ncp4303a ON Semiconductor, ncp4303a Datasheet
ncp4303a
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ncp4303a Summary of contents
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... Adjustable Minimum Off Time Independent of V • 2.5 A Peak Current Sink / Source Drive Capability • Operating Voltage Range • Gate Drive Clamp of Either 12 V (NCP4303A (NCP4303B) • Low Startup and Standby Current Consumption • Maximum Frequency of Operation up to 500 kHz • ...
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Figure 1. Typical Application Example – LLC Converter Figure 2. Typical Application Example − DCM or QR Flyback Converter http://onsemi.com 2 ...
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PIN FUNCTION DESCRIPTION Pin No. Pin Name Function 1 VCC Supplies the driver 2 Min_toff Minimum off time adjust 3 Min_ton Minimum on time adjust 4 TRIG/Disable Forced reset input 5 CS Current sense of the SR MOSFET 6 COMP ...
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MAXIMUM RATINGS Symbol V IC supply voltage CC V Driver output voltage DRV V Current sense input dc voltage CS V Current sense input dynamic voltage (t Csdyn V Trigger input voltage TRIG Min_Ton and Min_Toff input ...
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ELECTRICAL CHARACTERISTICS (For typical values nF load _min_ton _min_toff otherwise noted) Symbol SUPPLY SECTION V Turn−on threshold level (V CC_on V Minimum operating voltage after turn−on (V CC_off V V ...
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ELECTRICAL CHARACTERISTICS (For typical values nF load _min_ton _min_toff otherwise noted) Symbol CS INPUT input leakage current Leakage TRIGGER/DISABLE INPUT T Minimum trigger pulse duration ...
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TEMPERATURE (°C) Figure 4. V Startup Voltage CC 1.07 1.065 1.06 1.055 1.05 1.045 1.04 1.035 −40 −25 − TEMPERATURE ...
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TEMPERATURE (°C) Figure 10. Driver High Level – B Version and load 9.96 9.94 ...
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TEMPERATURE (°C) Figure 16. Driver Clamp Level – B Version and C CC load ...
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TEMPERATURE (°C) Figure 22. Trigger Input Threshold Voltage 117 116.5 116 115.5 115 114.5 114 113.5 113 −40 −25 − TEMPERATURE (°C) Figure ...
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TEMPERATURE (°C) Figure 28. Minimum on Time @ 5340 5320 5300 5280 5260 5240 5220 5200 5180 −40 −25 −10 5 ...
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General Description The NCP4303 is designed to operate either as a standalone companion primary side controller to help achieve efficient synchronous rectification in switch mode power supplies. This controller features a high current ...
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Figure 33. ZCD Sensing Circuitry Functionality When the voltage on the secondary winding of the SMPS reverses, the body diode of M1 starts to conduct current and the voltage of M1’s drain drops approximately to −1 V. The CS pin ...
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Figure 34. ZCD Comparators Thresholds and Blanking Periods Timing resistor is used, the turn−on and turn−off shift_cs thresholds are fully given by the CS input specification (please refer to parametric table). Once non−zero R resistor is used, ...
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Figure 35. Waveforms from SR System Using MOSFET in TO220 Package without Parasitic Inductance Compensation – SR MOSFET Channel Conduction Time is Reduced Note that the efficiency impact of the error caused by parasitic inductance increases with lower R MOSFETs ...
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Typical value of compensation inductance for a TO220 package is 7 nH. The parasitic inductance can differ depends on how much are the leads shortened during the assembly process. The compensation inductance design has to be done with enough margin ...
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Figure 38. Recommended Layout When Parasitic Inductance Compensation is Used Trigger/Disable input The NCP4303 features an ultrafast trigger input that exhibits a typically delay from its activation to the turn−off of the SR MOSFET. The main purpose ...
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Figure 41. Trigger Input Functionality Waveforms The NCP4303 operation can be disabled using the trigger/disable input. If the trigger/disable input is pulled up (above 1.5 V) the driver is disabled immediately. In some cases, the driver is activated one more ...
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Figure 43. Operating Waveforms for the Trig/Disable Input – Device Sleep Mode Transition – Case 2 Figure 44. Operating Waveforms for the Trig/Disable Input –Wake−up from Sleep Mode If the trigger signal comes periodically and the trigger pulse overlaps the ...
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A typical application schematic of a CCM flyback converter with the NCP4303 driver can be seen in Figure 46. In this application the trigger signal is taken directly from the flyback controller driver output and transmitted to the secondary side ...
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Figure 47. Internal Connection of the Min_Ton Generator (the Min_Toff Works in the Same Way) Current through the Min_Ton adjust resistor can be calculated as: V ref I + R_Ton_min R Ton_min As the same current is used for the ...
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Figure 50. Possible Connection for Min T In LLC applications with a very wide operating frequency range it is necessary to have very short minimum on time and off time ...
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... Miller effect like in hard switching systems because the drain to source voltage is close to zero and its change is negligible. to source voltage − in this case the NCP4303A should be used. capacitance The total driving loss can be calculated using the selected iss ...
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Figure 53. Equivalent Schematic of Gate Drive Circuitry clamp DRV_IC g_ZVS clamp g_ZVS 2 Where the NCP4303x driver ...
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... NCP4303B NCP4303A NCP4303B 100 150 200 250 300 350 400 OPERATING FREQUENCY (kHz) load http://onsemi.com 25 NCP4303A, NCP4303B NCP4303A NCP4303B 150 200 250 300 350 400 450 ...
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... *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 (NCP4303) has patents pendings. 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 ...