ml4802 Microsemi Corporation, ml4802 Datasheet
ml4802
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ml4802 Summary of contents
Page 1
... Power Factor Correction (PFC) offers the use of lower cost bulk capacitors, reduces power line loading and stress on the switching FETs. The ML4802 includes circuits for the implementation of a leading edge, average current, “boost” type power factor corrector and a trailing edge Pulse Width Modulator (PWM) ...
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... Connection point for the PWM soft start capacitor 6 VDC PWM feedback voltage input 7 RT/CT Connection for master (PWM) oscillator frequency setting components 8 RAMP 1 PFC ramp input 2 ML4802 16-Pin PDIP (P16) 16-Pin Narrow SOIC (S16N) IEAO 1 16 VEAO IAC 2 15 VFB ISENSE 3 14 ...
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... Lead Temperature (Soldering, 10 sec) ..................... 260°C Thermal Resistance ( ja) Plastic DIP ....................................................... 80°C/W Plastic SOIC ................................................... 105°C/W OPERATING CONDITIONS Temperature Range ML4802CX ................................................. 0°C to 70°C ML4802IX .............................................. –40°C to 85°C CONDITIONS VNON INV = VINV, VEAO = 3.75V Note 2 VIN = ±0.5V, VOUT = 6V VIN = ±0.5V, VOUT = 1.5V 11V < ...
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... ML4802 ELECTRICAL CHARACTERISTICS (Continued) SYMBOL PARAMETER OVP COMPARATOR Threshold Voltage Hysteresis PFC ILIMIT COMPARATOR Threshold Voltage PFC ILIMIT Threshold - Gain Modulator Output Delay to Output DC ILIMIT COMPARATOR Threshold Voltage Input Bias Current Delay to Output VIN OK COMPARATOR Threshold Voltage Hysteresis GAIN MODULATOR Gain (Note 3) ...
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... IOUT = –100mA IOUT = –10mA, VCC = 11V IOUT = 20mA IOUT = 100mA CL = 1000pF IOUT = –20mA IOUT = –100mA IOUT = –10mA, VCC = 11V IOUT = 20mA IOUT = 100mA CL = 1000pF VCC = 12V VCC = 14V August 2000 Datasheet ML4802 MIN TYP MAX UNITS 7.4 7 ...
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... PWM compensation due to the reduced ripple on the PFC output capacitor (the PWM input capacitor). The PWM section of the ML4802 runs at twice the frequency of the PFC, which allows the use of smaller PWM output magnetics and filter capacitors while holding down the losses in the PFC stage power components ...
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... For the ML4802, a good value to use is 425V DC out, to allow for a high line of 270V AC while in Green Mode. The other condition is that the current which the converter is allowed to draw from the line at any given instant must be proportional to the line voltage ...
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... PFC SECTION Gain Modulator Figure 3 shows a block diagram of the PFC section of the ML4802. The gain modulator is the heart of the PFC this circuit block which controls the response of the current loop to line voltage waveform and frequency, rms line voltage, and PFC output voltage. There are three inputs to the gain modulator ...
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... VFB drops below 2.5V. ™ The VFB should be set at a level where the active and passive external power components and the ML4802 are within their safe operating voltages, but not so low as to interfere with the boost voltage regulation loop. ™ IAC ...
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... ML4802 FUNCTIONAL DESCRIPTION (Continued) The major concern when compensating the ML4802's voltage loop error amplifier is that the current amplifier compensation is chosen to optimize frequency response while maintaining good stability. This leads to the following rules of thumb: the crossover frequency of the current amplifier should be at least 10 times that of the voltage amplifier to prevent interaction with the voltage loop ...
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... PWM section. The PWM start-up delay should be at least 5ms. Solving for the minimum value of CSS: Generating VCC The ML4802 is a voltage-fed part. It requires an external 15V±10% (or better) Zener shunt voltage regulator, or other controlled supply, to maintain the voltage supplied to the part at 15V nominal. This allows a low power ...
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... ML4802 FUNCTIONAL DESCRIPTION (Continued) In the case of leading edge modulation, the switch is turned OFF right at the leading edge of the system clock. When the modulating ramp reaches the level of the error amplifier output voltage, the switch will be turned ON. The effective duty-cycle of the leading edge modulation is determined during the OFF time of the switch ...
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... Figure 7. 100W Power Factor Corrected Power Supply August 2000 Datasheet ML4802 13 ...
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... ML4802 PHYSICAL DIMENSIONS inches (millimeters) 16 PIN 0.02 MIN (0.50 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.055 - 0.061 (1.40 - 1.55) 14 Package: P16 16-Pin PDIP 0.740 - 0.760 (18.79 - 19.31) 0.240 - 0.260 (6.09 - 6.61) 0.055 - 0.065 0.100 BSC (1.40 - 1.65) (2.54 BSC) 0.015 MIN (0.38 MIN) SEATING PLANE 0.016 - 0.022 (0 ...
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... Micro Linear Corporation 2092 Concourse Drive San Jose, CA 95131 Tel: (408) 433-5200 Fax: (408) 432-0295 www.microlinear.com August 2000 Datasheet ML4802 PACKAGE 16-Pin Plastic DIP (P16) 16-Pin Narrow SOIC (S16N) 16-Pin Plastic DIP (P16) 16-Pin Narrow SOIC (S16N) DS4802-02 15 ...