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參數(shù)資料
| 型號(hào)： | ML4832 |
| 廠(chǎng)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(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 151K |
| 代理商： | ML4832 |
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ML4832
8
REV. 1.0 10/12/2000
The magnitude of the offset voltage that will appear at
the input is given by V
OS
= io/gm. For an io of 1mA and a
gm of 0.05 μmhos the input referred offset will be 20mV.
Capacitor C1 as shown in Figure 2 is used to block the
DC current to minimize the adverse effect of offsets.
Slew rate enhancement is incorporated into all of the
operational transconductance amplifiers in the ML4832.
This improves the recovery of the circuit in response to
power up and transient conditions. The response to large
signals will be somewhat non-linear as the
transconductance amplifiers change from their low to
high transconductance mode. This is illustrated in
Figure 4.
BALLAST OUTPUT SECTION
The IC controls output power to the lamps via frequency
modulation with non-overlapping conduction. This
means that both ballast output drivers will be low during
the discharging time t
DIS
of the oscillator capacitor C
T
.
OSCILLATOR
The VCO frequency ranges are controlled by the output
of the LFB amplifier. As lamp current decreases, LFB
OUT rises in voltage, causing the C
T
charging current to
decrease, thereby causing the oscillator frequency to
decrease. Since the ballast output network attenuates
high frequencies, the power to the lamp will be
increased.
The oscillator frequency is determined by the following
equations:
F
t
t
OSC
CHG
DIS
=
+
1
(3)
and
t
R C In
V
V
I
I
R
R
V
V
CHG
REF
CH
T
TL
REF
CH
T
TH
=
+
+
F
I
(4)
The oscillator’s minimum frequency is set when I
CH
= 0
where:
F
R C
OSC
T
×
1
051
.
(5)
This assumes that t
CHG
>> t
DIS
.
When LFB OUT is high, I
CH
= 0 and the minimum
frequency occurs. The charging current varies according to
two control inputs to the oscillator:
1.
The output of the preheat timer
2.
The voltage at LFB OUT
In preheat condition, charging current is fixed at
I
R
CHG PREHEAT
(
SET
)
.
=
25
(6)
17
+
–
1.25/3.75
8
C
T
V
REF
I
CHG
V
REF
CONTROL
R
T
/C
T
R
T
5.5mA
CLOCK
C
T
V
TH
= 3.75V
V
TL
= 1.25V
t
DIS
t
CHG
Figure 5. Oscillator Block Diagram and Timing
FUNCTIONAL DESCRIPTION
(Continued)
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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(chēng):MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)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(chēng):MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833CS | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
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