PT5634A Power Factor Correction Control IC DESCRIPTION The PT5634A is a Power Factor Correction control IC for electronic ballast and switching mode power supply application. With a wide bandwidth error amplifier and a wide linear operating range multiplier, the PT5634A is available to operate in Critical Conduction Mode and implement a high PF and excellent THD in wide input voltage application. Furthermore, PT5634A provides a low start-up current and operating current, a precise over-voltage protection and the disable function. FEATURES Critical Conduction Mode (CRM) control Very low start-up current (30μA) Precise reference voltage (±1%) Precise adjustable output over-voltage protection Restart timer Leading edge blocking time Disable function APPLICATIONS Electronic ballast AC-DC adaptor and switching mode power supply BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian Dist.,New Taipei City 23145, Taiwan PT5634A TYPICAL APPLICATION V1.0 2 July 2014 PT5634A ORDER INFORMATION Valid Part Number PT5634A-S Package Type 8 Pins, SOP, 150mil Top Code PT5634A-S PIN CONFIGURATION PIN DESCRIPTION Pin Name INV COMP MULT CS ZCD GND GD VCC V1.0 Description Error amplifier inverting input Error amplifier compensation Multiplier input Current sense Zero current detection System ground Gate driver output IC power supply 3 Pin No. 1 2 3 4 5 6 7 8 July 2014 PT5634A FUNCTION DESCRIPTION UNDER VOLTAGE LOCK OUT AND VOLTAGE CLAMP The turn-on threshold of Under-Voltage Lock-Out (UVLO) circuit is 12.5V, and the turn-off threshold is 10V. In UVLO mode, PT5634A is locked and the start-up current is very low (30μA, typ.). A VCC voltage clamp is added to pervert the device from destroy by over-voltage. When the voltage of VCC reaches the clamp threshold, there is an internal additional current to clamp the VCC voltage. ERROR AMPLIFIER The non-inverting input of error amplifier (EA) is connected to the internal reference 2.5V, and the inverting input INV is connected to the external resistor divider. In typical application, with an external capacitor between INV pin and COMP pin (the output of EA), the EA acts an integrator which detects the PFC output and provides a negative feedback. Generally, the bandwidth of the integrator is designed below 20Hz in order to suppress the 100Hz rippers of PFC output. Additionally, the disable function is built in. When the INV voltage is pulled down below 0.2V, PT5634A will enter disable mode and shut down the driver output GD. OVER-VOLTAGE REGULATOR AND OVER-VOLTAGE PROTECTION The response speed of the low bandwidth integrator is slow and the PFC output could not be stabilized in the conditions of the input line voltage increasing or the load decreasing abruptly. PT5634A provides an over-voltage regulator and an over-voltage protection to limit the PFC output. The over-voltage regulator and the over-voltage protection are implemented by detecting the sink current of COMP. During stable operation, there is not current flowing in the external capacitor (C4) between INV and COMP. However, When the PFC output increases abruptly, the current in R6 and R7 increases, but the INV voltage is stuck in 2.5V and the current in R8 does not change. The increment current in R6 and R7 flows through the capacitor C4 and flows into COMP. When the current flowing into COMP reaches to 24μA, the over-voltage regulator is triggered and decreases the multiplier output rapidly, and then the turn-on time of Power MOSFET decreases and the energy from input line to PFC output decreases. When the current flowing into COMP reaches to 27uA, the over-voltage protection is triggered and shut down the driver output GD. The over-voltage protection has a 20μA hysteresis. In application, the over-voltage increment of PFC output is set by adjusting the valve of R6 and R7. There is a static OVP in COMP which threshold is 2.2V. If the over-voltage protection is triggered, PT5634A will be un-locked in the conditions that the COMP sinking current is below 7μA and the COMP voltage is bigger than 2.2V. MULTIPLIER The multiplier has tow inputs: COMP pin and MULT pin. The MULT pin detects the rectifier line voltage through an external resistor divider. In stable operation, because the COMP voltage is a constant in an AC cycle, the multiplier output is proportional to the MULT voltage, as well as the rectifier line voltage. The multiplier, with a wide linear operating range, has a good linearity in 85V~265V AC input voltage range. The multiplier output is internally clamped to 1.08V in order to limit the PFC current and protect the Power MOSFET. CURRENT SENSE PT5634A connects CS pin to a sense resistor which is connected between the source of Power MOSFET and ground. An internal comparator, connecting to the multiplier output as a reference, detects the CS voltage which is proportional to PFC current. Via detecting the PFC current cycle by cycle, the PFC current is proportional to the multiplier output, as well as the rectifier line voltage. The PFC current is proportional to the input line current