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參數(shù)資料
| 型號(hào)： | MAX1980 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter |
| 中文描述： | Quick-PWM從控制器，帶有驅(qū)動(dòng)禁止功能，用于多相DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 26/33頁(yè) |
| 文件大?。?/td> | 1153K |
| 代理商： | MAX1980 |
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M
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
26
______________________________________________________________________________________
limit allows the use of fewer output capacitors and
reduces power consumption under load.
For a conventional (nonvoltage-positioned) circuit, the
total voltage change is:
V
P-P
1 = 2
(ESR
COUT
I
LOAD
) + V
SAG
+ V
SOAR
where V
SAG
and V
SOAR
are defined in Figure 9. Setting
the converter to regulate at a lower voltage when under
load allows a larger voltage step when the output cur-
rent suddenly decreases (Figure 8). So the total voltage
change for a voltage-positioned circuit is:
V
P-P
2 = (ESR
COUT
I
LOAD
) + V
SAG
+ V
SOAR
where V
SAG
and V
SOAR
are defined in the
Design
Procedure
section. Since the amplitudes are the same
for both circuits (V
P-P
1 = V
P-P
2), the voltage-positioned
circuit tolerates twice the ESR. Since the ESR specifica-
tion is achieved by paralleling several capacitors, fewer
units are needed for the voltage-positioned circuit.
An additional benefit of voltage positioning is reduced
power consumption at high load currents. Since the
output voltage is lower under load, the CPU draws less
current. The result is lower power dissipation in the
CPU, although some extra power is dissipated in
R
SENSE
. For a nominal 1.6V, 22A output (R
LOAD
=
72.7m
), reducing the output voltage 2.9% gives an
output voltage of 1.55V and an output current of 21.3A.
Given these values, CPU power consumption is
reduced from 35.2W to 33.03W. The additional power
consumption of R
SENSE
is:
50mV x 21.3A = 1.06W,
which results in an overall power savings of:
35.2W - (33.03W + 1.06W) = 1.10W.
In effect, 2.2W of CPU dissipation is saved and the
power supply dissipates much of the savings, but both
the net savings and the transfer of dissipation away
from the hot CPU are beneficial. Effective efficiency is
defined as the efficiency required of a nonvoltage-posi-
tioned circuit to equal the total dissipation of a voltage-
positioned circuit for a given CPU operating condition.
Calculate effective efficiency as follows:
1) Start with the efficiency data for the positioned cir-
cuit (V
IN
, I
IN
, V
OUT
, I
OUT
).
2) Model the load resistance for each data point:
R
LOAD
= V
OUT
/ I
OUT
3) Calculate the output current that would exist for each
R
LOAD
data point in a nonpositioned application:
I
NP
= V
NP
/ R
LOAD
where V
NP
= 1.6V (in this example).
4) Calculate effective efficiency as:
Effective efficiency = (V
NP
I
NP
) / (V
IN
I
IN
) = cal-
culated nonpositioned power output divided by the
measured voltage-positioned power input.
5) Plot the efficiency data point at the nonpositioned
current, I
NP
.
The effective efficiency of voltage-positioned circuits is
shown in the
Typical Operating Characteristics
.
V
OUT
ESR VOLTAGE STEP
(I
STEP
x R
ESR
)
CAPACITIVE SOAR
(dV/dt = I
OUT
/C
OUT
)
RECOVERY
CAPACITIVE SAG
(dV/dt = I
OUT
/C
OUT
)
I
LOAD
Figure 9. Transient Response Regions
B
1.4V
1.4V
A
A. CONVENTIONAL CONVERTER (50mV/div)
B. VOLTAGE-POSITIONED OUTPUT (50mV/div)
VOLTAGE POSITIONING THE OUTPUT
Figure 8. Voltage Positioning the Output
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1980EGP | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1980EGP-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1980ETP | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1980ETP+ | 功能描述:DC/DC 開關(guān)控制器 PWM Slave Controller w/Driver Disable RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1980ETP+T | 功能描述:DC/DC 開關(guān)控制器 PWM Slave Controller w/Driver Disable RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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