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UC1100G-AG6-R データシート(PDF) 4 Page - Unisonic Technologies |
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UC1100G-AG6-R データシート(HTML) 4 Page - Unisonic Technologies |
4 / 6 page UC1100 Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 4 of 6 www.unisonic.com.tw QW-R129-007.a OPERATION DESCRIPTION The UTC UC1100 is a primary control unit for switch mode charger and adapter applications. It operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC control can achieve high precision CV/CC performance. It uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. Startup control The VCC pin of UTC UC1100 is connected to the line input through a resistor. A large value startup resistor can be used to minimize the power loss in application because the start current of UTC UC1100 is very low. When the VCC voltage reaches VTH (ST), the internal startup circuit is disabled and the IC turns on. Operating Current The Operating current of UTC UC1100 is as low as 320uA. Good efficiency and very low standby power can be achieved. Constant Voltage Operation The output voltage is defined by the transmission ratio between the secondary and auxiliary winding. The UTC UC1100 captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to regulate the output voltage. The auxiliary voltage reflects the output voltage is given by: ) ( V ∆ + V × N N = V O S A AUX (1) W △ here V indicates the drop voltage of the output diode. Figure1. Auxiliary voltage waveform Via a resistor divider connected between the auxiliary winding and FB, the VAUX is sampled at the Tsampling end and it is hold until the next sampling. The sampled voltage is compared with 4V reference voltage and the error is amplified. The error amplifier output reflects the load condition and controls the Toff time to regulate the output voltage, thus constant output voltage can be achieved. Constant Current Operation When the sampled voltage is below 4V reference voltage and the error amplifier output reaches its maximum, thus UTC UC1100 operates in constant-current (CC) mode. The CC point and maximum output power can be externally adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller output power becomes. |
同様の部品番号 - UC1100G-AG6-R |
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同様の説明 - UC1100G-AG6-R |
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