too. So, the input line current follows the input line voltage and the PF is nearly 1. V1.0 4 July 2014 PT5634A There is a turn-on spike in CS pin when the Power MOSFET is switched on, which will disturb the PFC current detection. PT5634A inserts a Leading Edge Blank time at the rise edge of GD. The LEB circuit, instead of the conventional RC filter, can minimize the propagation delay. ZERO CURRENT DETECTION In CRM control, it needs to sense the PFC inductor current. When the PFC current decreases to zero, the zero current detection circuit outputs the set signal to the driver output GD and starts a switch cycle. In application circuit, if the energy stored in the inductor releases fully, the drain voltage of the power MOSFET and the ZCD voltage begin to decrease. As soon as the ZCD voltage decreases below the threshold 0.7V, the GD is set to “high” and starts a new cycle. The zero current switch of the MOSFET reduces the power dissipation and the switching noise. V1.0 5 July 2014 PT5634A ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltages referenced to GND. Parameter Symbol Min. Max. Unit (see Note) Power supply VCC 25 V INV input voltage VINV -0.3 7.0 V COMP input voltage VCOMP -0.3 7.0 V MULT input voltage VMULT -0.3 7.0 V CS input voltage VCS -0.3 7.0 V ZCD input voltage VZCD -0.3 7.5 V ZCD output current GD maximum output voltage GD maximum output current Operating temperature Junction temperature operating range Storage temperature IZCD VGD IOMAX Topr Tj Tstg -3 -0.3 -400 -40 -40 3 VCC+0.3 400 +125 +125 +150 mA V mA ℃ ℃ Note: A clamp circuit is integrated. When the VCC voltage exceeds 25V, the clamp circuit pulls down a large current; if the current stands a long time, the device may damage. RECOMMENDED OPERATING CONDITIONS Parameter IC power supply MULT input voltage ZCD current V1.0 Symbol VCC VMULT IZCD 6 Min. VCCUV+ 0 -2 Typ. 14 - Max. 22 3.5 2 Unit V V mA July 2014 PT5634A ELECTRICAL CHARACTERISTICS VCC=14V, TA=25°C. Parameter Supply Characteristics VCC supply under voltage positive voltage threshold VCC supply under voltage negative voltage threshold VCC supply under voltage lockout hysteresis VCC UVLO mode quiescent current In OVP VCC quiescent current In disable mode VCC quiescent current VCC operation current (fPFC=50K) VCC clamp voltage Error Amplifier Characteristics Reference voltage in pin INV Voltage gain Bandwidth COMP maximum output voltage COMP minimum output voltage COMP maximum sink current COMP maximum source current INV Disable threshold INV Restart threshold Multiplier Characteristics MULT input voltage range Factor of multiplier OVP Characteristics OVP threshold OVP current hysteresis Static OVP voltage threshold in COMP Zero Current Detection Characteristics ZCD positive voltage threshold ZCD voltage threshold hysteresis ZCD upper clamp voltage ZCD lower clamp voltage ZCD sink current ZCD source current Maximum delay from ZCD to GD Restart timer Current Sense Characteristics threshold voltage for current sense Propagation delay Leading-edge blanking time Driver (GD) Characteristics Turn-on rise time Turn-off fall time GD clamp voltage GD voltage in UVLO mode V1.0 Symbol Test Conditions Min. Typ. Max. VCCUV+ 11.5 12.5 13.5 VCCUV- 9 10 11 VUVHYS - 2.5 - 22 30 0.9 0.9 25 70 1.2 1.2 6 28 2.475 5 2.1 2.0 -2.0 0.1 0.3 2.5 80 1 5.5 2.25 3.5 -3.0 0.2 0.45 2.525 6 2.4 0.3 0.55 V dB MHz 0~2.5 0.32 0.38 0.44 V 1/V IOVP IHYS VS_OVP 23.5 2.1 27 20 2.25 30.5 2.4 μA VZCD VZCD_HYS VZCD_HIGH VZCD_LOW IZCD_SINK IZCD_SOURCE TDEAD TRESTART -0.3 2.5 -1.5 100 75 1.4 0.7 6.5 0 190 7.0 0.3 400 300 VCS TPKD TLEB 0.98 - 1.08 100 200 1.18 200 400 11 - 50 30 13.5 - 100 70 16 1.1 IQCCUV IQCCOVP IQCCSD ICCOP VCCCLAMP VCC=VCCUV+-0.2V OVP VZCD<0.2V GD: 1nF+10R ICC=10mA VINV GV GB VCOMP_HIGH VCOMP_LOW ICOMP_SINK VINV=2.4V VINV=2.6V VINV=2.6V,VCOMP=4V VINV=2.4V,VCOMP=4V ICOMP_SOURCE VINV_DIS VINV_EN VMULT K VMULT=1V, VCOMP=4V IZCD=2.5mA IZCD=-0.5mA tr tf Vgd_clamp Vgd_s GD: 1nF+10R GD: 1nF+10R VCC=20V Igd=10mA 7 Unit V μA mA V V mA V V mA ns μs V ns ns V July 2014 PT5634A PT5634A VS PT5634 There are some differences between PT5634A and PT5634, even if they have the same pin-out. The Disable function has been relocated, and some parameters have been modified. Parameter PT5634 PT5634A VCC supply under voltage positive/negative voltage threshold Factor of multiplier Threshold voltage for current sense OVP threshold ZCD positive/negative/ lower clamp voltage threshold Enable threshold 12/9.3V 0.5 1.7V 40uA 2.1/1.6/0.5V 0.3V (1) 12.5/10V 0.38 1.08V 27uA 1.4/0.7/0V 0.45V (2) (1) Function located on pin 5 (ZCD) (2) Function located on pin 1 (INV) V1.0 8 July 2014 PT5634A PACKAGE INFORMATION 8 PINS, SOP, 150MIL Symbol A A1 A2 b c D E E1 e L Millimeter Nom. 1.60 0.15 1.40 4.90 6.00 3.90 1.27 BSC. 0.60 - Min. 1.35 0.08 1.20 0.33 0.17 4.70 5.80 3.70 0.38 0 Max. 1.77 0.28 1.65 0.51 0.26 5.10 6.20 4.10 1.27 8 Note: All dimensions meet JEDEC Standard MS-012 AA do not include mold flash or protrusions. V1.0 9 July 2014 PT5634A 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 10 July 2014