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参数资料
| 型号： | MAX1980ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 系列： | Quick-PWM™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 50% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 包装： | 管件 |
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Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
1.4V
VOLTAGE POSITIONING THE OUTPUT
A
V OUT
ESR VOLTAGE STEP
(I STEP x R ESR )
CAPACITIVE SOAR
(dV/dt = I OUT /C OUT )
1.4V
A. CONVENTIONAL CONVERTER (50mV/div)
B
CAPACITIVE SAG
(dV/dt = I OUT /C OUT )
RECOVERY
B. VOLTAGE-POSITIONED OUTPUT (50mV/div)
Figure 8. Voltage Positioning the Output
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,
I LOAD
Figure 9. Transient Response Regions
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 .
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1980ETP+ | 功能描述:DC/DC 开关控制器 PWM Slave Controller w/Driver Disable RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1980ETP+T | 功能描述:DC/DC 开关控制器 PWM Slave Controller w/Driver Disable RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1980ETP+TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1980ETP-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1980ETP-TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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