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參數(shù)資料
| 型號： | ML4831 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Electronic Ballast Controller(電子整流器控制器) |
| 中文描述： | 電子鎮(zhèn)流器控制器（電子整流器控制器） |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 165K |
| 代理商： | ML4831 |
ML4831
7
Figure 3 shows the output configuration for the
operational transconductance amplifiers.
CURRENT
MIRROR
IN
OUT
CURRENT
MIRROR
IN
OUT
gmV
IN
2
io = gmV
IN
IQ +
gmV
IN
2
IQ –
Figure 3. Output Configuration
A DC path to ground or VCC at the output of the
transconductance amplifiers will introduce an offset error.
The magnitude of the offset voltage that will appear at the
input is given by V
OS
= io/gm. For a io of 1uA and a gm
of 0.08
μ
mhos the input referred offset will be 12.5mV.
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 ML4831.
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.
V
IN
Differential
Linear Slope Region
0
i
O
Figure 4. Transconductance Amplifier Characteristics
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 (Pin 6). As lamp current decreases, Pin 6
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.
17
+
–
1.25/3.75
8
C(T)
V
REF
I
CHG
V
REF
CONTROL
R(T)/C(T)
R(T)
5 mA
CLOCK
C(T)
V
TH
= 3.75V
V
TL
= 1.25V
t
DIS
t
CHG
Figure 5. Oscillator Block Diagram and Timing
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
=
+
+
(4)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML483-1 | 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR 136KG 4" SWIVEL/BRAK 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 136KG, 4", SWIVEL/BRAKE, PLASTIC 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 136KG, 4", SWIVEL/BRAKE, PLASTIC, For Use With:Industrial and Material Handling Applications, Carrying Capacity:136kg, Wheel Diameter:100mm , RoHS Compliant: NA |
| ML4831CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML483-1W | 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR 136KG 4" SWIVEL/BRAK 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 136KG, 4", SWIVEL/BRAKE, PLASTIC 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 136KG, 4", SWIVEL/BRAKE, PLASTIC, For Use With:Industrial and Material Handling Applications, Carrying Capacity:136kg, Wheel Diameter:100mm , RoHS Compliant: NA |
| ML4832 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4832CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
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