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參數(shù)資料
| 型號(hào)： | UCC2752 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TOOLS,KITS,ELECTRONIC,NETWORK KIT, 22 PCS,COMPUTER ACCESSORIES,NETWORK MAINTENANCE KIT ,SPC TECHNOLOGY RoHS Compliant: NA |
| 中文描述： | 諧振環(huán)發(fā)電機(jī)控制器 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 72K |
| 代理商： | UCC2752 |
UCC2752
UCC3752
PRELIMINARY
DESCRIPTION
The UCC3752 controller is designed for driving a power stage that gener-
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.
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.
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.
Resonant Ring Generator Controller
FEATURES
Novel Topology for Low-Cost, Efficient
Generation of Ring Voltage
Suitable for Multi-Line Operation
Selectable 20, 25 and 50 Hz Ring
Frequency
Secondary (AC) Current Limiting
Generates an Off-Hook Detect Signal
Primary Current Limiting to Turn
Power Stage Off Under Fault
Conditions
Operates from a Single 12V Supply
SLUS269 - JULY 1999
1
10
15
4
ENABLE
VDD
OFFHOOK
XTAL2
6
OHD
2
N/C
12
DRVS
9
VS12
5
11
13
DRV1
DCLIM
DRV2
16
XTAL1
8
FS1
7
FS0
14
PGND
3
GND
C
BYP2
SAMPLING
CIRCUIT
C
F
AC SIGNAL
V
OUT
V
1
C
R2
12V
C
DC
DC SIGNAL
Q1
L
IN
V
IN
12V
T1
L
R
L
R
N:1
Q2
D1
C
BYP1
R
SENSE
C
R1
3.579545MHz
UCC3752
TYPICAL APPLICATION
UDG-98058
The circuits described in this datasheet are covered under US Patent #5,663,878 and other patents pending.
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