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ICE2PCS03 Datasheet(PDF) 8 Page - Infineon Technologies AG |
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ICE2PCS03 Datasheet(HTML) 8 Page - Infineon Technologies AG |
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8 / 19 page  CCM-PFC ICE2PCS03/G Functional Description Version 2.0 8 10 October 2007 . Figure 5 Startup with controlled maximum current 3.4 System Protection The IC provides several protection features in order to ensure the PFC system in safe operating range: • VCC Undervoltage Lockout (UVLO) • Input Brown-out Detection (IBOP) • Soft Over Current Control (SOC) • Peak Current Limit (PCL) • Open-Loop Detection (OLP) • Output Over-Voltage Protection (OVP) After the system is supplied with the correct level of VCC and VIN, the system will enter into its normal mode of operation. Figure 6 shows situation when these protections features are active, as a function of the output voltage VOUT. An activation of the UVLO, IBOP and OLP results in the internal fault signal going high and brings the IC into the standby mode. As the function of UVLO has already described in the earlier “Power Supply” section, the following sections continue to describe the functionality of these protection features. Figure 6 Protection Features 3.4.1 Input Brown-Out Protection (IBOP) Brown-out occurs when the input voltage VIN falls below the minimum input voltage of the design (i.e. 85V for universal input voltage range) and the VCC has not entered into the VCCUVLO level yet. For a system without IBOP, the boost converter will increasingly draw a higher current from the mains at a given output power which may exceed the maximum design values of the input current. ICE2PCS03/G provides a new IBOP feature whereby it senses directly the input voltage for Input Brown-Out condition via an external resistor/capacitor/diode network as shown in Figure 7. This network provides a filtered value of VIN which turns the IC on when the voltage at pin 4 (VINS) is more than 1.5V. The IC enters into the standby mode when VINS goes below 0.71V. The hysteresis prevents the system to oscillate between normal and standby mode. Note also that VIN needs to at least 20% of the rated VOUT in order to overcome OLP and powerup the system. Figure 7 Input Brown-Out Protection (IBOP) av(IIN) VOUT t VOUT =rated 95%rated Window Detect Normal Control t Max Vcomp current 83%rated VCOMP Level-shifted VCOMP t VOUT PCL / SOC 20% 100% OLP OLP 108% OVP VOUT,Rated UVLO / IBOP Supply related Current related Output related ICE2PCS03/G 85 ... 265 VAC Vin C1 D2 ... D5 VINS C4 C5 R S 1.5V 0.71V Brown-Out Detection R8 R9 C6 D7 brown-out 80k 3.5V |
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Similar Description - ICE2PCS03 |
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