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USR3651SG-S08-R Datenblatt(PDF) 7 Page - Unisonic Technologies |
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USR3651SG-S08-R Datenblatt(HTML) 7 Page - Unisonic Technologies |
7 / 9 page USR3651S Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 9 www.unisonic.com.tw QW-R103-085.b OPERATION DESCRIPTION(Cont.) IOUT VOUT Large Rcs Small Rcs Figure 3. Adjustable output power by changing RCS Figure 4. Secondary current waveform In CC operation, the CC loop control function of UTC USR3651S will keep a fixed proportion between secondary inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is 2 1 = Tsw Tdemag (2) Thus the output current is given by: PK PK OUT I S N P N 4 1 Tsw Tdemag I S N P N 2 1 I (3) Programmable Cable Drop Compensation UTC USR3651S has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage is generated at INV pin by an internal current flowing into the resistor divider. The current is inversely proportional to the voltage of COMP pin. As a result, it is inversely proportional to the output load current. The voltage drop across the cable is compensated by this offset voltage at INV pin. It can also be programmed by adjusting the resistance of the divider to compensate the drop for various cable lines used. Current Sensing and Leading Edge Blanking Cycle-by-cycle current limiting is offered in UTC USR3651S. The switch current is detected by a sense resistor into the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 900ns leading-edge blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. |
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Ähnliche Beschreibung - USR3651SG-S08-R |
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