Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher FEATURES z 85V to 265V wide range AC voltage input z 700V high voltage MOSFET on the same chip z high voltage start up current source z current mode control z 9V to 38V wide range VDD voltage z fixed 100KHZ switching frequency z automatic skip cycle mode in low load condition The LSP4303 combines a dedicated current mode PWM controller with a high voltage Power MOSFET on the same silicon chip. The internal control circuit offers the following benefits: - Large input voltage range on the VDD pin accommodates changes in auxiliary supply voltage. This feature is well adapted to battery charger adapter configurations. - Automatic burst mode in low load condition. z over temperature, over current and over voltage GENERAL DESCRIPTION - Overvoltage protection in hiccup mode. protection with autorestart z auxiliary under voltage lockout with hysteresis APPLICATIONS z off line low power SMPS, such as DVD/DVB/STB/Electronic Oven/Air conditioner z AC/DC adapter for battery charger z AC/DC LED driver power z standby power supplies for TV or monitors z auxiliary supplies for motor control FUNCTIONAL BLOCK DIAGRAM 1/7 Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Symbol VDS(sw) ID VDD Icomp Parameter Value Unit -0.3~730 V Internally limited A 0~50 V 3 mA Switching Drain Source Voltage Continuous Drain Current Supply Voltage Feedback Current VESDMM Electrostatic Discharge: Machine Model (R=0W; C=200pF) 200 V VESDHBM Electrostatic Discharge: HBM 2000 V Internally limited Tj Junction Operating Temperature Tc Case Operating Temperature -40 to 150 Storage Temperature -55 to 150 Tstg ELECTRICAL CHARACTERISTICS (Tj=25C, VDD=18V, unless otherwise specified) POWER SECTION Symbol BVDSS IDSS Parameter Drain-Source Voltage Off State Drain Current Test Conditions Min. ID=1mA;VCOMP=2V 730 Typ. Max. Unit V VDS=500V; VCOMP=2V; Tj=125C 0.1 15 mA RDSon Static Drain-Source On State Resistance ID=0.4A; RDSon Static Drain-Source On State Resistance ID=0.4A; Tj=100C tf Fall Time ID=0.2A; VIN=300V 100 ns tr Rise Time ID=0.4A; VIN=300V 50 ns VDS=25V 40 pF Coss Drain Capacitance 17 31 SUPPLY SECTION Symbol Parameter Test Conditions IDDch Start Up Charging Current VDS=100V; VDD=0V IDDoff Start Up Charging Current in Thermal Shutdown VDD=5V; VDS=100V Tj > TSD - THYST IDD0 Operating Supply Current; Not Switching ICOMP=2mA 2/7 Min. Typ. Max. -1 3 Unit mA 0.2 mA 5 mA Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher IDD1 Operating Switching Supply Current; ICOMP=0.5mA; ID=50mA 4.5 mA OSCILLATOR SECTION Symbol FOSC Parameter Oscillator Frequency Total Variation Test Conditions Min. Typ. Max. Unit VDD=VDDoff35V; Tj=0~100C 90 100 110 KHZ Test Conditions Min. Typ. Max. Unit FEEDBACK SECTION Symbol Parameter Icomp Feedback Shutdown Current Vcomp=0V 0.9 mA Rcomp COMP Pin Input Impedance ID=0mA 1.2 k PWM COMPARATOR SECTION Symbol Parameter Test Conditions Min. Typ. Max. Unit 0.84 A 200 ns GID Icomp to ID Current Gain IDlim Peak Current Limitation VCOMP=0V td Current Sense Delay to Turn-Off ID=0.4A tb Blanking Time 500 ns Minimum Turn On Time 700 ns Max. Unit tONmin 560 0.56 0.7 OVERTEMPERATURE SECTION Symbol TSD THYST Parameter Thermal Temperature Test Conditions Shutdown Thermal Shutdown Hysteresis 3/7 Min. Typ. 140 170 40 Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher DETAIL DESCRIPTIONS 1. Startup This device includes a high voltage start up current source connected on the drain of the device. As soon as a voltage is applied on the input of the converter, this start up current source is activated as long as VDD is lower than VDDon. When reaching VDDon, the start up current source is switched off and the device begins to operate by turning on and off its main power MOSFET. As the COMP pin does not receive any current from the optocoupler, the device operates at full current capacity and the output voltage rises until reachingthe regulation point where the secondary loop begins to send a current in the optocoupler. At this point, the converter enters a regulated operation where the COMP pin receives the amount of current