ML4827CP-1 Micro Linear, ML4827CP-1 Datasheet
ML4827CP-1
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ML4827CP-1 Summary of contents
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Fault-Protected PFC and PWM Controller Combo GENERAL DESCRIPTION The ML4827 is a controller for power factor corrected, switched mode power supplies, that includes circuitry necessary for conformance to the safety requirements of UL1950. A direct descendent of the industry-standard ML4824-1, ...
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ML4827 PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 IEAO PFC transconductance current error amplifier output 2 I PFC gain control reference input Current sense input to the PFC current SENSE limit comparator 4 V Input for ...
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ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. V Shunt Regulator Current .................................. 55mA CC I Voltage ...
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ML4827 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER TRI-FAULT DETECT Fault Detect HIGH Time to Fault Detect HIGH Fault Detect LOW PFC I COMPARATOR LIMIT Threshold Voltage (PFC Gain Modulator Output) LIMIT TH Delay to Output DC I COMPARATOR LIMIT ...
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ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Temperature Stability Total Variation Long Term Stability PFC Minimum Duty Cycle Maximum Duty Cycle Output Low Voltage Output High Voltage Rise/Fall Time PWM Duty Cycle Range Output Low Voltage ...
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ML4827 TYPICAL PERFORMANCE CHARACTERISTICS 250 200 150 100 (V) Voltage Error Amplifier (VEA) Transconductance (g 16 VEAO V FB VEA IEA 3.5k 15 – + 2.5V + – GAIN ...
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FUNCTIONAL DESCRIPTION The ML4827 consists of an average current controlled, continuous boost Power Factor Corrector (PFC) front end and a synchronized Pulse Width Modulator (PWM) back end. The PWM can be used in either current or voltage mode. In voltage ...
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ML4827 FUNCTIONAL DESCRIPTION modulator Sampling current in this way AC minimizes ground noise required in high power switching power conversion environments. The gain modulator responds linearly to this current voltage proportional to the ...
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FUNCTIONAL DESCRIPTION Error Amplifier Compensation The PWM loading of the PFC can be modeled as a negative resistor; an increase in input voltage to the PWM causes a decrease in the input current. This response dictates the proper compensation of ...
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ML4827 FUNCTIONAL DESCRIPTION PWM SECTION Pulse Width Modulator The PWM section of the ML4827 is straightforward, but there are several points which should be noted. Foremost among these is its inherent synchronization to the PFC section of the device, from ...
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FUNCTIONAL DESCRIPTION voltage for which the PWM output transistor must be rated. Frequently, the design of the tranformer’s reset winding, and/or of the output transistor’s snubbers or clamps, require an additional voltage margin of 100V to 200V. To put some ...
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ML4827 FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION Using the recommended values of MIN = 64% for a high- application, a MOSFET switch with a Drain-Source breakdown voltage of 900V some cases as low as 800V, can reliably be used. Such ...
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FUNCTIONAL DESCRIPTION The ML4827 should be locally bypassed with a 10nF and ceramic capacitor. In most applications, an electrolytic capacitor of between 100 F and 330 F is also required across the part, both for filtering and ...
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... RAMP 2 C18 470pF C11 10nF Figure 7. 100W Power Factor Corrected Power Supply, Designed Using Micro Linear Application Note 33. 14 TYPICAL APPLICATIONS (Continued) Figure 7 is the application circuit for a complete 100W power factor corrected power supply. This circuit was designed using the methods and topology detailed in Application Note 33 ...
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PHYSICAL DIMENSIONS 16 PIN 0.02 MIN (0.50 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.055 - 0.061 (1.40 - 1.55) inches (millimeters) Package: ...
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... ML4827 ORDERING INFORMATION PART NUMBER ML4827CP-1 ML4827CP-2 ML4827CS-1 ML4827CS-2 ML4827IP-1 ML4827IP-2 ML4827IS-1 ML4827IS-2 © Micro Linear 1998 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. 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; ...