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參數(shù)資料
| 型號： | TB62757FUG |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1430 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 0.95 MM, PITCH, LEAD FREE, PLASTIC, SSOP-6 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 516K |
| 代理商： | TB62757FUG |
TB62757FUG
2006-02-206
6
Brightness Control Method
Recommended Brightness Control Circuits are 4 types.
1) Input PWM signal to SHDN terminal
IF can be adjusted with PWM signal by inputting it to SHDN terminal.
[Notice]
<<Minimum ON-time of PWM signal input>>
Set the minimum ON-time or OFF-time 33 s or more in inputting the PWM signal.
Set the Duty ratio satisfying the condition above.
Ex) In case PWM Frequency is 1 kHz,
1 kHz is 1 ms (PWM Width
= 100%) and it takes 10 s per 1%.
To set the pulse width 33
s or more, necessary ON-or-OFF-time is calculated below.
33
s ÷ 10 s = 3.3% (Under the condition that 10 s equals 1%.)
Finally, the Duty Ratio can be set in range of 3.3% to 96.7%.
<<PWM signal frequency>>
The recommended PWM signal frequency is from 100 Hz to 10 kHz. There is a possibility to arise
the audible frequency in mounting to the board because it is within the auditory area.
<<Constant number of external capacitor>>
To reduce the fluctuation of input current and increase the accuracy of brightness, the values that
C1 = 4.7 (F) or more, C2 = 0.1 (F) or less are recommended.
When the PWM signal is off, the time to drain C2 of charge depends on the constant number. And
so, the actual value is little different from the theoretical value.
<<PWM input signal>>
Set the amplitude of PWM signal within the range of SHDN terminal specification.
<<Rush current in inputting>>
In case dimming by inputting the PWM signal to the SHDN terminal, this IC turns on and off
repeatedly.
And the rush current, which provides the charge to C2, arises in turning on. Take care in selecting
the condenser.
<<Current value in control with PWM: Ideal equation>>
]
[
[%]
×
]
[
=
)
(
R
Duty
ON
mV
325
mA
I
SENS
F
1 ms (1 kHz)
= 100%
Set On-time
Set Off-time
33
s or more = 3.3%
Available Duty Ratio
(3.3% to 96.7%)
33
s or more = 3.3%
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