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SI9160BQ-T1 Datasheet(PDF) 8 Page - Vishay Siliconix |
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SI9160BQ-T1 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 11 page Si9160 Vishay Siliconix www.vishay.com 8 Document Number: 70029 S-40700—Rev. H, 19-Apr-04 OPERATION OF THE SI9160 BOOST CONVERTER The Si9160 combined with optimized complementary MOSFETs provides the ideal solution to small, high efficiency, synchronous boost power conversion. Optimized for a 1-cell lithium ion, or 3-cell to 4-cell Nickel metal hydride battery, it is capable of switching at frequencies of up to 2 MHz. Combined with the Si6801, a complimentary high-frequency MOSFET, efficiencies of over 90% are easily achieved in a very small area. PWM Controller The Si9160 implements a synchronous voltage mode PWM control topology and is especially designed for battery power conversion. Voltage-mode control results in the most efficient power conversion solution. Figure 1 below illustrates a schematic for a synchronous boost converter with an input range of 2.7 V to 5 V which covers the range of 1-cell LiIon and 3-cell or 4-cell NiMH/NiCd battery input respectively, and an output voltage of 6 V. Note the maximum input voltage is limited to the output voltage for a boost converter. The switching frequency is determined by an external capacitor and resistor connected to Cosc and Rosc pins. The graph on page 5 in the Typical Characteristics section shows the typical Cosc and Rosc values for various switching frequency. Si9160 oscillator frequency can be easily synchronized to external frequency as long as external switching frequency is higher than the internal oscillator frequency. The synchronization circuit is a series resistor and capacitor fed into the Cosc pin of the Si9160. The synchronization pulse should be greater than 1.5 V in amplitude and a near square wave pulsed clock. Figure 1 shows typical values for the synchronization components. Startup Designed to operate with single cell Lithium Ion battery voltage, the Si9160 has an operating range of 2.7 V to 6.0 V. During start-up, the device requires 3.0 V to guarantee proper operation, although it will typically start up at less than 2.2 V. Once powered, Si9160 will continue to operate until the voltage at VDD is 2.7 V; at this point, the battery is basically dead. During start-up, power for the chip is provided by the battery through schottky diode D1 to VDD and VS pins. Once the converter is fully operating, supply power is provided by the converter output through diode D2, which overrides the D1 diode. This self perpetuating method of powering further improves the converter efficiency by utilizing higher gate drive to lower the on-resistance loss of the MOSFET. FIGURE 1. Si9160 Boost Converter ML C4 10 mF 13 Si9160 14 15 16 2 3 4 1 10 11 12 5 6 7 9 8 C11 36 pF R6 12 k C3 R3 DR VDD VS NC DMAX DS COMP PGND FB NI VREF UVLOSET COSC ROSC GND ENABLE C2 0.1 mF C10 0.1 mF R5 100 k C5 0.1 mF R1 10 k C4 0.1 mF C6 22 pF R4 2.2 k C10 0.33 mF 5 6 7 8 2 3 4 1 S2 D1 D2 S1 S1 S2 G1 G2 C8 5600 pF R9 100 W R10 3.6 k R11 1.2 k C9 0.1 mF ML C3 10 mF ML C1 10 mF D1 LS4148 D2 LS4148 ML C2 10 mF 4.7 mH Si6801 0.1 mF 2.2 k R2, 270 W SYNC 1-Cell LiIon Power Amplifier |
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