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DISCRETE AND STANDARD ICs GROUP VIPer100™ by A. Russo VIPower Product Marketing AN ADVANCED MONOLITHIC SOLUTION FOR OFF-LINE SMPS PRIMARY CONVERTERS F IP e r1 00 VI Pe r1 00 V ollowing the ever increasing consumer market needs for advanced, albeit cost effective solutions for Off Line Switch Mode Power Supplies, ST has developed the VIPer100. It is the first of a family of monolithic devices for SMPS applications using the well consolidated VIPower M0 technology. VIPer100 combines on the same silicon chip a state-of-the-art PWM circuit with current mode control and a dedicated compensation path, together with an optimized high voltage avalanche rugged Vertical Power MOSFET (600V/3.5A). Housed in the 5 pin TO-220, as well as in the PowerSO-10 surface mounting package, it offers maximum flexibility to designers allowing both primary or secondary regulation loop, despite using around 50% less components than a discrete solution. Start up of the circuit is insured by an internal high voltage current source which is switched off during normal operation. Adjustable switching frequency up to 200KHz is achieved by an external R-C network. Synchronisation to an external clock generator is also possible. A dedicated circuit for limiting the primary current during the start up phase or overload condition, gives a real power limitation and correct soft start without any extra components. OSC DRAIN BK Oscillator Blanking PWM Reference S1 R RS S2 S3 ENB Surref Ref 3 R Q CLK Q Driver RS S1 S2 OVT ROK 0.5V ENB OVC ENB KVDD VDD STB ID Limitation Ref 1 SOURCE BK Ref 2 Error Amp CTRL Comparator 4.5V Drain PWM BK Current sense UV Ref 4 VIPer100 block diagram COMP DECEMBER 1997 DISCRETE AND STANDARD ICs GROUP Built in overtemperature protection offers additional safety and silicon self protection in the case of abnormal operating conditions. Burst mode operation is an additional feature of this device, offering the possibility to operate in stand by mode without extra components. APPLICATIONS The VIPer100 can be efficiently used for implementing a current mode flyback configuration in the discontinuous inductor current mode. It has a maximum power capability of 100W on a European voltage range (180 to 270V AC) and 50W for a universal input voltage range (85 to 270V AC). Set top box, satellite receivers, decoders, v i d e o re c o rd e r s , l a p t o p c o m p u t e r s , monitors, camcorders, television sets represent only a smal selection of the consumer products that can easily benefit f ro m a l l t h e a d v a n t a g e s o f t h e b e s t integrated solution available on the market. GREATER RELIABILITY The increased overall reliability of the system is great due to the approximate 50% reduction in the components used with respect of a similar discrete implementation and complete protection built into the silicon. TYPE VDSS VIPer100 600V ID 3.5A RDS(on) 2.8Ω PACKAGE PowerSO-10 PENTAWATT HV VIPer100 Layout VIPer100 FEATURES Adjustable switching frequency up to 200KHz; Optimized for current mode control topology; Inherent feedforward compensation; Soft-start and enable function; Overcurrent protection; Overtemperature protection; Overvoltage protection; Undervoltage lock-out with hysteresis; Low stand-by current; Integrated start-up supply; Automatic burst mode operation in standby condition; Internally trimmed Zener reference. V I P e r 100 Vertical Intelligent Power Enhanced Regulator Maximum output power to the load 2 DISCRETE AND STANDARD ICs GROUP ADVANTAGES vs MONOLITHIC SOLUTIONS The additional advantages of VIPer100 when compared with existing monolithic solution are numerous. The useful duty cycle range extends