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UC1965 Datasheet(PDF) 4 Page - Texas Instruments |
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UC1965 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 6 page 4 UC1965 UC2965 UC3965 UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 For designs requiring input-output isolation, the UC3965 is used in secondary side output voltage sensing. As shown in Fig. 1, the precision reference and low offset error amplifier can be used in converters, such as the isolated flyback, where the primary side error amplifier is not used or simply not present. In this case, the UCC3809 is used as the primary side controller. The precision reference of the UC3965 is tied to the non-inverting input of the device’s internal error amplifier. The output voltage of the converter is resistively divided and compared to this reference at the inverting input. This error amplifier has a low 1mV input offset voltage that insures accurate regulation of the output. The inter- nal error amplifier drives the inverting input of the output buffer (OB) which drives an optocoupler diode. The wide range VCC voltage enables the device to be biased from the secondary side output voltage rail, resulting in closed loop soft start. As the output voltage increases beyond its desired value, the voltage difference at the error amplifier increases. This results in less drive at the inverting input of the inter- nal buffer, increasing its output drive to the optocoupler. If the application does not require input-output isolation, this buffer could be used to drive the PWM directly. APPLICATION INFORMATION For additional application information biasing the UC3965, please refer to the following publication: [1] Application Note U-165, Design Review: Isolated 50W Flyback with the UCC3809 Primary Side Controller and the UC3965 Precision Reference and Error Amplifier,by Lisa Dinwoodie. ADDITIONAL INFORMATION 8 7 6 5 1 2 3 4 EA OB UVLO VREF 2.5V VCC 15k + – 7.5k 5k + – 5k 2k –V OUT +V OUT 8 7 5 6 1 2 4 3 UCC3809 +V IN –V IN FB REF SS RT1 RT2 VDD OUT GND OFFSET VCC VOUT GND COMP VFB VREF NI Figure 1. Typical application diagram. UDG-99080 |
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