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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UCS1002-2 датащи(PDF) 51 Page - Microchip Technology |
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UCS1002-2 датащи(HTML) 51 Page - Microchip Technology |
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51 / 114 page  Programmable USB Port Power Controller with Charger Emulation Datasheet SMSC UCS1002 51 Revision 1.4 (07-16-13) DATASHEET Figure 7.2 shows operation of current limits while using CC mode. Unlike trip mode, once IBUS current exceeds ILIM, operation continues at a reduced voltage and increased current. Note that the shaded area representing the USB 2.0 specified VBUS range is now restricted to an upper current limit of IBUS_R2MIN. Note that the UCS1002 will heat up along each load line as voltage decreases. If the internal temperature exceeds the TREG or TTSD thresholds, the port power switch will open. Also note that when the VBUS voltage is brought low enough (below VBUS_MIN), the port power switch will open. 7.3 Thermal Management and Voltage Protection 7.3.1 Thermal Management The UCS1002 utilizes two-stage internal thermal management. The first is named dynamic thermal management and the second is a fixed thermal shutdown. Figure 7.2 Constant Current Limiting (Variable Slope) Operation 5 4 3 2 1 0.5 1.0 1.5 2.0 2.5 5.25 4.75 0 0 0.9 1.2 1.2 1.0 0.9 0.5 1.5 IBUS_R2MIN 1.8 1.8 2.0 2.5 IBUS (Amps) ILIM (Amps) = ILIM’s Constant resistance IBUS operation line 1 (ILIM = 0.5 A) Constant resistance IBUS operation line 5 (ILIM = 1.5 A*) CC Mode - Power switch current increases as voltage decreases when ILIM is exceeded following constant resistance lines *1.5 A limit reduced by -3.5% internally |
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