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ICE3PCS03G Datasheet(PDF) 12 Page - Infineon Technologies AG |
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ICE3PCS03G Datasheet(HTML) 12 Page - Infineon Technologies AG |
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12 / 20 page  CCM-PFC ICE3PCS03G Functional Description Version 2.0 12 5 May 2010 Figure 12 Input Brownout Protection 3.8.2 Peak Current Limit (PCL) The IC provides a cycle by cycle peak current limitation (PCL). It is active when the voltage at pin 1 (ISENSE) reaches -0.4V. This voltage is amplified by a factor of - 2.5 and connected to comparator with a reference voltage of 1.0V as shown in Figure 13. A deglitcher with 200ns after the comparator improves noise immunity to the activation of this protection. Figure 13 Peak Current Limit (PCL) 3.8.3 Open Loop Protection (OLP) Whenever VSENSE voltage falls below 0.5V, or equivalently VOUT falls below 20% of its rated value, it indicates an open loop condition (i.e. VSENSE pin not connected) or an insufficient input voltage VIN for normal operation. It is implemented using comparator C2a with a threshold of 0.5V as shown in the IC block diagram in Figure 6. 3.8.4 First Over-Voltage Protection (OVP) Whenever VOUT exceeds the rated value by 8%, the over-voltage protection OVP1 is active as shown in Figure 6. This is implemented by sensing the voltage at VSENSE pin with respect to a reference voltage of 2.7V. A VSENSE voltage higher than 2.7V will immediately turn off the gate, thereby preventing damage to bus capacitor. After bulk voltage falls below the rated value, gate drive resumes switching again. 3.9 Output Gate Driver The output gate driver is a fast totem pole gate drive. It has an in-built cross conduction currents protection and a Zener diode Z1 (see Figure 14) to protect the external transistor switch against undesirable over voltages. The maximum voltage at pin 8 (GATE) is typically clamped at 15V. The output is active HIGH and at VCC voltages below the under voltage lockout threshold VCCUVLO, the gate drive is internally pull low to maintain the off state. Figure 14 Gate Driver Line Filter DBRO1 DBRO2 RBRO1 RBRO2 RBRO3 90 ~ 270 Vac CBRO BOP C8b C8a R S Q Q Brownout Latch 1.25V 1V Brownout Rshunt RCS Full-wave rectifier ISENSE AO2 C5 200ns SGND G=-2.5 1V Iin PCL External MOS GATE Z1 VCC Gate Driver PWM Logic HIGH to turn on LV * LV: Level Shift Reg (17V) |
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