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ML4819 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. ML4819
Description  Power Factor and PWM Controller “Combo”
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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ML4819 Datasheet(HTML) 6 Page - Fairchild Semiconductor

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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:
IOUT is proportional to ISINE × IEA
where ISINE is the current in the dropping resistor, and IEA
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 ISINE 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
VCC = 15V
TA = 25 C
20
10
8
5
3
30
50
100
200
300
500
85%
90%
95%
30
20
fOSC, OSCILLATOR FREQUENCY (kHz)
MAX DUTY CYCLE
SOURCE SATURATION
(LOAD TO GROUND)
VCC
TA = 25 C
TA = 25 C
VCC = 15V
80
µs PULSED LOAD
120 Hz RATE
SINK SATURATION
(LOAD TO VCC)
GND
0
–1.0
–2.0
3.0
2.0
1.0
0
0
200
400
600
800
IO, OUTPUT LOAD CURRENT (mA)
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
VCC = 15V
VO = 1.0V TO 5.0V
RL = 100kΩ
TA= 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)
Figure 5. Error Amplifier Open-Loop Gain and
Phase vs Frequency
Figure 6. Gain Modulator Block Diagram
6
3
ISINE
MULTIPLIER
ERROR
VOLTAGE
9V
GAIN MODULATOR
ISINE
IERR
IERR


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