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| 型号： | MAX8810AETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/50页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWM W/MOSFET 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 控制器，Intel VR10、VR11 |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 管件 |
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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM
Controllers with Integrated Dual MOSFET Drivers
The DC gain of the voltage-error amplifier is equal to
g MV x R COMP . From the previous equations it is clear
that the output-voltage droop can be accurately pro-
grammed if the DC gain of the voltage-error amplifier is
RA 2 ALGORITHM
set to be a finite value. As the output current increases,
V C increases and, consequently, V OUT decreases.
R SENSE x (I OUT / N)
g MA
R SENSE x (I OUT / N)
Define the output-droop resistance, R DROOP , as:
R DROOP =
( V DAC ? V OUT )
I OUT
G CA
g MB
V C
then R DROOP can be expressed as:
R DROOP =
R SENSE × G CA
N × g MV × R COMP
1/S
Since G CA and g MV are constants, R DROOP is solely
determined by R COMP when R SENSE and N are chosen.
Peak current-mode control with finite gain is the sim-
plest way to achieve the output-voltage droop without
introducing a separate current loop, which is the case
for voltage-mode control. Therefore, the response time
V OUT
g MV
V C
PWM
COMPARATOR
of the output-voltage droop is the same as the voltage-
feedback loop, resulting in fast output-voltage-droop
transient response and less output capacitance than
solutions using voltage-mode control.
V DAC
VOLTAGE-
ERROR AMPLIFIER
R COMP
Other features offered by peak-current-mode control
are excellent line regulation and inherent current shar-
ing between phases. Standard peak-current-mode con-
trol does have one disadvantage in that current
matching between phases is impacted by the inductor
mismatch (tolerance) between phases. Because only
the current peak is controlled, any mismatch in the
inductor value between two phases creates an inductor
ripple current mismatch, which, in turn, creates a DC
current mismatch between those two phases.
Tolerance mismatch between the current-sense capac-
itors used in DCR current sensing creates the exact
same DC current mismatch as an inductor mismatch.
Maxim’s proprietary RA 2 technology addresses this
issue by averaging out the inductor ripple current indi-
vidually at each phase, as shown in Figure 7. The rapid
active average circuitry learns the peak-to-peak ripple
current of each phase in 5 to 10 switching cycles and
then biases the peak current signal down by half of the
peak-to-peak ripple current, consequently eliminating
the impact of both output inductance and DCR current-
sense capacitance variations. Since the rapid active
Figure 7. Implementation of the Rapid Active Averaging (RA 2 )
Algorithm
average circuitry is not part of the current-loop path, it
does not slow down the transient response.
Programming the Output Offset Voltage
According to the Intel VRD specifications, the output
voltage at no load cannot exceed the voltage specified
by the VID code, including the initial set tolerance, rip-
ple voltage, and other errors. Therefore, the actual out-
put voltage should be biased lower to compensate for
these errors. For the MAX8809A, the output-voltage off-
set is created through a resistor-divider that is connect-
ed between REF and GND, with the center tap
connected to COMP as shown in Figure 8. This resistor-
divider also sets the output load-line. The MAX8810A
contains a BUF output that makes the output-voltage
offset setting independent of the output load-line. To
program the output-voltage offset, connect a resistor
between COMP and GND. A resistor between BUF and
COMP sets the output load-line. See the Loop
Compensation Design section for details on setting the
output-voltage offset.
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8810AETM+ | 功能描述:电流型 PWM 控制器 VRD11/10 K8 Rev. F 2/3/4-Phase PWM Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8810AETM+T | 功能描述:电流型 PWM 控制器 VRD11/10 K8 Rev. F 2/3/4-Phase PWM Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8811EEE+ | 功能描述:功率驱动器IC High-Speed Dual Phase Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX8811EEE+T | 功能描述:功率驱动器IC High-Speed Dual Phase Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX8814ETA+ | 制造商:Maxim Integrated Products 功能描述:CHGR LI-ION/LI-POL 570MA 4.2V 8TDFN EP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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