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ML4819CS Scheda tecnica(PDF) 6 Page - Micro Linear Corporation |
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ML4819CS Scheda tecnica(HTML) 6 Page - Micro Linear Corporation |
6 / 15 page ML4819 6 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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