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UPS1602 Datasheet(PDF) 8 Page - Unisonic Technologies |
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UPS1602 Datasheet(HTML) 8 Page - Unisonic Technologies |
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8 / 12 page  UPS1602 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 8 of 12 www.unisonic.com.tw QW-R119-016.D FUNCTIONAL DESCRIPTION(Cont.) (5) Constant Output Power Limit When the SENSE voltage, across the sense resistor RS, reaches the threshold voltage, around 1V, 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 guarantee the output power is a constant for universal input AC voltage, there is a dynamic peak limit circuit to compensate the system delay TD-OC that the system delay brings on. IPEAK-MAX=0.8V/RSENSE(VIN=264VAC) ,IPEAK-MAX=1V/RSENSE(VIN=85VAC). This proprietary 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. - UPS1602_12 |
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Similar Description - UPS1602_12 |
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