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參數(shù)資料
| 型號(hào)： | UCC2977TRPW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Precision 500 mA regulators |
| 中文描述： | 鎮(zhèn)流器/背光控制器/驅(qū)動(dòng)器| TSSOP封裝| 8引腳|塑料 |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大?。?/td> | 433K |
| 代理商： | UCC2977TRPW |
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SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
13
www.ti.com
APPLICATION INFORMATION
+
–
RESONANT
POWER
STAGE
DC INPUT
VOLTAGE
VOLTAGE
CONTROLLED
OSCILLATOR
REF
CCFL
LAMP CURRENT
SENSE
ERROR
AMPLIFIER
PIEZOELECTRIC
TRANSFORMER
VC
UDG
–
01101
Figure 11. Control System for Variable Frequency PZT Backlight Control
programming the frequency range
The frequency range of the UCC397x family is programmed with external components R
OSC
, C
OSC
, and R
ANGE
(see Figures 2 and 3). The programmed range should include the strike and operating frequency required for
lamp operation, plus sufficient tolerance for component variations. An accurate NPO capacitor is recommended
for C
OSC
(between 100 pF and 1000 pF) while 1% resistors are recommended for R
OSC
and R
ANGE
. The VCO
frequency is determined by the charge and decay times between 0.7 V and 1.7 V at the OSC pin. When the
voltage reaches 0.7 V, an internal pull-up circuit charges OSC back to 1.7 V, the charge time (t
CHG
) varies with
the value of C
OSC
but is typically on the order of 500 ns. The decay time (t
DISCH
) is determined by the value
of C
OSC
and the discharge currents generated in R
OSC
and R
ANGE
. The nominal discharge time at OSC is set
by R
OSC
and C
OSC
(see equation [8]), the frequency range is programmed by adjusting the discharge time with
the R
ANGE
resistor and the COMP voltage (see equation [9]):
nominal
t
DISCH
R
OSC
C
OSC
ln1.7
0.7
with lamp
t
DISCH
V
COMP
R
OSC
R
ANGE
C
OSC
R
OSC
R
ANGE
ln
1.7 R
OSC
0.7 R
OSC
R
ANGE
R
ANGE
V
COMP
V
COMP
R
OSC
R
OSC
resulting frequency
Frequency V
COMP
1
t
CHG
t
DISCH
V
COMP
(8)
(9)
(10)
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