZCD. Table 3. Thermal Data Symbol Parameter SO8 Minidip Unit Rth j-amb Max. Thermal Resistance, Junction-to-ambient 150 100 C/W. 2/16. L6562. Table 4. Pin Description N Pin Function 1 INV Inverting input of the error amplifier. The information on the output voltage of the PFC pre- regulator is fed into the pin through a resistor divider.

6 2 COMP Output of the error amplifier. A compensation network is placed between this pin and INV (pin #1) to achieve stability of the voltage control loop and ensure high power factor and low THD. 3 MULT Main input to the multiplier. This pin is connected to the rectified mains voltage via a resistor divider and provides the sinusoidal reference to the current loop. 4 CS Input to the PWM comparator. The current flowing in the MOSFET is sensed through a resistor, the resulting voltage is applied to this pin and compared with an internal sinusoidal-shaped reference, generated by the multiplier, to determine MOSFET's turn-off.

7 5 ZCD Boost inductor's demagnetization sensing input for Transition-mode operation. A negative-going edge triggers MOSFET's turn-on. 6 GND Ground. current return for both the signal part of the IC and the gate driver. 7 GD Gate driver output. The totem pole output stage is able to drive power MOSFET's and IGBT's with a peak current of 600 mA source and 800 mA sink. The high-level voltage of this pin is clamped at about 12V to avoid excessive gate voltages in case the pin is supplied with a high Vcc. 8 Vcc Supply Voltage of both the signal part of the IC and the gate driver. The supply voltage upper limit is extended to 22V min.

8 To provide more headroom for supply voltage changes. Table 5. Electrical Characteristics (Tj = -25 to 125 C, VCC = 12, CO = 1 nF; unless otherwise specified). Symbol Parameter Test Condition Min. Typ. Max. Unit SUPPLY VOLTAGE. VCC Operating range After turn-on 22 V. VCCon Turn-on threshold (1) 11 12 13 V. VCCOff Turn-off threshold (1) V. Hys Hysteresis V. VZ Zener Voltage ICC = 20 mA 22 25 28 V. SUPPLY current . Istart-up Start-up current Before turn-on, VCC =11V 40 70 A. Iq Quiescent current After turn-on mA. ICC Operating Supply current @ 70 kHz 5 mA. Iq Quiescent current During OVP (either static or mA.)

9 Dynamic) or VZCD =150 mV. MULTIPLIER INPUT. IMULT Input Bias current VVFF = 0 to 4 V -1 A. VMULT Linear Operation Range 0 to 3 V. V CS Output Max. Slope VMULT = 0 to V/V. --------------------- VCOMP = Upper clamp V MUL T. K Gain (2) VMULT = 1 V, VCOMP = 4 V 1/V. ERROR AMPLIFIER. VINV Voltage Feedback Input Tj = 25 C V. Threshold (1) V < Vcc < 22 V. Line Regulation Vcc = V to 22V 2 5 mV. IINV Input Bias current VINV = 0 to 3 V -1 A. 3/16. L6562. Table 5. Electrical Characteristics (continued). (Tj = -25 to 125 C, VCC = 12, CO = 1 nF; unless otherwise specified). Symbol Parameter Test Condition Min.

10 Typ. Max. Unit Gv Voltage Gain Open loop 60 80 dB. GB Gain-Bandwidth Product 1 MHz ICOMP Source current VCOMP = 4V, VINV = V -2 -5 mA. Sink current VCOMP = 4V, VINV = V mA. VCOMP Upper Clamp Voltage ISOURCE = mA 6 V. Lower Clamp Voltage ISINK = mA (1) V. current SENSE COMPARATOR. ICS Input Bias current VCS = 0 -1 A. td(H-L) Delay to Output 200 350 ns VCS clamp current sense reference clamp VCOMP = Upper clamp V. VCSoffset current sense offset VMULT = 0 30 mV. VMULT = 5. ZERO current DETECTOR. VZCDH Upper Clamp Voltage IZCD = mA V. VZCDL Lower Clamp Voltage IZCD = mA 1 V. VZCDA Arming Voltage (3) V.