needed to deliver the right power on secondary side. 2. Feedback A feedback pin controls the operation of the device. Unlike conventional PWM control circuits which use a voltage input (the inverted input of an operational amplifier), the COMP pin is sensitive to current. Figure 9 presents the internal current mode structure. In a real application, the COMP pin is driven with an optocoupler which acts as a pull up. So, it is not possible to really short this pin to ground and the above drain current value is not achievable. Nevertheless, the capacitor C is averaging the voltage on the COMP pin, and when the optocoupler is off (start up or short circuit), it can be assumed that the corresponding voltage is very close to 0 V. 3. Leading Edge Blanking(LEB) At the instant the internal sense FET is turned on,there usually exists a high current spike through the sense FET,caused by the primary side capacitance and secondary side rectifier diode reverse recovery.Excessive voltage across the sense resistor would lead to false feedback operation in the current mode PWM control.To counter this effect,the device employs a leading edge blanking(LEB) circuit. This circuit inhibits the PWM comparator for a short time(typically 500ns)after the sense FET is turned on. 4. Under Voltage Lock Out(UVLO) Once fault condition occurs,switching is terminated and the sense FET remains off. This causes VDD to fall. When VDD reaches the UVLO stop voltage 8V, the protection is reset and the internal high voltage current source charges the VDD capacitor. When VDD reaches the UVLO start voltage 14.5V, the device resumes its normal operation, In this manner, the auto-restart can alternately enable and disable the switching of the power sense FET until the fault condition is eliminated. 5. Thermal Shutdown(TSD) The sense FET and the control IC are integrated in the same chip, making it easier for the control IC to detect the temperature of the sense FET. when the temperature exceeds approximately 170,thermal shutdown is activated. The device turn off the sense FET and the high voltage current source charge VDD. The device will go back to work when the lower threshold temperature about 145 is reached. 6. Over Voltage Protection(OVP) An overvoltage detector on the VDD pin allows the LSP4303 to reset itself when VDD exceeds VDDovp. Note that this event is only latched for the time needed by VDD to reach VDDoff, and then the device resumes normal operation automatically. 4/7 Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher PIN ASSIGNMENT AND PACKAGE TO252-5L PIN Number 1,2 PIN name GND 3 SW 4 COMP 5 VCC Metal Tab Pin Function Description Power MOSFET source and circuit ground referencep. Power MOSFET drain. Also used by the internal high voltage current source during start up phase for charging the external VDD capacitor. Feedback input. The useful voltage range extends from 0V to 1V, and defines the peak drain MOSFET current. The current limitation, which corresponds to the maximum drain current, is obtained for a COMP pin shorted to the GND pin. Power supply of the control circuits. Also provides a charging current during start up thanks to a high voltage current source connected to the drain. For this purpose, an hysteresis comparator monitors the VDD voltage; Connected with SW PSEuropean(195~265Vac) for 20W, US(85~265Vac) for 12W; TYPICAL APPLICATION CIRCUITS 5/7 Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher ORDERING INFORMATION MARKING INFORMATION 6/7 Rev1.0 Liteon Semiconductor Corporation LSP4303 Low Power Off Line SMPS Primary Switcher PACKAGE INFORMATION D A D1 c1 L2 L3 L1 E A1 V e b c e1 Symbol A A1 b c c1 D D1 E e e1 L1 L2 L3 V Dimensions In Millimeters Min. Max. 2.200 2.400 0.000 0.150 0.400 0.630 0.450 0.580 0.450 0.580 6.350 6.850 5.200 5.500 5.400 6.200 1.270TYP. 2.540TYP. 9.000 11.300 0.900 1.630 2.200 2.800 3.800REF Dimensions In Inches Min. Max. 0.087 0.094 0.000 0.006 0.016 0.025 0.018 0.023 0.018 0.023 0.250 0.270 0.205 0.217 0.213 0.244 0.050TYP. 1.000TYP. 0.360 0.452 0.035 0.064 0.087 0.110 0.150REF UPDATE HISTORY Date Version Descriptions 7/7 Rev1.0