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參數資料
| 型號： | FAN7532MX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Ballast Control IC |
| 中文描述： | 0.5 A FLUORESCENT LIGHT CONTROLLER, 52 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數： | 10/16頁 |
| 文件大小： | 214K |
| 代理商： | FAN7532MX |
FAN7532
10
Finally, the preheating frequency in the preheating period
using the FAN7532 is determined by the equation (10)
:
Protection Modes
The FAN7532 has two types of protection modes.
1) Over Voltage Protection (OVP) Mode
The OVP pin is normally connected to the external compo-
nents that detect lamp voltage between a lamp’s cathodes.
This voltage is always maintained under 2V in normal opera-
tion. If the lamp enters the end of lamp life or abnormal con-
dition, the lamp will not turn on even if there is enough
voltage supplied between two cathodes. Normally, this con-
dition means that one of the cathodes is broken, deactivated,
or the lamp is deeply blackened around the cathodes. In this
state, the ballast constantly generates very high voltage
between two cathodes to ignite according to a specific proce-
dure in the control IC. When the voltage of OVP pin exceeds
2V, the IC instantly enters the protection mode. To exit this
mode, the V
cc
must be recycled below the UVLO low
threshold.
t
run_ch
CT
Irun_ch
I
run
_disch
-------------------
×
=
(9)
t
run
_disch
CT
---------------------------
dVct
3.45V: constant
=
×
=
frun
+
2
trun_ch
trun_disch
(
)
×
--------------------------------------------------------------------
=
10
(
)
VCC
15.6V
V
CPH
5V
2.9V
FREQ
f
PH
f
OSC
V
LAMP
V
UVLO+
V
UVLO-
OVP
Ignition fail
Latched
shutdown
Preheating
Ignition
UVLO
Preheating
Ignition Run
Ignition fail level
Latched shutdown mode is removed
after VCC goes down to the UVLO-
Figure 15. Timing Diagram (OVP) Mode)
相關PDF資料 |
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| FAN7544 | Simple Ballast Controller |
| FAN7544M | Simple Ballast Controller |
| FAN7544MX | Simple Ballast Controller |
| FAN7544N | Terminal Block; RoHS Compliant:Yes RoHS Compliant: Yes |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN7535 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC & Ballast Control IC |
| FAN7535M | 功能描述:功率因數校正 IC Half-bridge Gate RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| FAN7535MX | 功能描述:開關變換器、穩壓器與控制器 Electronic Ballast PFC Combo IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN7544 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Simple Ballast Controller |
| FAN7544M | 功能描述:開關變換器、穩壓器與控制器 Electronic Ballast Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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