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UCC3972PW Datasheet

  • UCC3972PW

  • Ballast/Backlight Controller/Driver

  • 18頁

  • ETC

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UCC1972/3
UCC2972/3
UCC3972/3
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
FEATURES
鈥?/div>
1mA Typical Supply Current
鈥?/div>
Accurate Lamp Current Control
鈥?/div>
Analog or Low Frequency Dimming
Capability
鈥?/div>
Open Lamp Protection
鈥?/div>
Programmable Startup Delay
鈥?/div>
4.5V to 25V Operation
鈥?/div>
PWM Frequency Synchronized to
External Resonant Tank
鈥?/div>
8 Pin TSSOP and SOIC Packages
Available
鈥?/div>
Internal Voltage Clamp Protects
Transformer from Over-voltage
(UCC3973)
DESCRIPTION
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.
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.
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.
C6 27pF
T1
TYPICAL APPLICATION CIRCUIT
UCC3972 NO INTERNAL VOLTAGE CLAMP
UCC3973
INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER
VOLTAGE AT START-UP OR DURING FAULT
SYSTEM VOLTAGE
(4.5V TO 25V)
R1
1k鈩?/div>
C1
6.8碌F
C2
1碌F
6
GND
BUCK
1
L1
68碌H
8
R2 1k
C5 0.1碌F
D1
R10
Q2
C7
0.1碌F
Q3
R11
LAMP
HV
UCC3972/3
VDD
VBAT
2
5
C3
1碌F
MODE
LAMP
LV
ANALOG
DIMMING
R5 10k
R3 68k
3
COMP
R6 75鈩?/div>
OUT
7
FB
4
LOW FREQUENCY DIMMING
D2
R4 750
C4 33nF
D
LFD
R
LFD
68k
0V-5V LOW FREQUENCY CONTROL SIGNAL
UDG-99154
SLUS252B - OCTOBER 1998 - REVISED NOVEMBER 2000

UCC3972PW 產(chǎn)品屬性

  • 150

  • 集成電路 (IC)

  • PMIC - 照明，鎮(zhèn)流器控制器

  • -

  • CCFL 控制器

  • 80 ~ 160 kHz

  • 7mA

  • 100mA

  • 4.5 V ~ 25 V

  • 0°C ~ 70°C

  • 8-TSSOP（0.173"，4.40mm 寬）

  • 8-TSSOP

  • 管件

  • 296-2257-5

UCC3972PW相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
    下載
  • 英文版
    LOW-DROPOUT 200-MA LIEAR REGULATOR
  • 英文版
    LOW-DROPOUT 200-mA LINEAR REGULATOR
    TI
  • 英文版
    LOW-DROPOUT 200-MA LIEAR REGULATOR
  • 英文版
    LOW-DROPOUT 200-MA LIEAR REGULATOR
  • 英文版
    5-Bit Programmable Output BiCMOS Precision Voltage Reference
    TI
  • 英文版
    5-Bit Programmable Output BiCMOS Precision Voltage Reference
  • 英文版
    HID Lamp Controller
    TI
  • 英文版
    HID Lamp Controller
    TI [Texas ...
  • 英文版
    Low Power Pulse Width Modulator
    TI
  • 英文版
    Low Power Pulse Width Modulator
    TI [Texas ...
  • 英文版
    Micropower Voltage Mode PWM
    TI
  • 英文版
    Micropower Voltage Mode PWM
    TI [Texas ...
  • 英文版
    Switch Mode Secondary Side Post Regulator
    TI
  • 英文版
    Switch Mode Secondary Side Post Regulator
    TI [Texas ...
  • 英文版
    Low Voltage Synchronous Buck Controller
    TI
  • 英文版
    Low Voltage Synchronous Buck Controller
    TI [Texas ...
  • 英文版
    5-Bit Programmable Output BiCMOS Power Supply Controller
    TI
  • 英文版
    5-Bit Programmable Output BiCMOS Power Supply Controller
    TI [Texas ...
  • 英文版
    Brushless DC Motor Controller
    TI
  • 英文版
    Brushless DC Motor Controller
    TI [Texas ...

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