Datasheet > UCC3752D

UCC3752D

更新时间： 2024-11-19 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

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中文翻译

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UCC3752D 数据手册

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

SENSE

DC SIGNAL

AC SIGNAL

12V

SAMPLING

CIRCUIT

OUT

12V

N:1

BYP1

BYP2

VS12

DRVS

N/C

OHD

VDD

11 DRV1

ENABLE 10

DCLIM

UCC3752

OFFHOOK

13 DRV2

GND

XTAL2 15

XTAL1

PGND

FS0

FS1

3.579545MHz

UDG-98058

SLUS269 - JULY 1999

12 3 4 5 6

中文翻译

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