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參數(shù)資料
| 型號： | MAX1939 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change |
| 中文描述： | 雙相、臺式機CPU核電源控制器，帶有受控的VID調節(jié) |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 586K |
| 代理商： | MAX1939 |
M
Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
______________________________________________________________________________________
13
While the on-time is set by the input and output voltage,
other factors contribute to the switching frequency. The
on-time guaranteed in the
Electrical Characteristics
is
influenced by switching delays in the external high-side
MOSFET. Resistive losses in the inductor, both MOSFETs,
output capacitor ESR, and PC board copper losses in
the output and ground, tend to raise the switching fre-
quency at higher output currents. Switch dead-time can
also increase the effective on-time, reducing the
switching frequency. This effect occurs when the
inductor current reverses at light or negative load cur-
rents. With reversed inductor current, the inductor
’
s
V
OUT
(V)
MAX1938
1.850
1.825
1.800
1.775
1.750
1.725
1.700
1.675
1.650
1.625
1.600
1.575
1.550
1.525
1.500
1.475
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
Shutdown
VID4
VID3
VID2
VID1
VID0
MAX1937
1.550
1.525
1.500
1.475
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
Shutdown
MAX1939
2.000
1.950
1.900
1.850
1.800
1.750
1.700
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
Shutdown
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
Shutdown
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Table 1. VID Programmed Output Voltage
Note:
In the above table, a zero indicates the VID_ pin is connected to GND or driven low, indicates the VID_ pin is driven high or
not connected.
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