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參數(shù)資料
| 型號： | ML4836 |
| 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） |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 150K |
| 代理商： | ML4836 |
ML4836
10
REV. 1.0 10/12/2000
Figure 9. Lamp Preheat and Interrupt Timers
FUNCTIONAL DESCRIPTION
(Continued)
R
X
C
X
HEAT
INHIBIT
0.625
R
SET
LEA_ENB OR
DIMMING LOCKOUT
INTERRUPT
10
R
X
/C
X
S
R
Q
1.75/4.65
+
–
1.0/1.20
+
–
1.25/6.65
+
–
9
In this condition, the minimum operating frequency of the
ballast is set per equation 5 above.
For the IC to be used effectively in dimming ballasts with
higher Q output networks a larger C
T
value and lower R
T
value can be used, to yield a smaller frequency excursion
over the control range (voltage at LFB OUT). The discharge
current is set to 7.5mA. The operation of the oscillator is
hown in Figure 7.
Assuming that I
DIS
>>I
RT
:
t
C
DIS VCO
(
T
)
×
600
(9)
IC BIAS, UNDER-VOLTAGE LOCKOUT AND
THERMAL SHUTDOWN
The IC includes a shunt clamp which will limit the voltage
at V
CC
to 14.5V (V
CCZ
). The IC should be fed with
a current limited source, typically derived from the ballast
transformer auxiliary winding. When V
CC
is below
V
CCZ
– 1.1V, the IC draws less than 0.55mA of quiescent
current and the outputs are off. This allows the IC to start
using a “bleed resistor” from the rectified AC line. The ICC
start-up condition is shown in Figure 7. To help reduce
ballast cost, the ML4836 includes a temperature sensor
which will inhibit ballast operation if the IC’s junction
temperature exceeds 140°C. In order to use this sensor in
lieu of an external sensor, care should be taken when
placing the IC to ensure that it is sensing temperature at
the physically appropriate point in the ballast. The
ML4836’s die temperature can be estimated with the
following equation:
T
T
P
(
C W
/
J
A
D
+
+
°
)
65
(10)
STARTING, RE-START, PREHEAT AND INTERRUPT
The lamp starting scenario implemented in the ML4836
is designed to maximize lamp life and minimize ballast
heating during lamp out conditions.
The circuit in Figure 9 controls the lamp starting scenarios:
Filament preheat and lamp out interrupt. C
X
is charged
with a current of I
R(SET)
/4 and discharged through R
X
. The
voltage at C
X
is initialized to 0.7V (V
BE
) at power up. The
time for C
X
to rise to 4.65V is the filament preheat time.
During that time, the oscillator charging current (I
CHG
) is
2.5/R
SET
. This will produce a high frequency for filament
preheat, but will not produce sufficient voltage to ignite
the lamp or cause significant glow current.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4836CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML4836CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Compact Fluorescent Electronic Dimming Ballast Controller |
| ML483-G | 功能描述:射頻混合器 .7-1.0GHz 5Volts RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ML483-PCB | 功能描述:射頻混合器 .7-1.0GHz 5Volts Eval Brd RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ML483PYA | 制造商:COILCRAFT 制造商全稱:Coilcraft lnc. 功能描述:High Reliability Power Inductors |
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