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UCC2750 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC2750 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page UCC2750 UCC3750 PRELIMINARY DESCRIPTION The UCC3750 Source Ringer Controller provides a complete control and drive solution for a four quadrant flyback-based ring generator circuit. The IC controls a primary side switch, which is modulated when power transfer is taking place from input to output. It also controls two secondary switches which act as synchronous rectifier switches during positive power flow. These switches are pulse-width-modulated when the power is being delivered back to the source. The UCC3750 has an onboard sine wave reference with programmable frequencies of 20Hz, 25Hz and 50Hz. The reference is derived from a high-frequency (32kHz) crystal connected externally. Two fre- quency-select pins control an internal divider to give a sinusoidal output at 20Hz, 25Hz or 50Hz. The ring generator can also be used at other fre- quencies by supplying externally generated sine-waves to the chip or by clocking the crystal input at a fixed multiple of the desired frequency. Other features included in the UCC3750 are programmable DC current limit (with buffer amplifier), a charge-pump circuit for gate drive voltage, in- ternal 3V and 7.5V references, a triangular clock oscillator and a buffer amplifier for adding programmable DC offset to the output voltage. The UCC3750 also provides an uncommitted amplifier (AMP) for other signal processing requirements. Source Ringer Controller 15 28 2 4 26 27 25 6 5 7 18 16 17 10 OUT2 NEG2 VS2 VDD VS1 VCP OUT1 NEG1 REF ENBL GD3 GD2 5V SINFLT 24 23 1 11 12 OUTDC NEGDC RT RGOOD CT GD1 AMPOUT XTAL1 XTAL2 13 14 22 21 AMPIN FS0 FS1 20 19 V IN 48V UCC3750 9 8 3 SINREF SWRLY GND C17 0.047 µF V OUT 0V –48V V OUT TYPICAL APPLICATION FEATURES • Provides Control for Flyback Based Four Quadrant Amplifier Topology • Onboard Sine Wave Reference with Low THD • Selectable Ringing Frequency for Different Phone Systems (20Hz, 25Hz and 50Hz) • Programmable Output Amplitude and DC Offset • DC Current Limiting for Short Circuit Protection • Secondary Side Voltage Mode Control • Operates from a Single 5V Supply SLUS172A - DECEMBER 1999 UDG-99073 application INFO available |
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