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UCC1973N PDF预览

UCC1973N

更新时间: 2024-11-28 21:14:11
品牌 Logo 应用领域
德州仪器 - TI 驱动信息通信管理光电二极管
页数 文件大小 规格书
18页 305K
描述
IC,BALLAST/BACKLIGHT CONTROLLER/DRIVER,BICMOS,DIP,8PIN,PLASTIC

UCC1973N 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
包装说明:DIP, DIP8,.3Reach Compliance Code:not_compliant
风险等级:5.92JESD-30 代码:R-PDIP-T8
端子数量:8最高工作温度:125 °C
最低工作温度:-55 °C封装主体材料:PLASTIC/EPOXY
封装代码:DIP封装等效代码:DIP8,.3
封装形状:RECTANGULAR封装形式:IN-LINE
电源:12 V认证状态:Not Qualified
子类别:Switching Regulator or Controllers标称供电电压 (Vsup):12 V
表面贴装:NO技术:BICMOS
温度等级:MILITARY端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
Base Number Matches:1

UCC1973N 数据手册

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UCC1972/3  
UCC2972/3  
UCC3972/3  
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller  
FEATURES  
DESCRIPTION  
1mA Typical Supply Current  
Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used  
in a notebook computer or portable application include small size, high effi-  
ciency, and low cost. The UCC3972/3 CCFL controllers provide the neces-  
sary circuit blocks to implement a highly efficient CCFL backlight power  
supply in a small footprint 8 pin TSSOP package. The BiCMOS controllers  
typically consume less than 1mA of operating current, improving overall  
system efficiency when compared to bipolar controllers requiring 5mA to  
10mA of operating current.  
Accurate Lamp Current Control  
Analog or Low Frequency Dimming  
Capability  
Open Lamp Protection  
Programmable Startup Delay  
4.5V to 25V Operation  
External parts count is minimized and system cost is reduced by integrat-  
ing such features as a feedback controlled PWM driver stage, open lamp  
protection, startup delay and synchronization circuitry between the buck  
and push-pull stages. The UCC3972/3 include an internal shunt regulator,  
allowing the part to operate with input voltages from 4.5V up to 25V. The  
part supports both analog and externally generated low frequency dimming  
modes of operation.  
PWM Frequency Synchronized to  
External Resonant Tank  
8 Pin TSSOP and SOIC Packages  
Available  
Internal Voltage Clamp Protects  
Transformer from Over-voltage  
(UCC3973)  
The UCC3973 adds a programmable voltage clamp at the BUCK pin. This  
feature can be used to protect the transformer from overvoltage during  
startup or when an open lamp occurs. Transformer voltage is controlled by  
reducing duty cycle when an over-voltage is detected.  
TYPICAL APPLICATION CIRCUIT  
C6 27pF  
UCC3972 NO INTERNAL VOLTAGE CLAMP  
INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER  
T1  
UCC3973  
VOLTAGE AT START-UP OR DURING FAULT  
SYSTEM VOLTAGE  
(4.5V TO 25V)  
R2 1k  
C5 0.1µF  
R1  
1kΩ  
UCC3972/3  
VDD  
D1  
R10  
R11  
8
C1  
6.8µF  
Q2  
VBAT  
2
1
C2  
1µF  
LAMP  
HV  
C7  
0.1µF  
Q3  
6
5
3
GND  
L1  
68µH  
LAMP  
LV  
BUCK  
MODE  
COMP  
ANALOG  
DIMMING  
C3  
1µF  
R6 75Ω  
OUT  
FB  
7
4
R5 10k  
R4 750  
R3 68k  
LOW FREQUENCY DIMMING  
68k  
D2  
C4 33nF  
D
R
LFD  
LFD  
0V-5V LOW FREQUENCY CONTROL SIGNAL  
UDG-99154  
SLUS252B - OCTOBER 1998 - REVISED NOVEMBER 2000  

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