ML4819 datasheet(6/15 Pages) FAIRCHILD

Teilenummer	ML4819

Bauteilbeschribung	Power Factor and PWM Controller ?쏞ombo?

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Hersteller	FAIRCHILD [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

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

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

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