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MC34708 数据表(PDF) 57 Page - Freescale Semiconductor, Inc |
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MC34708 数据表(HTML) 57 Page - Freescale Semiconductor, Inc |
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57 / 159 page  Analog Integrated Circuit Device Data 57 Freescale Semiconductor MC34708 Functional Block Description Figure 14. SW4 Dual Phase Output Mode Block Diagram The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected the regulator will limit the current through cycle by cycle operation and alert the system through the SW4xFAULT SPI bit and issue an SCPI interrupt via the INT pin. SW4A/B has a high output range (2.5 V, 3.15 V) and a low output range (1.2 V – 1.85 V). The SW4A/B output range is set by the PUMS configuration at start-up and cannot be changed dynamically by software. This means that If the PUMS are set to allow SW4A to come up in the high output voltage range, the output can only be changed between 2.5 V or 3.15 V. It cannot be programmed in the low output range. If software sets the SW4AHI[1:0] = 00 when the PUMS is set to come up in the high voltage range, the output voltage will only go as low as the lowest setting in the high range, which is 2.5 V. If the PUMS are set to start- up in the low output voltage range, the voltage is controlled through the SW4x[4:0] bits by software, it cannot be programmed into the high voltage range. When changing the voltage in either the high or low voltage range, the regulator should be forced into PWM mode to change the voltage. Table 44. SW4A/B Output Voltage Select SW4xHI[1:0] Set point selected by Output Voltage 00 SW4x[4:0] See Table 45 01 SW4xHI[1:0] 2.5 V 10 SW4xHI[1:0] 3.15 V 11 Invalid Invalid Driver Controller EA Z1 Z2 Internal Compensation SW4IN SW4ALX SW4AFB ISENSE COSW4A CINSW4A LSW4A SPI Interface GNDSW4A SW4 SW4AMODE SW4AFAULT VREF DAC SPI BP Driver Controller EA Z1 Z2 Internal Compensation SW4BIN SW4BLX SW4BFB ISENSE COSW4B CINSW4B LSW4B GNDSW4B SW4BMODE SW4BFAULT VREF DAC SPI BP SW4CFG VCORE DSW4A DSW4B |
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