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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)： | 8/17頁(yè) |
| 文件大小： | 214K |
| 代理商： | ML4835 |
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ML4835
8
REV. 1.0 10/12/2000
Setting minimum input voltage for output regulation can
be achieved by selecting C
RAMP
as follows for peak
current mode:
C
PEAO
K
D Ts
)
t
P
V
V
V
L
D Ts
)
R
RAMP
MAX
OUT
IN
OUT
IN
SENSE
=
2
F
H
I
K
L
N
O
Q
×
22
1
(
1
2
2
1
(
8
k
p
(1)
And for average current mode:
C
PEAO
K
D Ts
)
t
P
V
V
L
D Ts
)
R
RAMP
MAX
OUT
IN
OUT
2
SENSE
=
F
I
L
N
O
Q
×
22
1
(
1
2
1
(
8
k
p
(1a)
Where
t is the dead time.
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 PVFB/OVP exceeds 2.75V, the PFC transistor are
inhibited. The ballast section will continue to operate.
TRANSCONDUCTANCE AMPLIFIERS
The PFC voltage feedback amplifier is implemented as an
operational transconductance amplifier. It is 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
FUNCTIONAL DESCRIPTION
(Continued)
Figure 5. Compensation Network
Figure 6. Output Configuration
Figure 7. Transconductance Amplifier Characteristics
–
+
1
2.5V
PVFB/OVP
R1
C1
C2
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 4. Simplified Model of ML4835 EOL Functionality
ML4835
POWER LEVEL
TRIP POINT
POWER DETECT
POWER SHUTOFF
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 |
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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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