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參數(shù)資料
| 型號： | ML4830 |
| 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)： | 7/15頁 |
| 文件大?。?/td> | 134K |
| 代理商： | ML4830 |
ML4830
REV. 1.0 10/12/2000
7
Mode
Pin 8
Definition
VCO
GND
Frequency Modulation
VCO-O
OPEN
Overlapping VCO F.M.
PWM
VREF
Pulse Width Modulation
Table 1. ML4830 Operating Modes
OSCILLATOR
In Table 1 above, the two 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.
In PWM Mode, I
CHG
is 0 so the oscillator’s frequency is
set per (1) below.
18
+
–
1.25/3.75
9
C(T)
R(T)
V
REF
I
CHG
V
REF
CONTROL
R(T)/C(T)
5 mA
CLOCK
C(T)
V
TH
V
TL
t
DIS
t
CHG
Figure 2. Oscillator Block Diagram and Timing
Also, in both VCO modes, the when LFB OUT is high,
I
CHG
= 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 Pin 6 (lamp current output)
In preheat condition, charging current is fixed at
I
R SET
(
CHG PREHEAT
(
)
.
)
=
2 5
(1)
In running mode, charging current decreases as the V
PIN7
rises from 0V to V
OH
of trhe LAMP FB amplifier. The
highest frequency will be attained when I
CHG
is highest,
which is attained when V
PIN6
is at 0V:
I
R SET
(
CHG( )
)
0
5
=
(2)
The oscillator frequency is determined by the following
equations:
F
t
t
OSC
CHG
DIS
=
+
1
(3)
and
t
R C In
I
I
R
R
CHG
CHG
T
CHG
T
=
+
+
6 25
3 75
.
.
(4)
The oscillator’s minimum frequency is set when I
CHG
= 0
where:
F
R C
OSC
T
×
1
0 51
.
(5)
This assumes that t
CHG
>> t
DIS
.
Highest lamp power, and lowest output frequency are
attained when V
PIN6
is at its maximum output voltage
(V
OH
).
In this condition, the minimum operating frequency of the
ballast is set per (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 (V
PIN6
). The discharge current is set
to 5mA. Assuming that I
DIS
>> I
RT
:
t
C
DIS VCO
(
T
)
×
490
(6)
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