ML4819CP 查看數據表（PDF） - Micro Linear Corporation
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ML4819CP Datasheet PDF : 15 Pages
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ML4819
50
VCC = 15V
TA = 25 C
30
20
10
8
5
10nF
1nF
2nF
5nF
95%
500pF
100pF
200pF
90%
85%
3
20
30
50
100
200 300
500
fOSC, OSCILLATOR FREQUENCY (kHz)
MAX DUTY CYCLE
Figure 2. Oscillator Timing Resistance vs. Frequency
0
VCC
–1.0
–2.0
SOURCE SATURATION
(LOAD TO GROUND)
TA = 25 C
VCC = 15V
80µs PULSED LOAD
120 Hz RATE
100
0
VCC = 15V
80
GAIN
VO = 1.0V TO 5.0V
RL = 100kΩ
–30
TA= 25 C
60
60
40
90
PHASE
20
120
0
150
–20
180
10
100
1.0k
10k
100k 1.0M
10M
f, FREQUENCY (Hz)
Figure 5. Error Amplifier Open-Loop Gain and
Phase vs Frequency
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.
3.0
2.0
TA = 25 C
1.0
0
0
SINK SATURATION
(LOAD TO VCC)
GND
200
400
600
800
IO, OUTPUT LOAD CURRENT (mA)
Figure 3. Output Saturation Voltage vs. Output Current
ERROR AMPLIFIER
The ML4819 error amplifier is a high open loop gain, wide
bandwidth amplifier.
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.
+5V
+
INV
4
–
3 EA OUT
+8V
0.5mA
Figure 4. Error Amplifier Configuration
6
ISINE
6
IERR
ERROR
VOLTAGE
9V
GAIN MODULATOR
ISINE ! IERR
MULTIPLIER
3
Figure 6. Gain Modulator Block Diagram
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