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NCP1238AD65R2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1238AD65R2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 30 page NCP1238 http://onsemi.com 11 At startup, the current source turns on when the voltage on the HV pin is higher than VHV(min), and turns off when VCC reaches VCC(on). It turns on again when VCC reaches VCC(min). This sequence repeats until the input voltage is high enough to ensure a proper startup, i.e. when VHV reaches VHV(start). The switching actually starts the next time VCC reaches VCC(on), as shown in Figure 5. Even though the DSS is able to maintain the VCC voltage between VCC(on) and VCC(min) by turning the HV startup current source on and off, it can only be used in light load conditions, otherwise the power dissipation on the die would be too high. As a result, an auxiliary voltage source is needed to supply VCC during normal operation. The DSS is useful to keep the controller alive when no switching pulses are delivered, e.g. in a brown−out condition, or to prevent the controller from stopping during load transients when the VCC might drop below VCC(off). Figure 5. Startup Timing Diagram time VHV time VCC time DRV VHV(start) VHV(min) VCC(on) VCC(min) VCC(inhibit) HV current source = Istart1 HV current source = Istart2 Waits next VCC(on) before starting |
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