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STBB1XX 数据表(PDF) 9 Page - STMicroelectronics |
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STBB1XX 数据表(HTML) 9 Page - STMicroelectronics |
9 / 20 page STBB1xx Detailed description 9/20 6 Detailed description 6.1 General description The STBB1 is a high efficiency dual mode buck-boost switch mode converter. Thanks to the internal 4 switches, 2 P-channel and 2 N-channel, and its particular control technique it is able to deliver e well regulated output voltage with a variable input voltage which can be higher, equal or lower than the desired output voltage. This solves most of the power supply problems that circuit designers face when dealing with battery powered equipment. The controller uses an average current mode technique in order to obtain good stability in all possible conditions of input voltage, output voltage and output current. In addition the peak inductor current is monitored in order to avoid saturation of the coil. The STBB1 can work in two different modes: PWM mode or power save mode. In the first case the device operates with a fixed oscillator frequency in all line/load conditions. This is the suitable condition to obtain the maximum dynamic performances. In the second case the device operates in burst mode allowing a drastic reduction of power consumption. Top-class line and load transients are achieved thanks to feed-forward technique and due to the innovative control method specifically designed to optimize the performances in the buck-boost region where input voltage is very close to the output voltage. The STBB1 is self protected by short circuit, over-temperature and adjustable version. Under voltage lockout and soft start guarantee proper operation during start-up. Input voltage and ground connections are split in power and signal pins. This allows reducing internal disturbances when the 4 internal switches are working. The switches bridge is connected between VIN and PGND pins while all logic blocks are connected between VINA and GND. 6.2 Dual mode operation The STBB1 works in PWM or in power save (PS) mode according to the different operating conditions. If the Mode pin is pulled high the device works always in PWM mode even at light or no load. In this condition STBB1 provides the best dynamic performances. If MODE pin is logic low, the STBB1 operation changes according to the average input current handled by the device. At low average current the STBB1 enters in PS mode allowing very low power consumption and thus obtaining very good efficiency event at light load. When the average current increases, the device automatically switches to PWM mode in order to deliver the power needed by the load. In PS mode the STBB1 implements a burst mode operation. If the output voltage increases above its nominal value the device stops switching. As soon the VOUT falls below the nominal value the device starts switching again with a programmed average current higher than the one needed by the load. Figure 8 in Section 7 shows PS mode operation areas vs output current in typical application conditions. |
类似零件编号 - STBB1XX |
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类似说明 - STBB1XX |
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