AS3722 datasheet(34/198 Pages) AMSCO

34 / 198 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

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

47uF

AS3729B

VSUP

10uF

PVSS

47uF

VSUP

10uF

TEMP

CTRL1

CTRL2

LX2

LX1

0.47uH

47uF

AS3729B

VSUP

10uF

PVSS

47uF

VSUP

10uF

TEMP

CTRL1

CTRL2

LX2

LX1

0.47uH

47uF

AS3729B

VSUP

10uF

PVSS

47uF

VSUP

10uF

TEMP

CTRL1

CTRL2

LX2

LX1

0.47uH

47uF

AS3729B

VSUP

10uF

PVSS

47uF

VSUP

10uF

AS3722 数据表(PDF) 34 Page - ams AG

AS3722 数据表(HTML) 34 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

AS3722 数据表(PDF) 34 Page - ams AG

AS3722 数据表(HTML) 34 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载