NCP1236AD100R2G ON Semiconductor, NCP1236AD100R2G Datasheet
NCP1236AD100R2G
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NCP1236AD100R2G Summary of contents
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NCP1236 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1236 is a new fixed−frequency current−mode controller featuring Dynamic Self−Supply (DSS). This device is pin−to−pin compatible with the previous NCP12xx families. The DSS function greatly simplifies the design of the ...
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VIN (dc) LATCH FB CS GND Figure 1. Flyback Converter Application Using the NCP1236 OPTIONS Part Option NCP1236 PIN FUNCTION DESCRIPTION Pin No Pin Name Function 1 LATCH Latch−Off Input 2 FB ...
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SIMPLIFIED INTERNAL BLOCK SCHEMATIC − NTC V I OVP NTC − Latch + + OTP V clamp V FB(ref sample + − I ...
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MAXIMUM RATINGS Supply Pin (pin 6) (Note 2) Voltage range Current range High Voltage Pin (pin 8) (Note 2) Voltage range Current range Driver Pin (pin 5) (Note 2) Voltage range Current range All other pins (Note 2) Voltage range ...
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ELECTRICAL CHARACTERISTICS (For typical values unless otherwise noted) CC Characteristics HIGH VOLTAGE CURRENT SOURCE Minimum voltage for current source operation Current flowing out of V pin Off−state leakage current V ...
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ELECTRICAL CHARACTERISTICS (For typical values unless otherwise noted) CC Characteristics CURRENT SENSE Input Bias Current V CS Maximum internal current V FB setpoint Propagation delay from V V Ilimit CS detection to DRV off Leading ...
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ELECTRICAL CHARACTERISTICS (For typical values unless otherwise noted) CC Characteristics SKIP−CYCLE MODE Feedback voltage thresholds for V FB skip mode V FB LATCH−OFF INPUT High threshold V Latch Low threshold V Latch Current source for ...
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TYPICAL PERFORMANCE CHARACTERISTICS 40.00 38.00 36.00 34.00 32.00 30.00 28.00 26.00 24.00 22.00 20.00 −50 − TEMPERATURE (°C) Figure 3. Minimum Current Source Operation V HV(min) 120 115 110 105 100 95 90 −50 − ...
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TYPICAL PERFORMANCE CHARACTERISTICS 110 100 −50 − TEMPERATURE (°C) Figure 9. Propagation Delay −50 − TEMPERATURE (°C) ...
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TYPICAL PERFORMANCE CHARACTERISTICS −50 − TEMPERATURE (°C) Figure 15. Maximum Duty Cycle D 1.50 1.45 1.40 1.35 1.30 1.25 1.20 −50 − TEMPERATURE ...
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TYPICAL PERFORMANCE CHARACTERISTICS 150 145 140 135 130 125 120 115 110 −50 − TEMPERATURE (°C) Figure 21. Maximum Overpower Compensating Current I OPC(365 Pin 2.40 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 1.95 ...
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TYPICAL PERFORMANCE CHARACTERISTICS 2.80 2.70 2.60 2.50 2.40 2.30 2.20 2.10 2.00 −50 − TEMPERATURE (°C) Figure 27. Latch Pin Voltage V Pin is Sinking 1 mA) 220 210 200 190 180 170 160 150 140 −50 ...
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... version. • High Voltage Start−Up Current Source with Brown−Out Detection: Due to ON Semiconductor’s Very High Voltage technology, the NCP1236 can be directly connected to the high input voltage. The start−up current source ensures a clean start−up and the Dynamic Self− ...
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Typical Operation • Start−up: The HV start−up current source ensures the charging of the V capacitor up to the start−up CC threshold V , until the input voltage is high CC(on) enough (above allow the switching to ...
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High−Voltage Current Source with Built−in Brown−out Detection The NCP1236 HV pin can be connected either to the rectified bulk voltage the ac line through a rectifier. Start−up HV VCC Figure 30. HV Start−up Current Source Functional Schematic At ...
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HV(start) V HV(min CC(on) V CC(min) V CC(inhibit) DRV For safety reasons, the start−up current is lowered when V is below reduce the power dissipation in CC CC(inhibit) case the V ...
