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AN2829 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện AN2829
Giải thích chi tiết về linh kiện  Dual step-down controller with auxilary voltages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2829 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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Test setup and performance summary
AN2829
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Figure 13.
1.5 V SMPS efficiency
Figure 14.
1.05 V SMPS efficiency
11.5
Power consumption analysis
To measure the consumption of the device in real working conditions, an external power
supply of +5 V is connected to EXT5V.
The two traces on the following figures show the differentiation in the two input currents.
Once the internal linear regulator is turned on, the device consumption increases.
Figure 15 shows the input current consumption measured at VIN+ (including ISHDN) and
the input device current consumption measured by the VCC pin. Both switching sections
work in forced PWM mode. No load is applied on the outputs.
AM01419v1
Efficiency vs load current OUT1=1,5 V
0
10
20
30
40
50
60
70
80
90
100
0,001
0,010
0,100
1,000
10,000
Load current [A]
SKIP
NASKIP
PWM
AM01420v1
Efficiency vs load curent OUT2=1,05 V
0
10
20
30
40
50
60
70
80
90
100
0,001
0,010
0,100
1,000
10,000
Laod current [A]
SKIP
NASKIP
PWM



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