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參數(shù)資料
| 型號(hào)： | FAN7311 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | LCD Backlight Inverter Drive IC |
| 中文描述： | 液晶背光逆變器驅(qū)動(dòng)IC |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 461K |
| 代理商： | FAN7311 |
7
www.fairchildsemi.com
FAN7311 Rev. 1.0.0
F
Function Description
UVLO
: The under voltage lockout circuit guarantees stable
operation of the IC’s control circuit by stopping and starting it as
a function of the Vin value. The UVLO circuit turns on the con-
trol circuit when Vin exceeds 5V. When Vin is lower than 5V, the
IC’s standby current is less than 200uA.
ENA:
Applying voltage higher than 2V to the ENA pin enables
the operation of the IC. Applying voltage lower than 0.7V to the
ENA pin will disable the operation of the inverter.
Soft start
: The soft start function requires that the S_S pin is
connected through a capacitor to GND. A soft start circuit
ensures a gradual increase in the input and output power. The
capacitor connected to the S_S pin determines the rate at which
the duty ratio rises. It is charged by a 6uA current source.
Main oscillator
: The timing capacitors (CTs) are charged by the
reference current source, which is formed by the timing resistor
(RT). The timing resistor’s voltage is regulated at 1.25V. The
sawtooth waveform charges up to 2V. Once this voltage is
reached, the capacitors begin discharging down to 0.5V. Next,
the timing capacitors start charging again and a new switching
cycle begins. The main frequency can be programmed by
adjusting the Rt and CT values. The main frequency can be cal-
culated as shown below.
Burst oscillator & burst dimming: The
timing capacitors
(BCTs) are charged by the reference current source, which is
formed by the timing resistor (RT). The timing resistor’s voltage
is regulated at 1.25V. The sawtooth waveform charges up to 2V.
Once this voltage is reached, the capacitors begin discharging
down to 0.5V. Next the timing capacitors start charging again
and a new switching cycle begins. The burst dimming frequency
can be programmed by adjusting the Rt and BCT values. The
burst dimming frequency can be calculated as shown below.
To avoid visible flicker, the burst dimming frequency should be
greater than 120Hz.
What does the following sentence mean Please rewrite.To
compare the input of BDIM pin with the 0.5~2V triangular wave
of burst oscillator makes the PWM pulse for burst dimming. The
PWM pulse controls EA_OUT’s voltage by summing 85uA into
the EA_IN pin.
fop
32 RT CT
-----------19
fburst
64 RT BCT
------------3.75
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN7311_07 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:LCD Backlight Inverter Drive IC |
| FAN7311_0712 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:LCD Backlight Inverter Drive IC |
| FAN7311AG | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN7311AGX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN7311B | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:LCD Backlight Inverter Drive IC |
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