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UCSR3654SL-D07-T Fiches technique(PDF) 7 Page - Unisonic Technologies |
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UCSR3654SL-D07-T Fiches technique(HTML) 7 Page - Unisonic Technologies |
7 / 9 page UCSR3654S Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 9 www.unisonic.com.tw QW-R129-009.a OPERATION DESCRIPTION (Cont.) Constant Current Operation When the sampled voltage is below 2.0V reference voltage and the error amplifier output reaches its maximum, thus UTC UCSR3654S 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. 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 UCSR3654S 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 UCSR3654S 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. |
Numéro de pièce similaire - UCSR3654SL-D07-T |
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Description similaire - UCSR3654SL-D07-T |
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