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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UCS1001 датащи(PDF) 38 Page - Microchip Technology |
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UCS1001 датащи(HTML) 38 Page - Microchip Technology |
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38 / 59 page  USB Port Power Controller with Charger Emulation Datasheet Revision 1.2 (05-21-12) 38 SMSC UCS1001 DATASHEET Figure 6.2 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 UCS1001 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, the port power switch will open. 6.3 Thermal Management and Voltage Protection 6.3.1 Thermal Management The UCS1001 utilizes two-stage internal thermal management. The first is named dynamic thermal management and the second is a fixed thermal shutdown. Figure 6.2 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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