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HV stop Brown-out or AC OVP detected CC(on) V CC(min) DRV When V crosses the V threshold, the controller HV HV(start) can start immediately. When it crosses V Waits next V before CC(on) starting Figure 32. Brown−out ...
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HV(start) V HV(stop) Starts at next V DRV CC(ON) Figure 33. AC Input Brown−out Timing Diagram Oscillator with Maximum Duty Cycle and Frequency Jittering The NCP1236 includes an oscillator that sets the switching frequency with an accuracy ...
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CURRENT−MODE CONTROL WITH OVERPOWER COMPENSATION AND SOFT−START Current sensing NCP1236 is a current−mode controller, which means that the FB voltage sets the peak current flowing in the inductance and the MOSFET. This is done through a PWM comparator: the current ...
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FB(fault) Soft-start ramp V ILIM CS Setpoint V ILIMI Under some conditions, like a winding short−circuit for instance, not all the energy stored during the on time is transferred to the output during the off time, even ...
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LIMIT High Line Figure 38. Line Compensation for True Overpower Protection To compensate this and have an accurate overpower protection, an offset proportional to the input voltage is added on the CS signal by turning on an ...
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I OPC Figure 40. Overpower Compensation Current Relation to Feedback Voltage and Input Voltage HV(stop) Sample/reset signal HV One shot timer starts Peak detector Reset I Sample OPC Sample V V FB(OPCE) FB(OPCF timer timer ...
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HV(stop Peak detector I OPC Sample Feedback with Slope Compensation The ratio from the FB voltage to the current sense setpoint is 5, meaning that the FB voltage corresponding order ...
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Overcurrent protection with Fault timer When an overcurrent occurs on the output of the power supply, the FB loop asks for more power than the controller can deliver, and the CS setpoint reaches V event occurs, an internal t timer ...
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Overcurrent Output Load applied Max Load Fault Flag starts CC(on) V CC(min) DRV Fault timer t fault t fault Figure 45. Autorecovery Timer−Based Protection Mode In the latched version, the controller can restart only if a brown−out ...
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Output Load Overcurrent applied Max Load Fault Flag Fault timer starts CC(on) V CC(min) DRV Fault timer t fault Figure 46. Latched Timer−Based Overcurrent Protection t fault http://onsemi.com 26 No restart when fault disappears time time time ...
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Frequency Foldback In order to improve the efficiency in light load conditions, the frequency of the internal oscillator is linearly reduced from its nominal value down to f OSC(min) foldback starts when the voltage on FB pin goes below f ...
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FB(fold) V skip(out) V skip(in) Enters skip DRV Latch−off Input VDD I NTC Latch clamp Soft−start The Latch pin is dedicated to the latch−off function: it includes two levels of detection that define a ...
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DRV switching starts only allowed; whereas the Low latch (typically sensing an overtemperature) is taken into account only after the soft−start is finished. In addition, the NTC current is doubled to I the soft−start period, ...
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HV Start−up Current Source No TSD TSD Stop Figure 52. HV Start−up Current Source State Diagram STATE DIAGRAMS start1 V < CC(inhibit) TSD TSD V < CC(min) TSD http://onsemi.com 30 > V CC(inhibit) ...
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Controller Operation (Latched Version: A Option) • Brown−out • TSD Stopped • Brown−out • VCC reset Latch • High Latch • Low Latch • V > CC(ovp) Figure 53. Controller Operation State Diagram (Latched Protection) V > V ...
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Controller Operation (Autorecovery Version: B Option) • t counting autorec • Brown−out • TSD Stopped • Brown− out • VCC reset Latch • High Latch • Low Latch • V > CC(ovp) Figure 54. Controller Operation State Diagram ...
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... Table 1. ORDERING INFORMATION Part No. NCP1236AD65R2G NCP1236AD100R2G NCP1236BD65R2G NCP1236BD100R2G NCP1236CD65R2G (Note 7) NCP1236CD100R2G (Note 7) NCP1236DD65R2G NCP1236DD100R2G (Note 7) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 7. Contact your ON Semiconductor Sales Representative. These parts will be released upon customer request. ...
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... M S *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. The product described herein (NCP1236) may be covered by one or more of the following U.S. patents: 5,073,850, 6,271,735, 6,362,067, 6,385,060, 6,597,221, 6,633,193, 6,587,351, 6,940,320. There may be other patents pending. ...