ncl30051 ON Semiconductor, ncl30051 Datasheet
ncl30051
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ncl30051 Summary of contents
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... This device includes an enable input on the PFC feedback pin, open feedback loop protection and PFC overvoltage and undervoltage detectors. Other features included in the NCL30051 are a 650 V startup circuit and an adjustable frequency oscillator. The controllers are properly sequenced, simplifying system design. Features • ...
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VCC PDRV UVLO ZCD PDRV Comparator PZCD + − ZCD > 5.65 V Clamp PControl < 2.25 V UVLO Clamp PFC UVP Amplifier PFB − PFB + − On time Comparator ...
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Table 1. PIN FUNCTION DESCRIPTION Pin Name 1 HV This is the input of the high voltage startup regulator and connects directly to the bulk voltage. A constant cur- rent source supplies current from this pin to the V istor. ...
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Table 2. MAXIMUM RATINGS (Notes 1 and 2) Rating High Voltage Input Voltage High Voltage Input Current Supply Input Voltage Supply Input Current Oscillator Input Voltage Oscillator Input Current Bandgap Reference Decoupling Output Voltage Bandgap Reference Decoupling Output Current PFC ...
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Table 3. ELECTRICAL CHARACTERISTICS V = open open PDRV HDRVlo HVS values T = 25°C, for min/max values Characteristics STARTUP AND SUPPLY CIRCUITS Supply Voltage Startup Threshold Minimum Enable Threshold ...
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Table 4. ELECTRICAL CHARACTERISTICS V = open open PDRV HDRVlo HVS values T = 25°C, for min/max values Characteristics PFC CURRENT SENSE Current Sense Threshold Voltage Current Sense Input Bias ...
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Table 5. ELECTRICAL CHARACTERISTICS V = open open PDRV HDRVlo HVS values T = 25°C, for min/max values Characteristics HALF BRIDGE HIGH SIDE DRIVER Half−Bridge High Side Driver Rise Time ...
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... Introduction The NCL30051 is a combination of PFC and half−bridge resonant controllers optimized for off−line adapter applications. This device includes all the features needed to implement a highly efficient and small form factor adapter. It integrates a critical conduction mode (CrM) power factor correction (PFC) controller and half−bridge controller with a built− ...
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... L is the PFC inductor out inductance and h is the system efficiency. On Time Control The NCL30051 controls the on time by charging an external timing capacitor on the PCT pin, C constant current source, I compared to the control voltage, V voltage is constant for a given RMS line voltage and output load, satisfying Equation 2 ...
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its maximum. Equation 3 is used to PControl calculate the on time for a given PCT(MAX on(MAX) I PCT(C) Substituting t in Equation 2 with Equation 3 ...
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... This comparison is done on a cycle by cycle PCS(ILIM) basis. The overcurrent threshold is typically 0.84 V. The current sense signal is prone to leading edge spikes caused by the power switch transitions. The NCL30051 has leading edge blanking circuitry that blocks out the first 110 ns (typical) of each current pulse. PFC Driver @ R (eq ...
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... CC Analog and Power Ground is boost The NCL30051 has an analog ground, GND, and a power ground, PGND, terminal. GND is used for analog connections such as VREF and OSC. PGND is used for high current connections such as the gate drivers recommended to have independent analog and power ground planes and connect them at a single point, preferably at the ground terminal of the system ...
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... The products described herein (NCL30051) may be covered by one or more of the following U.S. patents: 6,373,734. There may be other patents 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. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “ ...