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UCC2751_10 PDF预览

UCC2751_10

更新时间: 2024-11-05 02:58:39
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
7页 71K
描述
Not Recommended for New Design

UCC2751_10 数据手册

 浏览型号UCC2751_10的Datasheet PDF文件第2页浏览型号UCC2751_10的Datasheet PDF文件第3页浏览型号UCC2751_10的Datasheet PDF文件第4页浏览型号UCC2751_10的Datasheet PDF文件第5页浏览型号UCC2751_10的Datasheet PDF文件第6页浏览型号UCC2751_10的Datasheet PDF文件第7页 
UCC2751  
UCC3751  
PRELIMINARY  
Single Line Ring Generator Controller  
FEATURES  
DESCRIPTION  
Novel Topology for Low-Cost, Efficient The UCC3751 controller is designed for driving a power stage that gener-  
Generation 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-  
gle line applications where low cost, high efficiency and minimum parts  
count are critical. In addition to providing the sinusoidal ringing signal, the  
controller and the power stage are designed to provide the required DC  
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  
need to have a separate talk battery voltage power supply as well as relays  
and drivers to switch between the ringing voltage and the talk battery.  
Provides DC Offset and “Talk Battery”  
Voltage for Off-Hook Conditions  
Selectable 20, 25 and 50 Hz Ring  
Frequency  
Secondary (AC) Current Limiting  
Allows Removal of AC Voltage under  
Off-Hook Conditions  
The UCC3751 directly drives primary side switches used to implement a  
push-pull resonant converter topology and transformer coupled sampling  
switches located on the secondary of the converter. For normal ring signal  
generation, the primary switching frequency and secondary sampling fre-  
quency are precisely offset from each other by the ringing frequency to pro-  
duce 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 ex-  
ceeded, the sampling frequency is set to be equal to the primary switching  
frequency to produce a DC output.  
Primary Current Limiting to turn Power  
Stage off under Fault Conditions  
Operates from a Single 12V Supply  
The drive signal frequencies are derived from a high frequency (3579545  
Hz) crystal. The primary switching frequency is 89.488 kHz and the sam-  
pling frequency is 20, 25 or 50 Hz less depending on the status of fre-  
quency select pins FS0 and FS1.  
The circuits described in this datasheet are covered under US Patent #5,663,878 and other patents pending.  
TYPICAL APPLICATIONS CIRCUIT  
D1  
R
SENSE  
L
IN  
T1  
DC SIGNAL  
C
DC  
V
IN  
V
V
1
12V  
AC SIGNAL  
C
C
F
R2  
L
L
R
R
SAMPLING  
CIRCUIT  
OUT  
12V  
C
BYP1  
9
12  
2
6
4
C
R1  
N:1  
C
BYP2  
VS12  
11 DRV1  
DRVS  
RINGEN  
OHD  
VDD  
ENABLE 10  
Q1  
UCC3751  
5
DCLIM  
DELAY  
1
Q2  
13 DRV2  
GND  
XTAL2 15  
PGND  
14  
FS0  
7
FS1  
8
XTAL1  
16  
3
UDG-98047  
3.579545MHz  
SLUS267A - JULY 1999  

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