參數(shù)資料
型號(hào)： UCC2975TRPW
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)： 21/28頁(yè)
文件大小： 433K
代理商： UCC2975TRPW
SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
21
www.ti.com
APPLICATION INFORMATION
analog dimming PZT performance
High efficiency can be achieved by selecting the best power topology while matching the lamp, input voltage
and PZT characteristics. Figure 17 shows the performance of a 3-W rated multi-layer PZT operating a 600 V
lamp using the push-pull topology at various input voltage and lamp current conditions. Electrical efficiency is
greater than 85% at lower input voltages, decreasing at higher input voltages as the PZT gain is reduced. This
circuit and lamp can operate from 2 Li-Ion cells with voltages between 5 V and 8.2 V. The same PZT and lamp
would require three Li
–
Ion cells for the half-bridge topology but would yield similar efficiency.
Dimming by linearly reducing lamp current causes the efficiency to degrade since the PZT is operated at less
than optimal gain (see 1.5 mA curve). Improved efficiency can be achieved by using burst mode dimming. This
dimming method involves running the lamp at full power, but controlling average lamp current by modulating
the on/off duty cycle at a frequency higher than the eye can detect (100 Hz, for example).
Figure 18 shows plots of PZT operating frequency over the same lamp conditions as Figure 17. As expected,
frequency decreases at higher lamp currents as the PZT characteristics shift to a lower operating frequency
when loaded (see Figure 2). Frequency increases linearly with input voltage, since the required V
OUT
/V
IN
gain
to operate the lamp is decreased.
Figure 17
TYPICAL PIEZO TRANSFORMER EFFICIENCY
vs
INPUT VOLTAGE
4
55
50
75
60
85
95
70
65
90
80
5
7
8
9
6
10
E
–
VIN
–
Input Voltage
–
Vdc
1.5 mA
660 V
4.5 mA
570 V
3.0 mA
610 V
Figure 18
f
–
–
PIEZO TRANSFORMER FREQUENCY
vs
INPUT VOLTAGE
4
60.5
60.0
62.5
61.0
63.5
64.5
62.0
61.5
64.0
63.0
65.0
5
7
8
9
6
10
VIN
–
Input Voltage
–
Vdc
4.5 mA
570 V
1.5 mA
570 V
3.0 mA
610 V
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