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參數(shù)資料
| 型號(hào)： | ML4835 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Compact Fluorescent Electronic Dimming Ballast Controller(小型熒光管整流器控制器) |
| 中文描述： | 緊湊型熒光燈電子調(diào)光鎮(zhèn)流器控制器（小型熒光管整流器控制器） |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大小： | 214K |
| 代理商： | ML4835 |
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ML4835
REV. 1.0 10/12/2000
7
Figure 3. ML4835 PFC Controller Section
FUNCTIONAL DESCRIPTION
(Continued)
The ML4835 implements a triple frequency operation
scheme: programmable three-frequency sequence for pre-
heat, ignition, and dimming, that extends lamp life,
simplifies lamp network design, and starts lamps at any
dimming level without flashing. This addresses the need
for a high-Q network for starting sequence and low-Q
network for operation, minimizing parasitic losses and
improving overall power efficiency. The values for the
pre-heat, start, operation, and restart can be programmed
or selected (Figure 2).
POWER FACTOR SECTION
The ML4835 power factor section is a peak or average
current sensing boost mode PFC control circuit in which
only voltage loop compensation is needed. It is simpler
than a conventional average current control method. It
consists of a voltage error amplifier, a current sense
amplifier (no compensation is needed), an integrator, a
comparator, and a logic control block. In the boost
topology, power factor correction is achieved by sensing
the output voltage and the current flowing through the
current sense resistor. Duty cycle control is achieved by
comparing the integrated voltage signal of the error
amplifier and the voltage across R
SENSE
. The duty cycle
control timing is shown in Figure 3.
+
–
–
+
LAMP
NETWORK
INVERTER
LAMP
LAMP
RA
SW2
L
SW1
R
SENSE
RB
V
OUT
EMI
FILTER
18
3
PIFB
PIFBO
C
RAMP
C1
C2
R1
C
RAMP
PFC OUT
PVFB/OVP
1
–A
S
VREF1
OSC
PIFBO
RAMP
CLK
PFC OUT
CLK
R
Q
V
TO
I
PEAO
13
PEAO
2
4
START
HIGH Q
LOW Q
OPERATION
PREHEAT
f3
f2
f1
ML4835
SET TIME VALUES
FOR PREHEAT,
START AND OPERATION,
AND RESTART
Figure 2. Three Frequency Design Model
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4836 | Compact Fluorescent Electronic Dimming Ballast Controller(小型熒光管整流器控制器) |
| ML4841 | Variable Feedforward PFC/PWM Controller Combo(前饋可變PFC/PWM控制器組合芯片) |
| ML4851 | Low Current, Voltage Boost Regulator(小電流升壓穩(wěn)壓器) |
| ML4854IT | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
| ML4854 | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4835CP | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML4835CS | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML4836 | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML4836CP | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML4836CS | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
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