from 0% to about 90% for VIPer100, versus the 3% to 70% available on the market. The main benefit for users is the possibility to operate in stand-by mode with nearly zero power output. Larger regulation loop bandwidth. VIPer100 provides a specific path for compensation components (COMP pin), offering a maximum of freedom for the users to adjust the regulation bandwidth with good repetitivity. Excellent line regulation due to the current mode control topology. Better regulation point voltage because of the higher value of this voltage when compared with monolithic solutions available on the market. This allows greater precision of the output voltage especially in the case of primary regulation. A better saturation of the output Power MOSFET at high current values is also assured. VDS (V) VIPer100 - 50W Power Output 110KHz Switching Frequency 600 ID (A) 3 Voltage Current Unlike monolithic devices available on the market the package tab is not sensitive to external influences. ADVANTAGES OF FLYBACK CONVERTERS The main advantages of the Flyback Converters operating in the discontinuous inductor current mode are: All outputs will track each other within +/- 5 to 10% without post-regulation. Dynamic cross-regulation is also very good. The flyback transformer used in the discontinuous mode can be much smaller because the inductive energy stored is only 1/5 to 1/10 of the energy required in comparable continuous mode circuits. Load current in the Power MOSFET output stage is zero during turn-on avoiding turn on losses or turn-on snubber circuits, conducted EMI is also reduced. Regulation loop is easy to compensate because of the single pole (resulting in a single capacitor filter). Transient response is excellent. VDS (V) VIPer100 - 50W Power Output Detail of a Switching Phase ID (A) 600 3 Voltage Current 2.5 500 400 2 400 2 300 1.5 300 1.5 200 1 200 1 100 0.5 100 0.5 500 0 0 -100 0 5,000 10,000 T (ns) 15,000 -0.5 20,000 2.5 0 0 -100 0 100 200 300 400 -0.5 500 T (ns) 3 DISCRETE AND STANDARD ICs GROUP TYPICAL APPLICATION CIRCUITS Two typical application examples for secondary and primary regulation are shown. Both circuits are current mode D2 T1 R1 Flyback Converters operating in the discontinuous inductor current mode. For both circuits the switching frequency is equal to 100KHz. L2 C3 + C6 BR1 1 2 4 + VCC+ C9 R4 R7 R8 C8 R6 C10 + C7 D1 R5 VR1 + C2 3 + DRAIN L1 RTN VDD R2 C1 OPTO1 D3 C4 VIPer100 85 to 270V AC input 50W output OSC C5 F1 SOURCE COMP R3 180 to 270V AC input 100W output L OPTO1 N Off-Line Flyback SMPS with secondary regulation D2 C7 + + C8 + C7' D1 + 3 L1 VCC + C3 BR1 1 2 4 C2 L2 T1 R1 RTN D3 C4 + DRAIN VDD R2 VIPer100 C1 OSC COMP SOURCE F1 C6 R3 C5 85 to 270V AC input 50W output C6' L N Off-Line Flyback SMPS with primary regulation 4 DISCRETE AND STANDARD ICs GROUP VIPer100 by A. Russo & R. Nicoloso - VIPower Prod. Mktg & A. Bailly - Application Lab ADVANCED MONOLITHIC SOLUTION FOR OFF-LINE SMPS PRIMARY CONVERTERS A fter the announcement of the first silicon of the VIPer100 (see express 54) and the enthusiastic reaction of the market,we can now forecast that the final silicon will be ready for preproduction by Q3'97. The VIPer100A, a new option with a higher BVDSS will also be available soon. The new devices provide an unparalleled combination of performance, flexibility and cost-effectiveness, delivering an output power capability of 100W over the European mains voltage range (180 to 270V AC) or 50W for a universal input voltage range (85 to 270V AC), while using more than 50% fewer components than a discrete solution.Key features of the VIPer100/100A include automatic Burst Mode operation in stand-by condition, an integrated startup