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參數(shù)資料
| 型號(hào)： | UCC3976TRPW |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low consumption voltage and current controller for battery chargers and adaptors |
| 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 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 433K |
| 代理商： | UCC3976TRPW |
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SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
14
www.ti.com
APPLICATION INFORMATION
Equations 8 and 9 are derived by solving Laplace or differential equations for the RC decay time from 1.7 V to
0.7 V with and without the effect of V
COMP
. The resulting frequency of the system is given in equation 10. This
frequency should be verified in the lab and may need adjustment depending on factors such as extra
capacitance at the OSC pin (oscilloscope measurements can affect frequency) as well as noise. Figure 12
shows the resulting frequency-to-control voltage relationship with the component values listed below the figure
and a t
CHG
time of 500 ns.
Figure 12
f
–
–
ERROR AMPLIFIER VOLTAGE
vs
OSCILLATOR FREQUENCY
VCOMP
–
Error Amplifier Voltage
–
V
0
0.5
1.0
1.5
2.0
2.5
62
60
70
64
74
80
76
68
66
78
72
ROSC = 15.8 k
COSC = 560 pF
RANGE = 162 k
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