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UCC3752D Datasheet

  • UCC3752D

  • TELEPHONE RINGER|BICMOS|SOP|16PIN|PLASTIC

  • 7頁

  • ETC

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UCC2752
UCC3752
Resonant Ring Generator Controller
FEATURES
DESCRIPTION
鈥?/div>
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
鈥?/div>
Suitable for Multi-Line Operation
5 line applications where low cost, high efficiency and minimum parts count
鈥?/div>
Selectable 20, 25 and 50 Hz Ring
are critical. A semi-regulated DC voltage is added as an offset to the ring-
Frequency
ing signal. The ring generator operation is non-isolated and open loop.
鈥?/div>
Secondary (AC) Current Limiting
Generates an Off-Hook Detect Signal
鈥?/div>
Primary Current Limiting to Turn
Power Stage Off Under Fault
Conditions
鈥?/div>
Operates from a Single 12V Supply
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.
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
V
IN
12V
L
R
C
R2
SAMPLING
CIRCUIT
12V
N:1
C
R1
Q1
11
C
BYP1
AC SIGNAL
C
F
V
OUT
C
DC
DC SIGNAL
V
1
L
R
9
VS12
DRV1
12
DRVS
2
N/C
6
OHD
4
VDD
C
BYP2
5
DCLIM
UCC3752
ENABLE
10
OFFHOOK
1
Q2
13
DRV2
GND
3
PGND
14
FS0
7
FS1
8
XTAL2
XTAL1
16
15
3.579545MHz
UDG-98058
JULY 1999 - REVISED AUGUST 2000 - SLUS269A

UCC3752D 產(chǎn)品屬性

  • 40

  • 集成電路 (IC)

  • 接口 - 電信

  • -

  • 鈴聲發(fā)生器控制器

  • -

  • 1

  • 12V

  • 500µA

  • -

  • -40°C ~ 125°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC N

  • 管件

  • 主電流限制，次（AC）電流限制

  • 296-2607-5

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