ncp1397a ON Semiconductor, ncp1397a Datasheet
ncp1397a
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ncp1397a Summary of contents
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... NCP1397A, NCP1397B High Performance Resonant Mode Controller with Integrated High-Voltage Drivers The NCP1397 is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and LLC resonant converters. It integrates 600 V gate drivers, simplifying layout and reducing external component count. ...
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... This input features also second fault comparator with higher threshold (1.5 V typically) that: A) Speeds up the timer capacitor charging current 8 times – NCP1397A B) latches off the IC permanently – NCP1397B In both versions the second fault comparator helps to protect application in case of short circuit on the output or transformer secondary winding ...
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... VFB(fault) VFB(min) IDT DT VDD 20 ms Noise IBO Filter BO + − VBO Fault + − Vref(fault) − + Vref(OCP) Figure 2. Internal Circuit Architecture (NCP1397A Clk Q − 50 Adj. Timeout Fault Timeout Fault PON Reset Fault > 0 only − VDD V = V(FB) − VFB(min) ...
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VDD Imin VFB ≤ VFB(off) Vref Vref Rt IDT Imax for Vfb = 5 for Vfb < Vfb_min VDD Imax Vfb = 5 VDD Vref Itimer1 Fmax If FAULT Itimer else 0 + ...
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MAXIMUM RATINGS Rating High Voltage bridge pin, pin 14 Floating supply voltage, ground referenced High side output voltage Low side output voltage Allowable output slew rate Power Supply voltage, pin 12 Maximum voltage, all pins (except pin 11 and 10) ...
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ELECTRICAL CHARACTERISTICS = 12 V unless otherwise noted) Symbol SUPPLY SECTION V Turn−on threshold level, V CC(on Minimum operating voltage after turn−on CC(min) V Startup voltage on the floating section boot(on) V Cutoff voltage on the floating section ...
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ELECTRICAL CHARACTERISTICS = 12 V unless otherwise noted) Symbol TIMERS I Timer capacitor charge current when V timer2 I ) – A version only charge2 T Timer duration with capacitor and resistor, I timer ...
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TEMPERATURE (°C) Figure 4. V Threshold CC(on) 60.05 60 59.95 59.9 59.85 59.8 59.75 −40 − TEMPERATURE (°C) Figure 6. F Frequency Clamp SW(min) ...
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TEMPERATURE (°C) Figure 10. Source Resistance (ROH) 114 113 112 111 110 109 108 107 106 105 104 −40 −25 − ...
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TEMPERATURE (°C) Figure 16. Brown−Out Reference (VBO) 1.050 1.048 1.046 1.044 1.042 1.040 1.038 1.036 1.034 1.032 −40 −25 − ...
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TEMPERATURE (°C) Figure 22. Fault Timer Ending Voltage (V ) timer(on) 1.000 0.999 0.998 0.997 0.996 0.995 0.994 0.993 0.992 −40 −25 −10 5 Figure 24. ...
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... The NCP1397A/B includes all necessary features to help building a rugged and safe switch−mode power supply featuring an extremely low standby power. The below bullets detail the benefits brought by implementing the NCP1397A/B controller: • Wide frequency range: A high−speed Voltage Control Oscillator allows an output frequency excursion from ...
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Rt Rt sets Fmin for V(FB RDT sets the deadtime V CC Fmax Fmax sets the maximum The designer needs to program the maximum switching frequency and the minimum switching frequency. In LLC configurations, ...
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This techniques allows us to detect a fault on the converter in case the FB pin cannot rise above 0.3 V (to actually close the loop) in less than a duration imposed by the programmable timer. Please refer to the ...
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R (kW) Fmin Figure 30. Minimum Switching Frequency Resistor Selection (F = 100 kHz to 500 kHz) min 100 ...
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Fstart(adj) − RFstart/RFmin Fmin(adj) − RFmin Fmax(adj) − Rskip1 + Rskip2 RFstart RFmin CSS Figure 34. Feedback Configuration Using Direct Connection to the Rt Pin Fstart(adj) − RFstart/RFmin Fmin(adj) − RFmin Fmax(adj) − Rskip1 + Rskip2 ...
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... VCO lead as soon as the output voltage has reached the target. If not, then the minimum switching frequency is reached and a fault is detected on the feedback pin (typically below 300 mV). Figure 38 depicts a typical LLC startup using NCP1397A/B controller. SS Fmax RF(start) ...
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Clock Pulses 12.0 8.00 4.00 0 8.00 4.00 0 −4.00 A − B −8.00 56.2 m Brown−Out protection The Brown−Out circuitry (BO) offers a way to protect the resonant converter from low DC input ...
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Figure 41. Simulation Results for 350 / 250 ON / OFF Levels To the contrary, when the internal BO signal is high (M and M pulse), the IBO ...
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... Fault input to permanently latch the application and protect against destruction. Figure 44 depicts the architecture of the fault circuitry for NCP1397B controller. The NCP1397A features second fault comparator as well but in this case it doesn’t latches off the IC but speeds up the Fault timer capacitor charging by turning on additional ...
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... VtimerOFF Reset DRIVING SS LOGIC discharge at VCC(on)/ VDD restart if VFB < 0 Vref(fault) Vref(OCP Vref(skip fault Figure 43. Fault Input Logic for NCP1397A http://onsemi.com 21 SS(dis) Css Ctimer Ctimer Average Rtimer Input Current Fault To Primary Current Sensing Circuitry + - VCC + FB Skip/Disable Skip ...
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VDD Itimer1 UVLO Reset + + - VtimerON VtimerOFF 0 = fault Reset DRIVING SS LOGIC On Figures 43 and 44 examples, a voltage proportional to primary current, once averaged, gives an image of the input power ...
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SMPS Stops Fault is Gone Figure 45. A Resistor Can Easily Program the Capacitor Discharge Time Skip/Disable Figure 46. Skip Cycle Can Be Implemented Via Two Resistors on the FB Pin to the Fast Fault Input Skip/Disable ...
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Figure 47. At Power On, Output A is First Activated and the Frequency Slowly Decreases Based on the Soft−Start Figure 47 depicts an auto−recovery situation, where the timer has triggered the end of output pulses. In that case, the V ...
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Figure 48. When the Low, All Pulses are Stopped Until V CC The High−Voltage Driver The driver features a traditional bootstrap circuitry, requiring an external high−voltage diode for the capacitor B Pulse Trigger Fault Delay A Figure ...
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... ORDERING INFORMATION Device NCP1397ADR2G NCP1397DR2G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. As stated in the maximum rating section, the floating ...
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... ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. The product described herein (NCP1397A/B), is covered by U.S. patent: 6,097, 075; 7176723; 6,362, 067. There may be some other patent pending. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein ...