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NCP1589DMNTWG Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP1589DMNTWG Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 8 page NCP1589D http://onsemi.com 7 conduction mode. The output frequency can be determined by the following equation: FSW + k1 Ramp_slope Vout R9 R10)R9 Vin Vramp ) Voffset 1 1 ) k2 Vout Vin (eq. 2) Where k1, k2 is an internal trimmed value; by default, k1 = 1, k2 = 0, Ramp_slope = 0.5 V/ ms, Vramp = 1.5 V, Voffset = 20 mV. Light Load Operation In continuous current conduction mode, the operating frequency of the NCP1589D is almost constant. In light load, it runs in a discontinuous current mode with a scaled-down frequency as a function of the load current. Internal zero current detection threshold will change adaptively to ensure the minimum amount of diode conduction period to further reduce the converter power consumption in the light load condition. Feedback Voltage The NCP1589D allows the output voltage to be adjusted from 0.8 V to 5 V via an external resistor divider network (R1, R4 in Figure 1). The controller will try to maintain 0.8 V at the FB pin. Thus, if a resistor divider circuit was placed across the feedback pin to Vout, the controller will regulate the output voltage in proportion to the resistor divider ratio in order to maintain 0.8 V at the FB pin. The relation between the resistor divider network and the output voltage is show in the following equation: R4 + R1 Vref Vout * Vref + R1 0.8 V Vout * 0.8 V (eq. 3) Figure 4. Typical Startup Sequence VCC COMP LG UG VOUT FB PGOOD Internal UVLO Fault 1.3 V 0.8 V NORMAL Soft−Start Time OCP Programming Time POR 4.4 V 4.0 V |
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