Datasheet > UC3872QTR

UC3872QTR

更新时间： 2024-11-01 23:38:59

品牌	Logo	应用领域
其他 - ETC		控制器
页数	文件大小	规格书
7页	217K
描述
Power Factor Controller

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中文翻译

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数据手册

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UC3872QTR 数据手册

application

INFO

UC1872

UC2872

UC3872

available

Resonant Lamp Ballast Controller

FEATURES

DESCRIPTION

• Controls Different Types of Lamps:

Cold Cathode Fluorescent, Neon, and

Gas Discharge

The UC3872 is a resonant lamp ballast controller optimized for driving

cold cathode fluorescent, neon, and other gas discharge lamps. The res-

onant power stage develops a sinusoidal lamp drive voltage, and mini-

mizes switching loss and EMI generation. Lamp intensity adjustment is

accomplished with a buck regulator, which is synchronized to the external

power stage’s resonant frequency. Suitable for automotive and battery

powered applications, the UC3872 draws only 1µA when disabled.

• Zero Voltage Switching (ZVS) of

Push-Pull Drivers

• Accurate Control of Lamp Current

• Variable Lamp Intensity Control

• 1µA Disable Current

Soft start and open lamp detect circuitry have been incorporated to mini-

mize component stresses. Open lamp detection is enabled at the comple-

tion of a soft start cycle. The chip is optimized for smooth duty cycle

control to 100%.

• 4.5V to 24V Operation

Other features include a precision 1.2% reference, undervoltage lockout,

and accurate minimum and maximum frequency control.

• Open Lamp Detection Circuitry

BLOCK DIAGRAM

3.0V

REF

AOUT

VCC 10

UVLO

50k

REF

(HIGH=ENABLE)

PUSH PULL

OUTPUTS

ENBL 11

N-CHANNEL

0.1V

–

COMP

INV

TOGGLE

OPEN

LAMP

DETECT

–

BOUT

20µA

50k

1.5V

PWM

–

200µA

0.2V

OSCILLATOR

SENSE

OUT

12 COUT

ZERO DETECT

BUCK DRIVE

P-CHANNEL

–

SYNC

0.5V

13 PGND

GND

UDG-99112

Note: Pin numbers shown are for DIP package.

07/99

12 3 4 5 6 7

中文翻译

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