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參數(shù)資料
| 型號(hào)： | ML4819 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor and PWM Controller “Combo” |
| 中文描述： | 功率因數(shù)和PWM控制器“組合” |
| 文件頁(yè)數(shù)： | 6/15頁(yè) |
| 文件大小： | 269K |
| 代理商： | ML4819 |
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ML4819
6
REV. 1.0 10/10/2000
ERROR AMPLIFIER
The ML4819 error amplifier is a high open loop gain, wide
bandwidth amplifier.
GAIN MODULATOR
The ML4819 gain modulator is a linear current input
multiplier to provide high immunity to the disturbances
caused by high power switching. The rectified line input
sine wave is converted to a current via a dropping resistor.
In this way, small amounts of ground noise produce an
insignificant effect on the reference to the PWM
comparator.
The output of the gain modulator is a current of the form:
I
OUT
is proportional to I
SINE
×
I
EA
where I
SINE
is the current in the dropping resistor, and I
EA
is a current proportional to the output of the error
amplifier. When the error amplifier is saturated high, the
output of the gain modulator is approximately equal to
the I
SINE
input current.
The gain modulator output current is converted into the
reference voltage for the PWM comparator through a
resistor to ground on the gain modulator output. The gain
modulator output is clamped to 5V to provide current
limiting.
100pF
200pF
500pF
1nF
2nF
5nF
10nF
50
V
CC
= 15V
T
A
= 25 C
R
T
,
)
20
10
8
5
3
30
50
f
OSC
, OSCILLATOR FREQUENCY (kHz)
MAX DUTY CYCLE
100
200
300
500
85%
90%
95%
30
20
SOURCE SATURATION
(LOAD TO GROUND)
V
CC
T
A
= 25 C
T
A
= 25 C
V
CC
= 15V
80
μ
s PULSED LOAD
120 Hz RATE
SINK SATURATION
(LOAD TO V
CC
)
GND
0
–
1.0
–
2.0
3.0
2.0
1.0
0
0
200
400
600
800
I
O
, OUTPUT LOAD CURRENT (mA)
V
S
,
Figure 2. Oscillator Timing Resistance vs. Frequency
Figure 3. Output Saturation Voltage vs. Output Current
+5V
INV
4
3
–
+
+8V
0.5mA
EA OUT
Figure 4. Error Amplifier Configuration
V
CC
= 15V
V
O
= 1.0V TO 5.0V
R
L
= 100k
T
A
= 25 C
GAIN
PHASE
100
80
60
40
20
0
–
20
10
100
1.0k
10k
100k
1.0M
10M
0
–
30
60
90
120
150
180
f, FREQUENCY (Hz)
A
V
,
φ
,
Figure 5. Error Amplifier Open-Loop Gain and
Phase vs Frequency
Figure 6. Gain Modulator Block Diagram
6
3
I
SINE
MULTIPLIER
ERROR
VOLTAGE
9V
GAIN MODULATOR
I
SINE
I
ERR
I
ERR
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