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參數(shù)資料
| 型號(hào)： | UCC1973 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | R8C Series, 20 Group, WDTO 48P6Q-A |
| 中文描述： | BiCMOS工藝?yán)潢帢O燈管驅(qū)動(dòng)器控制器 |
| 文件頁(yè)數(shù)： | 1/17頁(yè) |
| 文件大?。?/td> | 308K |
| 代理商： | UCC1973 |
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UCC1972/3
UCC2972/3
UCC3972/3
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.
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
FEATURES
1mA Typical Supply Current
Accurate Lamp Current Control
Analog or Low Frequency Dimming
Capability
Open Lamp Protection
Programmable Startup Delay
4.5V to 25V Operation
PWM Frequency Synchronized to
External Resonant Tank
8 Pin TSSOP and SOIC Packages
Available
Internal Voltage Clamp Protects
Transformer from Over-voltage
(UCC3973)
SLUS252A - JANUARY 2000
3
8
6
5
VBAT
4
2
1
7
VDD
GND
MODE
COMP
BUCK
OUT
FB
C7
0.1
μ
F
D1
R10
R11
Q3
C5 0.1
μ
F
L1
68
μ
H
R6 75
Q2
R2 1k
T1
C6 27pF
LAMP
HV
LAMP
LV
R3 68k
D2
R5 10k
R4 750
ANALOG
DIMMING
D
LFD
R
LFD
68k
0V-5V LOW FREQUENCY CONTROL SIGNAL
C4 33nF
LOW FREQUENCY DIMMING
C2
1
μ
F
R1
1k
C1
6.8
μ
F
SYSTEM VOLTAGE
(4.5V TO 25V)
C3
1
μ
F
UCC3972
UCC3973
NO INTERNAL VOLTAGE CLAMP
INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER
VOLTAGE AT START-UP OR DURING FAULT
UCC3972/3
TYPICAL APPLICATION CIRCUIT
UDG-99154
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