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AS3722 bảng dữ liệu(PDF) 35 Page - ams-OSRAM AG |
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AS3722 bảng dữ liệu(HTML) 35 Page - ams-OSRAM AG |
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35 / 199 page  Page 34 ams Datasheet Document Feedback [v1-01] 2015-Sep-07 AS3722 − Detailed Descriptions- Power Management Functions Figure 28: SD0 DC/DC Buck Controller 32A Block Diagram SD0 DC/DC Buck Controller: Shows basic connection of the SD0 controller to four external power stages (AS3729B) for 32A output current. Mode Settings Low Ripple, Low Noise Operation Bit settings: sdX_low_noise=1 In this mode there is no minimum coil current necessary before switching off the PMOS. As long as the load current is superior to the ripple current the device operates in continuous mode. When the load current gets lower, the discontinuous mode is triggered. As result, the auto-zero comparator stops the NMOS conduction to avoid load discharger and the duty cycle is reduced down to tmin_on to keep the regulation loop stable. This results in a very low ripple and noise, but decreased efficiency, at light loads, especially at low input to output voltage differences. FB_SDx Vout (0.4-1.5V@32A) DVM, 10mV steps SD controller TEMP1_SDx CTRL1_SDx CTRL2_SDx FB_SDx TEMP2_SDx CTRL3_SDx CTRL4_SDx TEMP3_SDx CTRL5_SDx CTRL6_SDx TEMP4_SDx CTRL7_SDx CTRL8_SDx TEMP CTRL1 CTRL2 LX2 LX1 0.47uH 0.47uH 47uF AS3729B VSUP 10uF PVSS 47uF VSUP 10uF TEMP CTRL1 CTRL2 LX2 LX1 0.47uH 0.47uH 47uF AS3729B VSUP 10uF PVSS 47uF VSUP 10uF TEMP CTRL1 CTRL2 LX2 LX1 0.47uH 0.47uH 47uF AS3729B VSUP 10uF PVSS 47uF VSUP 10uF TEMP CTRL1 CTRL2 LX2 LX1 0.47uH 0.47uH 47uF AS3729B VSUP 10uF PVSS 47uF VSUP 10uF |
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