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L8565L-S08-R Datasheet(PDF) 7 Page - Unisonic Technologies |
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L8565L-S08-R Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 13 page L8565 Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 13 www.unisonic.com.tw QW-R114-004.d FUNCTIONAL DESCRIPTION(Cont.) 3. Start-up (Soft-Start) The operation of OTA1 during startup is shown in Fig. 4 and 5. VSENSE ( ) R4 R3+R4 ×VOUT 10.8μA during Soft Start VCOMP R6 C4 C5 UTC L8565 0.8V C3 - + S1 5V - + OTA1 Soft Start 4.0V Fig. 4 Soft Start Circuit Soft Start Normal Operation VOUT<80% rated VOUT>80% rated t av(IIN) Fig. 5 Soft Start With Controlled Current Open-Loop Protect (OLP) It sources a constant 10.8µA into the compensation network at pin 2 (VCOMP). The voltage at this pin rises linearly and so does the amplitude of the input current. As soon as the output voltage VOUT reaches 80% of its rated level, the startup procedure is finished and the normal voltage control takes over. In normal operation, the IC operates with a higher maximum current at OTA1 and therefore with a higher voltage loop gain in order to improve the dynamic behavior of the device. The advantage of this technique is a soft-start function with lower stress for the boost diode but without the risk of audible noise. 4. System Protection The IC is equipped with various protection features to ensure the PFC system in safe operating range. Depending on the input line voltage (VIN) and output bus voltage (VOUT), When these protections are active the conditions are shown in Fig. 6 and 7. The following sections describe the functionality of these protection features. |
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