UC3872

更新时间： 2024-11-28 22:39:59

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
7页	192K
描述
Resonant Lamp Ballast Controller

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替代型号

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UC3872 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

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UC3872 替代型号

型号	品牌	替代类型	描述	数据表
UC2872	TI	功能相似	Resonant Lamp Ballast Controller

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UC3872DW	TI	获取价格	Resonant Lamp Ballast Controller
UC3872DWG4	TI	获取价格	Resonant Lamp Ballast Controller
UC3872DWTR	TI	获取价格	Resonant Lamp Ballast Controller
UC3872DWTRG4	TI	获取价格	Resonant Lamp Ballast Controller
UC3872M	TI	获取价格	Resonant Lamp Ballast Controller
UC3872MG4	TI	获取价格	Resonant Lamp Ballast Controller
UC3872MTR	TI	获取价格	Resonant Lamp Ballast Controller
UC3872MTRG4	TI	获取价格	Resonant Lamp Ballast Controller
UC3872N	TI	获取价格	Resonant Lamp Ballast Controller
UC3872NG4	TI	获取价格	Resonant Lamp Ballast Controller