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ICE1PCS01 Datasheet(PDF) 8 Page - Infineon Technologies AG |
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ICE1PCS01 Datasheet(HTML) 8 Page - Infineon Technologies AG |
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8 / 18 page  CCM-PFC ICE1PCS01/G Functional Description Preliminary Data Preliminary Datasheet 8 28 May 2003 3.4 System Protection The IC provides several protection features in order to ensure the PFC system in safe operating range. Depending on the input line voltage (VIN) and output bus voltage (VOUT), Figure 6 and 7 show the conditions when these protections are active. Figure 6VIN Related Protection Features Figure 7VOUT Related Protection Features The following sections describe the functionality of these protection features. 3.4.1 Brown-Out Protection (BOP) 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 BOP, 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. The ICE1PCS01/G limits internally the current drawn from the mains and therefore also limits the input power. The difference of input and output power will result in decreasing output voltage. If the condition prolongs, the decreasing VOUT will terminate in output under voltage condition (OUV, 50% of rated), and the IC will be shut down (See section 3.4.5). Figure 8 shows the occurrence of BOP in respect to the ISENSE voltage. Figure 8 BOP, SOC and PCL Protection as function of VISENSE The VIN threshold for BOP to occur is dependent on the voltage at ISENSE and thus the output power. The rated output power with a minimum VIN (VINMIN) is Due to the internal parameter tolerance, the maximum power with VINMIN before BOP occurs is And the BOP takes over the normal operation under rated output power latest at an input voltage of 3.4.2 Soft Over Current Control (SOC) The IC is designed not to support any output power that corresponds to a voltage lower than -0.73V at the ISENSE pin. A further increase in the inductor current, which results in a lower ISENSE voltage, will activate the Soft Over Current Control (SOC). This is a soft control as it does not directly switch off the gate drive like the PCL. It acts on the nonlinear gain block to result in a reduced PWM duty cycle. 3.4.3 Peak Current Limit (PCL) The IC provides a cycle by cycle peak current limitation (PCL). It is active when the voltage at pin 3 (ISENSE) reaches -1.08V. This voltage is amplified by OP1 by a factor of -1.43 and connected to comparator C2 with a reference voltage of 1.5V as shown in Figure 9. A deglitcher with 300ns after the comparator improves noise immunity to the activation of this protection. t VINMIN (1) VIN (VAC) VCC > VCCUVLO Normal Operation IC OFF BOP VCC<VCCUVLO (1) V INMIN where BOP activates depends on the output power IC’s State t VOUT PCL / SOC 16% 50% 100% OLP OLP OUV 105% OVP VOUT,Rated VISENSE -0.6V -0.73V -1.08V Normal Operation SOC PCL POUT(rated) BOP IC’s State 0 (BOP occurs at VISENSE = -0.6V Max) POUT(max) POUT rated () VINMIN 0.6 R1 2 ⋅ --------------------- × = POUT max () VINMIN 0.73 R1 2 ⋅ --------------------- × = VBOPMAX POUT rated () R1 2 ⋅ 0.73 --------------------- × = |
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