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AS3689 bảng dữ liệu(PDF) 9 Page - ams-OSRAM AG |
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AS3689 bảng dữ liệu(HTML) 9 Page - ams-OSRAM AG |
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9 / 72 page ![]() AS3689 austriami crosyst ems Datasheet, Confidential www.austriamicrosystems.com (mlg, ptr) Revision 1.0.2 / 20070115 7 - 70 Figure 7 – Current Sink CURR4x vs. VBAT 0 5 10 15 20 25 30 35 40 45 0,0 0,5 1,0 1,5 2,0 V(CURR41) [V] CURR41=38.25mA CURR41=4.8mA Figure 8 – RGB Current Sinks RGBx vs. VBAT 7 Detailed Functional Description 7.1 Analog LDO The LDO is a general purpose LDO and the output pin is shared with the current source (sink) connected to RGB3. The design is optimized to deliver the best compromise between quiescent current and regulator performance for battery powered devices. Stability is guaranteed with ceramic output capacitors (see Figure 3) of 1µF ±20% (X5R) or 2.2µF +100/-50% (Z5U). The low ESR of these capacitors ensures low output impedance at high frequencies. The low impedance of the power transistor enables the device to deliver up to 150mA even at nearly discharged batteries without any decrease in performance. The LDO is off by default after startup (apply voltage on VDD_GPIO) 0 5 10 15 20 25 30 35 40 45 0,0 0,5 1,0 1,5 2,0 V(RGB1) [V] RGB1=38.25mA RGB1=4.8mA |
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