supply, excellent line regulation due to current mode operation, programmable switching frequency (up to 200kHz) and adjustable current limitation (up to 3A). The automatic Burst Mode operation allows the VIPer100/100A to meet the new German “Blue Angel” Eco Norm with less than 1W total power consumption for the system when working in stand-by. The datasheet for VIPer100 family describes the operation and suggests basic ideas and schematics to implement specific functions. In order to evaluate the performance of the VIPer100 ST has developed two demoboards. Type VDSS ID RDS(on) Package VIPer100/SP VIPer100A/ASP 600V 670V 3A 3A 2.5 3.3 PowerSO-10 PENTAWATT OSC DRAIN ON/OFF VDD OSCILLAT OR UVLO LOGIC SECURIT LATCH Y PWM LATCH R/S F/F Q S S R1 F/F Q R2 R3 OVERTEM P. DETECTO R ERROR AMPLIFIER 0.5V 14µs delay 13V 0.5V 300ns Blanking 4.5V 1V/A CURREN T AMPLIFIER COMP SOURCE JUNE 1997 DISCRETE AND STANDARD ICs GROUP VIPer100 STANDARD DEMOBOARD The VIPer100 standard demoboard is a wide voltage range input off-line single switch Flyback, working at 100kHz and allows the user to choose between primary and secondary regulation. Primary regulation is carried out by the auxiliary winding which delivers the low level supply voltage on the Vdd pin of the device. Secondary regulation is achieved by an optocoupler directly from secondary output voltage. It acts on the COMP pin, and the auxiliary winding delivers the low level supply voltage at a lower value than when in primary regulation configuration, thanks to R7. The internal error amplifier is consequently saturated in high state, sourcing a constant current of about 0.5mA on the COMP pin. No power limitation has been set on the VIPer device, so the demoboard is able to deliver up to 130W in continuous running (for 5 seconds max). The demoboard withstands the no load condition and is fully protected against F1 J1 AC IN L1 2A 1 2 C6 0.1µF 400V 110/230V R1 0.1µF 400V L2 Maximum output power 50W DC output voltage/load Vout = +12V, 4A Operating frequency 100kHz TR1 G6219-00 OREGA + D6 BYT11/400 C1 100µF 400V 220µH TOKO RN114-2/02 SCHAFFNER 20R 90-265V AC D1 1A/400V 220µH TOKO C9 TR2 AC input voltage D3 BYW81/100 C6 1000µF 16V + R2 10R OSC 2 1 OUTPUT C10 1nF 400V 3 C11 10nF 13V COMP ISO1 4N25 SOURCE 5 C4 4.7nF POT1 1K J2 12V DC DRAIN 1 C3 22µF 16V R7 4.7R S1 2 VDD + D5 BZX55C10 GREEN LED D2 1N444B U1 VIPer100 R6 2K 1000µF 16V D4 D7 BZW50-180 R4 3.9K + C7 4 C5 100nF R5 5.1K 2 DISCRETE AND STANDARD ICs GROUP VIPer100 DEMOBOARD FOR SET TOP BOX SMPS The power supply is intended to provide all the voltage used by the set top box board. To guarantee safety conditions, primary and secondary components were implemented in the opposite side of the board. The components TR2, ISO1, and C12 assure the isolation between the primary and secondary circuits, and are subject to safety standards such as VDE and UL. In order to reduce radiated EMI all high current loops have been minimized closing off the associated components one from the other. Output line Voltage Max current Main and Tuner +5.0V 2.3A Tuner +3.3V 0.2A Tuner +28.0V 0.05A Main +12.0V 0.5A U3 LM317H +3.3V IN OUT ADJ R7 1.2K R5 89K F1 MAINS BR1 1A/400V TR1 2A D8 STPS745 2 C2 0.1µF 400V D2 1.5KE200P D3 + C4 47µF 400V RN114-2/02 SCHAFFNER R4 47R 4 BYT11/400 D1 1N4448 TR2 OREGA R1 + U1 VIPer100 R2 5.6K 7 2 3 C3 4.7nF + 470µF 16V +28V C9 U2 LM7812 IN BYW98/100 + C8 1 OSC 4.7µF 16V OUT GND 1000µF 16V 220µF 35V + D6 BZX85C30V +12V C10 100µF 16V GND C12 DRAIN VDD C7 D4 15 D7 LED +5V BYW100/200 16 C5 47µF 16V 10µH + 2200µF 16V 14 D5 17 6 10 + C11 L1 12 13 C6 R6 2K R8 220 1nF Class Y 13V COMP SOURCE 5 C14 1nF C1 100nF R3 4.7K 4 R9 180 ISO1 4N25 R11 1K C13 15nF R10 18K U4 TL431 R12 18K 3