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參數(shù)資料
| 型號： | IRS2166DSTRPBF |
| 廠商： | International Rectifier |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | PFC + BALLAST CONTROL IC |
| 中文描述： | PFC的鎮(zhèn)流器控制IC |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 513K |
| 代理商： | IRS2166DSTRPBF |
IRS2166D(S)PbF
www.irf.com
Page 14
Fig. 14:
External over-current protection circuit
Should high currents occur, the voltage across the
current-sensing resistor will exceed the 4.3 V over-
voltage protection threshold at the VBUS pin and the PFC
MOSFET will turn off safely limiting the current. The
watch-dog timer will then restart the PFC as normal (Fig.
15). The current sensing resistor value should be
selected such that the over-current protection does not
false trip during normal operation over the entire line
voltage range and load range. A current-sensing resistor
value, for example, of 1.0 W will set the over-current
protection threshold to about 5 A peak.
Fig. 15:
PFC inductor current limited using over-current
protection circuit (upper trace: DC Bus, 100 V/div; middle
trace: AC line input voltage, 100 V/ div; lower trace: PFC
inductor current 1 A/div).
The effect that these line and load conditions have on the
performance of the ballast depends on the saturation
level of the PFC inductor, the selection of the PFC
MOSFET, the DC bus capacitor value, the maximum on-
time limit set by DZCOMP, and, how fast V
CC
decreases
below UVLO- when the DC bus drops during ignition (the
3 V reset on the VBUS pin does not become active until
RUN mode).
For these reasons, the ballast designer should perform
these mains interrupt and ignition tests carefully to
determine the robustness of their final design and to
decide if this additional over-current protection circuit is
necessary.
Ballast Design Equations
Note: The results from the following design equations can
differ slightly from experimental measurements due to IC
tolerances, component tolerances, and oscillator over-
and under-shoot due to internal comparator response
time.
Step 1: Program Deadtime
The deadtime between the gate driver outputs HO and
LO is programmed with timing capacitor C
T
and an
internal deadtime resistor R
DT
. The deadtime is the
discharge time of capacitor C
T
from 3/5 V
CC
to 1/3 V
CC
and is given as:
1475
=
T
DT
C
t
[s] (1)
or
1475
DT
T
t
C
=
[F] (2)
Step 2: Program Run Frequency
The final run frequency is programmed with timing
resistor R
T
and timing capacitor C
T
. The charge time of
capacitor C
T
from 1/3 V
CC
to 3/5 V
CC
determines the on-
time of HO and LO gate driver outputs. The run frequency
is therefore given as:
1
T
R
C
or
1
RUN
T
f
C
)
1475
51
.
2
+
=
T
RUN
f
[Hz] (3)
2892
02
.
=
T
R
[
] (4)
Step 3: Program Preheat Frequency
The preheat frequency is programmed with timing
resistors R
T
and R
PH
, and timing capacitor C
T
. The timing
resistors are connected in parallel internally for the
duration of the preheat time. The preheat frequency is
therefore given as:
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| IRS21681DSPBF | 制造商:International Rectifier 功能描述:ADVANCED PFC AND BALLAST CONTROL IC - Rail/Tube 制造商:International Rectifier 功能描述:IC LIGHT BALLAST CONTROL |
| IRS21681DSTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Advanced PFC & Ballast Cntrl 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IRS2168DPBF | 功能描述:功率驅(qū)動器IC Advanced PFC & Ballast Cntrl IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IRS2168DSPBF | 功能描述:功率驅(qū)動器IC ADVANCED PFC BALLAST CTRL IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IRS2168DSPBF | 制造商:International Rectifier 功能描述:MOSFET Driver IC |
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