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NCP1392BDR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1392BDR2G Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 19 page  NCP1392B http://onsemi.com 9 Irt (mA) Figure 21. Irt and Appropriate Frequency 0.2 290 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 240 190 140 90 40 APPLICATION INFORMATION The NCP1392 is primarily intended to drive low cost half bridge applications and especially resonant half bridge applications. The IC includes several features that help the designer to cope with resonant SPMS design. All features are described thereafter: • Wide Operating Frequency Range: The internal current controlled oscillator is capable to operate over wide frequency range up to 250 kHz. Minimum frequency accuracy is $3%. • Fixed Dead−Time: The internal dead−time helping to fight with cross conduction between the upper and lower power transistors. Three versions with different dead time values are available to cover wide range of applications. • 100 ms PFC Timer: Fixed delay is placed to IC operation whenever the driver restarts (VCCON or BO_OK detect events). This delay assures that the bulk voltage will be stabilized in the time the driver provides pulses on the outputs. Another benefit of this delay is that the soft start capacitor will be full discharged before any restart. • Brown−Out Detection: The BO input monitors bulk voltage level via resistor divider and thus assures that the application is working only for wanted bulk voltage band. The BO input sinks current of 18.2 mA until the VrefBO threshold is reached. Designer can thus adjust the bulk voltage hysteresis according to the application needs. • Non−Latched Enable Input: The enable comparator input is connected in parallel to the BO terminal to allow the designer stop the output drivers when needed. There is no PFC delay when enable input is released so skip mode for resonant SMPS applications and dimming for light ballast applications are possible. • Internal VCC Clamp: The internal zener clamp offers a way to prepare passive voltage regulator to maintain VCC voltage at 16 V in case the controller is supplied from unregulated power supply or from bulk capacitor. • Low Startup Current: This device features maximum startup current of 50 mA which allows the designer to use high value startup resistor for applications when driver is supplied from the auxiliary winding. Power dissipation of startup resistor is thus significantly reduced. Current Controlled Oscillator The current controlled oscillator features a high−speed circuitry allowing operation from 50 kHz up to 500 kHz. However, as a division by two internally creates the two Q and Q outputs, the final effective signal on output Mlower and Mupper switches between 25 kHz and 250 kHz. The VCO is configured in such a way that if the current that flows out from the Rt pin increases, the switching frequency also goes up. Figure 22 shows the architecture of this oscillator. |
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