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參數(shù)資料
| 型號： | ML4832 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Electronic Dimming Ballast Controller(電子調(diào)光整流器控制器) |
| 中文描述： | 電子調(diào)光鎮(zhèn)流器控制器（電子調(diào)光整流器控制器） |
| 文件頁數(shù)： | 7/15頁 |
| 文件大小： | 151K |
| 代理商： | ML4832 |
ML4832
REV. 1.0 10/12/2000
7
AVERAGE CURRENT AND OUTPUT VOLTAGE
REGULATION
The PWM regulator in the PFC control section will act to
offset the positive voltage caused by the multiplier output
by producing an offsetting negative voltage on the current
sense resistor at IA+. A cycle-by-cycle current limit is
included to protect the MOSFET from high speed current
transients. When the voltage at IA+ goes negative by more
than 1V, the PWM cycle is terminated.
For more information on compensating the average
current and boost voltage error amplifier loops, see
ML4821 data sheet.
OVERVOLTAGE PROTECTION AND INHIBIT
The OVP pin serves to protect the power circuit from
being subjected to excessive voltages if the load should
change suddenly (lamp removal). A divider from the high
voltage DC bus sets the OVP trip level. When the voltage
on EA–/OVP exceeds 2.75V, the PFC transistors are
inhibited. The ballast section will continue to operate.
TRANSCONDUCTANCE AMPLIFIERS
The PFC voltage feedback, PFC current sense, and the
loop current amplifiers are all implemented as operational
transconductance amplifiers. They are designed to have
low small signal forward transconductance such that a
large value of load resistor (R1) and a low value ceramic
capacitor (<1μF) can be used for AC coupling (C1) in the
frequency compensation network. The compensation
network shown in Figure 2 will introduce a zero and a
pole at:
f
R C
f
R C
Z
P
=
=
1
2
1
2
π
π
(2)
Figure 3 shows the output configuration for the operational
transconductance amplifiers.
A DC path to ground or V
CC
at the output of the
transconductance amplifiers will introduce an offset error.
–
+
18
2.5V
R1
C1
C2
Figure 2. Compensation Network
CURRENT
MIRROR
IN
OUT
CURRENT
MIRROR
IN
OUT
gmV
IN
2
io = gmV
IN
IQ +
gmV
IN
2
IQ –
V
IN
Differential
Linear Slope Region
0
i
O
Figure 3. Output Configuration
Figure 4. Transconductance Amplifier Characteristics
FUNCTIONAL DESCRIPTION
(Continued)
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| ML4841 | Variable Feedforward PFC/PWM Controller Combo(前饋可變PFC/PWM控制器組合芯片) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4832CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4832CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:帶功率因數(shù)校正的調(diào)光電子鎮(zhèn)流器控制器ML4833 |
| ML4833CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
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