ml4813 Micro Electronics Corporation, ml4813 Datasheet
ml4813
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ml4813 Summary of contents
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... GENERAL DESCRIPTION The ML4813 is a PWM controller designed for use in a discontinuous "flyback" or "buck-boost" type power factor correction (PFC) system for low power, low cost applications. The circuit includes a precision reference, oscillator, error amplifier, over-voltage comparator, over-current comparator, and an extra op-amp as well as a high current output ...
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... PWM comparator 4 V Control loop feedback voltage FB 5 OVP Overvoltage comparator input 6 OA OUT Output of the uncommitted op amp 7 OA- Inverting input of the uncommitted op amp 2 ML4813 16-Pin PDIP (P16) 16-Pin SOIC (S16W) I LIMIT SOFT START 2 15 GND COMP REF ...
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... Long Term Stability Short Circuit Current Lead Temperature (Soldering, 10 sec) ..................... 260ºC Thermal Resistance ( PDIP ................................................................ 88ºC/W SOIC .............................................................. 105ºC/W OPERATING CONDITIONS Temperature Range ML4813CX ................................................ 0ºC to 70ºC ML4813IX ............................................... -40ºC to 85ºC = 1nF Operating Temperature Range (Notes MIN ...
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... ML4813 ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS ERROR AMPLIFIER Input Offset Voltage Input Bias Current Open Loop Gain 1V < COMP < 5V PSRR 12V < V < 25V CC Output Sink Current Output Source Current Output High Voltage Output Low Voltage Unity Gain Bandwidth UNCOMMITTED OP AMP Input Offset Voltage ...
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... Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions. Note 2: VCC is raised above the UVLO start-up threshold, then returned to 15V. (cont.) MIN I = 10mA OUT 5mA CC OUT I = -20mA OUT I = -200mA OUT C = 1000pF 30mA CC ML4813 TYP MAX UNITS 0.1 0.4 V 1.2 2.2 V 0 16.3 17.5 ...
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... C SYNC longer pulses, as shown in Figure 2. OUTPUT DRIVER STAGE The ML4813 output driver peak output high speed totem-pole circuit designed to quickly drive capacitive loads such as MOSFET gates. See Figure 3 for the output saturation characteristics for sourcing and sinking current. ERROR AMPLIFIER The ML4813 error amplifier is a high open loop gain, wide bandwidth amplifier ...
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... Figure 5. Reference Load Regulation vs. Output Current 100 15V 120Hz RATE GND 600 800 -20 100 120 Figure 6. Supply Current vs. Supply Voltage ML4813 PHASE GAIN 0 10 100 1k 10k 100k 1M Figure 4. Error Amplifier Open Loop Frequency (Hz) Gain and Phase vs. Frequency 25 20 ...
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... ML4813 APPLICATIONS The ML4813 is used to implement a discontinuous mode flyback (buck-boost) power factor regulator as shown in Figure 7. This topology is particularly well suited for low power applications such as fluorescent ballasts and low power switching supplies also a useful topology when there is a requirement for the output voltage to be lower than the peak input voltage, or where an isolated output is required ...
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... The output circuit for this topology, although non- isolated, does not share the same ground with the power circuit. Therefore connecting the two grounds with the measuring leads of instruments should be avoided. ML4813 ). This should be a high quality film IN from the other capacitors which ...
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... ML4813 Figure 9. 80W Flyback Power Factor Regulator Using the ML4813 10 ...
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... The output voltage "rides" on the input voltage when the (+) output is measured with respect to PWR GND as shown in Figure 10. The extra op amp provided in the ML4813 can be used to sense the output voltage for regulation and overvoltage conditions. This op amp is connected as a difference amplifier with its output referenced to PWR GND. ...
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... The error amplifier creates an error voltage from the difference between the output voltage presented at OA OUT and the 5V internal reference. Since the output voltage is not ground referenced, the ML4813's internal op amp is connected as an instrumentation amplifier as shown in Figure 11. The output voltage is set by resistors which determine the ...
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... L3. The core selected is a MicroMetals T68-26D with 80 turns or #24AWG wire. Total Gap N P 0.05" 32 0.05" 32 0.07" 38 Figure 14. EMI Shielding for Ungapped Cores ML4813 SHORTED TURN (COPPER FOIL) 0.25" SPACER WINDINGS 13 ...
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... ML4813 PHYSICAL DIMENSIONS 16 PIN 0.02 MIN (0.50 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.400 - 0.414 (10.16 - 10.52) 16 PIN 0.024 - 0.034 (0.61 - 0.86) (4 PLACES) 0.012 - 0.020 0.090 - 0.094 (0.30 - 0.51) (2.28 - 2.39) 14 inches (millimeters) 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 ...
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... PART NUMBER ML4813CP (EOL) ML4813CS (Obsolete) ML4813IP (Obsolete) ML4813IS (Obsolete) © Micro Linear 1996 is a registered trademark of Micro Linear Corporation. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565761; 5,592,128; 5,594,376. Japan: 2,598,946; 2,619,299. Other patents are pending. ...