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UCC3752D PDF预览

UCC3752D

更新时间: 2024-11-11 02:58:51
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
6页 75K
描述
Resonant Ring Generator Controller

UCC3752D 数据手册

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UCC2752  
UCC3752  
PRELIMINARY  
Resonant Ring Generator Controller  
FEATURES  
DESCRIPTION  
Novel Topology for Low-Cost, Efficient The UCC3752 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 up to  
5 line applications where low cost, high efficiency and minimum parts count  
are critical. A semi-regulated DC voltage is added as an offset to the ring-  
ing signal. The ring generator operation is non-isolated and open loop.  
Suitable for Multi-Line Operation  
Selectable 20, 25 and 50 Hz Ring  
Frequency  
Secondary (AC) Current Limiting  
Generates an Off-Hook Detect Signal  
The UCC3752 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, a flag is generated on the OFFHOOK pin.  
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 89.489 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 APPLICATION  
D1  
R
SENSE  
L
IN  
T1  
DC SIGNAL  
AC SIGNAL  
C
DC  
V
IN  
V
V
1
12V  
L
L
R
R
C
C
F
R2  
SAMPLING  
CIRCUIT  
OUT  
12V  
N:1  
C
BYP1  
9
12  
2
6
4
C
BYP2  
VS12  
DRVS  
N/C  
OHD  
VDD  
C
R1  
Q1  
11 DRV1  
ENABLE 10  
5
DCLIM  
UCC3752  
OFFHOOK  
1
Q2  
13 DRV2  
GND  
XTAL2 15  
XTAL1  
16  
PGND  
14  
FS0  
7
FS1  
8
3
3.579545MHz  
UDG-98058  
SLUS269 - JULY 1999  

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