|Category||Power Management => Telecom Ringers Power Management|
|Title||Telecom Ringers Power Management|
|Description||ti UCC3751, Single Line Ring Generator Controller|
|Company||Texas Instruments, Inc.|
|Datasheet||Download UCC3751D datasheet
Novel Topology for Low-Cost, Efficient The UCC3751 controller is designed for driving a power stage that generGeneration of Ring Voltage ates low frequency, high voltage sinusoidal signals for telephone ringing applications. The controller and the power stage are most suitable for sin Provides DC Offset and "Talk Battery" gle line applications where low cost, high efficiency and minimum parts Voltage for Off-Hook Conditions count are critical. In addition to providing the sinusoidal ringing signal, the Selectable 20, 25 and 50 Hz Ring controller and the power stage are designed to provide the required DC Frequency voltage across the output when the phone goes off-hook. The DC voltage is also added as the offset to the ringing signal. This feature eliminates the Secondary (AC) Current Limiting need to have a separate talk battery voltage power supply as well as relays Allows Removal of AC Voltage under and drivers to switch between the ringing voltage and the talk battery. Off-Hook Conditions Primary Current Limiting to turn Power The UCC3751 directly drives primary side switches used to implement a push-pull resonant converter topology and transformer coupled sampling Stage off under Fault Conditions switches located on the secondary of the converter. For normal ring signal Operates from a Single 12V Supply generation, the primary switching frequency and secondary sampling frequency are precisely offset from each other by the ringing frequency to produce a high voltage low frequency alias signal at the output. The off-hook condition is detected by sensing the AC current and when AC limit is exceeded, the sampling frequency is set to be equal to the primary switching frequency to produce a DC output. The drive signal frequencies are derived from a high frequency (3579545 Hz) crystal. The primary switching frequency is 89.488 kHz and the sampling frequency 50 Hz less depending on the status of frequency select pins FS0 and FS1.
The circuits described in this datasheet are covered under US Patent #5,663,878 and other patents pending.
D1 LIN T1 VIN LR CR2 SAMPLING CIRCUIT UCC3751 12 DRVS 2 RINGEN 6 OHD 4 VDD ENABLE CBYP2 AC SIGNAL CF VOUT CDC DC SIGNAL V1 RSENSE
Input Supply Voltage. 14V Analog Inputs (OHD, DCLIM, XTAL1, XTAL2) Maximum Forced Voltage. to 5V Logic Inputs Maximum Forced Voltage. to 7.5V Reference Output Current (VDD). Internally Limited Output Current (DRV1, DRV2, DRVS) Pulsed. 1.5A Operating Junction Temperature. to +125°C Storage Temperature. to +150°C
Note: Unless otherwise indicated, voltages are referenced to ground and currents are positive into, negative out of, the specific terminals. Pulsed is defined as a less than 10% duty cycle with a maximum duration 500 S.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for to 70°C for the UCC3751 and to +85°C for the TA = TJ.
PARAMETER V12 Supply Current Section Supply Current ENABLE = 0V ENABLE = 5V Internal Reference with External Bypass Section Output Voltage (VDD) Load Regulation Line Regulation Short Circuit Current Output Drivers Section (DRV1, DRV2) Pull Up Resistance Pull Down Resistance Rise Time Fall Time Output Drivers Section (DRVS) Pull Up Resistance Pull Down Resistance Sample Pulse-Width Rise Time Fall Time Current Limit Section OHD Threshold OHD Input Current DCLIM Threshold DCLIM Input Current Frequency Section (Note 1) Primary Switching Frequency Sampling Switching Frequency All cases 3.579545 MHz Crystal = 0, Mode 1, (Note = 0, Mode = 1, Mode Hz VDCLIM = 0V VOHD mV nA ILOAD to 20mA ILOAD to 20mA Mode 1 and 2, (Note 1) CLOAD = 1nF CLOAD 1nF nS ILOAD to 20mA ILOAD to 20mA CLOAD = 1nF CLOAD nS 0mA IVDD < 13V, IVDD = 1mA VDD mV mA TEST CONDITIONS MIN TYP MAX UNITS
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