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NJW4152-AB Datasheet(PDF) 10 Page - New Japan Radio |
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NJW4152-AB Datasheet(HTML) 10 Page - New Japan Radio |
10 / 23 page NJW4152-AB - 10 - Ver.2013-01-23 Description of Block Features (Continued) PWM Comparator Section (PWM) This section controls the switching duty ratio. PWM comparator receives the signal of the error amplifier and the triangular wave, and controls the duty ratio between 0% and 100%. The timing chart is shown in Fig.1. SW pin FB pin Voltage ON OFF OSC Waveform (IC internal) Maximum duty: 100% Fig. 1. Timing Chart PWM Comparator and SW pin Power MOSFET (SW Output Section) The power is stored in the inductor by the switch operation of built-in power MOSFET. The output current is limited to 1.4A(min.)@AB version by the overcurrent protection function. In case of step-down converter, the forward direction bias voltage is generated with inductance current that flows into the external regenerative diode when MOSFET is turned off. The SW pin allows voltage between the PV+ pin and the SW pin up to +45V. However, you should use an Schottky diode that has low saturation voltage. When the power supply voltage decreases, ON resistance rises. Because a dropout voltage in the MOSFET becomes large if an output current is large, please be careful about input-output differential voltage of the application. Power Supply, GND pin (V+, PV+ and GND) In line with switching element drive, current flows into the IC according to frequency. If the power supply impedance provided to the power supply circuit is high, it will not be possible to take advantage of IC performance due to input voltage fluctuation. Therefore insert a bypass capacitor close to the V+ pin – the GND pin connection in order to lower high frequency impedance. Technical Information NJW4152-AB Application Manual |
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