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參數(shù)資料
| 型號： | UC1872 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Resonant Lamp Ballast Controller |
| 中文描述： | 諧振燈鎮(zhèn)流器控制器 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 190K |
| 代理商： | UC1872 |
UC1872
UC2872
UC3872
07/99
FEATURES
Controls Different Types of Lamps:
Cold Cathode Fluorescent, Neon, and
Gas Discharge
Zero Voltage Switching (ZVS) of
Push-Pull Drivers
Accurate Control of Lamp Current
Variable Lamp Intensity Control
1
μ
A Disable Current
4.5V to 24V Operation
Open Lamp Detection Circuitry
DESCRIPTION
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 1
μ
A when disabled.
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%.
Other features include a precision 1.2% reference, undervoltage lockout,
and accurate minimum and maximum frequency control.
Resonant Lamp Ballast Controller
4
6
5
3
2
12
13
1
14
7
8
+
–
0.5V
SYNC
OUT
SENSE
OSCILLATOR
GND
+
–
+
OPEN
LAMP
DETECT
+
–
+
–
UVLO
3.0V
REF
10
9
11
R
S
T
TOGGLE
50k
50k
50k
PUSH PULL
OUTPUTS
N-CHANNEL
VC
AOUT
BOUT
COUT
PGND
0.1V
PWM
1
0.2V
200
μ
A
ZERO DETECT
ZD
CT
SS
INV
COMP
ENBL
REF
VCC
1.5V
20
μ
A
(HIGH=ENABLE)
BUCK DRIVE
P-CHANNEL
EA
BLOCK DIAGRAM
UDG-99112
Note: Pin numbers shown are for DIP package.
application
INFO
available
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相關(guān)代理商/技術(shù)參數(shù) |
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| UC1872_09 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Resonant Lamp Ballast Controller |
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