ncp1608d ON Semiconductor, ncp1608d Datasheet
ncp1608d
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ncp1608d Summary of contents
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NCP1608 Critical Conduction Mode PFC Controller Utilizing OTA The NCP1608 is an active power factor correction (PFC) controller specifically designed for use as a pre−converter in ac−dc adapters, electronic ballasts, and other medium power off−line converters (typically up to 350 ...
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ZCD + C in EMI AC Line Filter + V V out + C bulk R out1 V FB E/A R out2 Haversine Control V Control COMP N :N ...
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Table 1. PIN FUNCTION DESCRIPTION Pin Name 1 FB The FB pin is the inverting input of the internal error amplifier. A resistor divider scales the output voltage to V tain regulation. The feedback voltage is used for overvoltage and ...
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Table 3. ELECTRICAL CHARACTERISTICS Control CS (For typical values 25°C. For min/max values Characteristic STARTUP AND SUPPLY CIRCUITS ...
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Table 3. ELECTRICAL CHARACTERISTICS Control CS (For typical values 25°C. For min/max values Characteristic RAMP CONTROL Ct Peak ...
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T , JUNCTION TEMPERATURE (°C) J Figure 3. Overvoltage Detect Threshold vs. Junction Temperature 0.330 0.325 0.320 0.315 0.310 0.305 0.300 −50 − JUNCTION TEMPERATURE ...
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T , JUNCTION TEMPERATURE (°C) J Figure 9. Error Amplifier Sink Current vs. Junction Temperature 125 120 115 110 105 100 −50 − ...
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T , JUNCTION TEMPERATURE (°C) J Figure 15. Ct Peak Voltage vs. Junction Temperature 0.520 0.515 0.510 0.505 0.500 0.495 0.490 0.485 0.480 −50 − ...
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V 12 CC(on CC(off −50 − JUNCTION TEMPERATURE (°C) J Figure 21. Supply Voltage Thresholds vs. Junction Temperature 2.16 2.14 2.12 2.10 2.08 2.06 2.04 2.02 2.00 −50 ...
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Introduction The NCP1608 is a voltage mode, power factor correction (PFC) controller designed to drive cost effective pre-converters to comply with input line harmonic regulations. This controller operates in CrM suitable for applications up to 350 W. Its voltage mode ...
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Active circuits operate at a higher frequency, which enables them to be physically smaller, weigh less, and operate more efficiently than a passive circuit. With proper control of an active ...
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When the switch is closed, the inductor current increases linearly to the peak value. When the switch opens, the inductor current linearly decreases to zero. When the inductor current decreases to zero, the drain voltage of the switch (V ) ...
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A resistor divider (R and R ) scales down the boost out1 out2 output voltage (V ) and is connected to the FB pin. If the out output voltage is less than the target output voltage, then V is less ...
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V Control Control charge Ct + DRV Ct (offset Control V Ct(off DRV Figure 31. On Time Generation V varies with the rms input voltage and output Control load, which naturally satisfies ...
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ZCD R sense R ZCD This sequence achieves CrM operation. The maximum V sets the maximum turns ratio and is calculated ZCD(ARM) using Equation 11 Vac out ...
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During the delay caused by R and the ZCD pin capacitance, the equivalent drain capacitance (C ZCD through the path shown in Figure 35 EMI AC Line Filter Figure 35. Equivalent Drain Capacitance Discharge Path C is the ...
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V Control Ct (offset) Low Noise Induced Voltage Spike V Ct(off) Low V DRV V ZCD V ZCD(ARM) V ZCD(ARM) is Not Exceeded V ZCD(TRIG) V CL(NEG) DRV Remains Off t on(loop start Figure ...
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PFC(Vcc Figure 40. NCP1608 Supplied by a Downstream SMPS Controller (NCP1230) Soft Start When V exceeds begins counting. When CC CC(on) start t expires, the error amplifier is ...
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Overvoltage Protection (OVP) The low bandwidth of the feedback network causes active PFC stages to react to changes in output load or input voltages slowly. Consequently, there is a risk of overshoots during transient conditions (i.e. startup, load steps, etc.). ...
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FPP Protection: The FB pin is floating. The internal pull down resistor R FB voltage below V . The UVP comparator UVP detects an UVP fault, the drive and error amplifier are disabled. UVP and OVP protect the system ...
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... Application Information ON Semiconductor provides an electronic design tool, a demonstration board, and an application note to facilitate the design of the NCP1608 and reduce development cycle time. All the tools can be downloaded or ordered at www.onsemi.com. Bridge The electronic design tool allows the user to easily determine most of the system parameters of a boost pre− ...
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BOOST DESIGN EQUATIONS Components are identified in Figure 1 rms Input Current Maximum Inductor Peak Current Inductor Value Maximum On Time Off Time Switching Frequency Time Capacitor Inductor Turns to ZCD Turns Ratio Resistor from ZCD winding ...
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BOOST DESIGN EQUATIONS Components are identified in Figure 1 (Continued) Minimum Output Voltage for UVP Recovery V out(UVP) Inductor rms Current Output Diode rms Current I D(RMS),MAX MOSFET rms Current + 2 I M(RMS) MOSFET Sense Resistor Type 1 Compensation ...
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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 products described herein (NCP1608), may be covered by one or more of the following U.S. patents: 6,362,067, 5,359,281, 5,073,850. There may be other patents pending. ...