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UPS601 Datasheet(PDF) 8 Page - Unisonic Technologies |
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UPS601 Datasheet(HTML) 8 Page - Unisonic Technologies |
8 / 12 page UPS601 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 8 of 12 www.unisonic.com.tw QW-R119-003.G FUNCTIONAL DESCRIPTION(Cont.) (5) Constant Output Power Limit When the SENSE voltage, across the sense resistor RS, reaches the threshold voltage, around 0.8V, the output GATE drive will be turned off after a small propagation delay tD. This propagation delay will introduce an additional current proportional to tD×VIN/Lp. Since the propagation delay is nearly constant regardless of the input line voltage VIN. Higher input line voltage will result in a larger additional current and hence the output power limit is also higher than that under low input line voltage. To compensate this variation for wide AC input range, the threshold voltage is adjusted by the VIN current. Since VIN pin is connected to the rectified input line voltage through a resistor RVIN, a higher line voltage will generate higher VIN current into the VIN pin. The threshold voltage is decreased if the VIN current is increased. Smaller threshold voltage, forces the output GATE drive to terminate earlier, thus reduce the total PWM turn-on time and make the output power equal to that of low line input. This proprietary internal compensation ensures a constant output power limit for wide AC input voltage from 90VAC to 264VAC. (6) Protection section The IC takes on more protection functions such as OLP, OVP and OTP etc. In case of those failure modes for continual blanking time, the driver is shut down. At the same time, IC enters auto-restart, VCC power on and driver is reset after VCC power on again. OLP After soft-start phase end, IC will shutdown driver if over load state occurs for continual TD-OLP. OLP function will not inactive during soft-start phase. OLP case as followed FIG. 6. The test circuit as followed FIG.8. TD-OLP=5.53×TSS. OVP There are two kinds of OVP circuits, the first OVP function are enabled only when VSS<VSS (DEACT) & VFB>VFB (OLP) during soft-start phase. During above condition, driver will be shutdown if over voltage state occurs (VCC>VOVP1) for continual a blanking time. The first OVP function will not inactive after soft-start phase. The second OVP will shutdown the switching of the power MOSFET whenever VCC>VOVP2. The first OVP case as followed FIG.7. The test circuit as followed FIG.9. FIG.6 OLP case FIG.7 OVP case |
Similar Part No. - UPS601_15 |
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Similar Description - UPS601_15 |
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