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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 6/14頁(yè) |
| 文件大小： | 165K |
| 代理商： | ML4831 |
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ML4831
6
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 Pin 4. A cycle-by-cycle current limit is
included to protect the MOSFET from high speed current
transients. When the voltage at Pin 4 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 Pin 18 exceeds 2.75V, the PFC transistors are inhibited.
The ballast section will continue to operate. The OVP
threshold should be set to a level where the power
components are safe to operate, but not so low
as to interfere with the boost voltage regulation loop.
Figure 1. ML4831 Block Diagram
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 (<1
μ
F) 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)
–
+
18
2.5V
R1
C1
C2
Figure 2. Compensation Network
7
R(SET)
R(X)/C(X)
VCC
V
REF
GND
IA OUT
IA +
–V
MUL
+
10
16
17
11
2
4
OUT B
13
+
–
+
–
+
–
–
+
2.5V
V
REF
–1V
PREHEAT
TIMER
OSC
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
–
+
S
R
Q
T
Q
Q
P GND
12
OUT A
14
PFC OUT
15
R(T)/C(T)
8
INTERRUPT
9
LFB OUT
6
LAMP F.B.
5
7K
PWM (PFC)
7K
I(SINE)
EA OUT
EA –/OVP
3
1
18
–
+
2.5V
–
+
2.75V
OVP
GAIN
MODULATORS
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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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