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| 型号： | MAX8810AETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 36/50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
where M LS is the number of MOSFETs in parallel per
phase on the low side. Total power dissipation for the
low side equals the number of phases times the low-
side conduction loss of each phase.
Even though the switching loss is insignificant in the
low-side MOSFETs, R DSON is not the only parameter
that should be considered in selecting the low-side
MOSFETs. Large Miller capacitance (C RSS ) could turn
capacitor ESR zero frequency. To continue to roll off the
gain out to high frequencies at -20dB/decade, the com-
pensation places a pole at the ESR zero frequency. An
RC circuit, R COMP and C COMP , must be connected
from COMP to ground. Calculate R COMP as the parallel
combination of R LL and R OS . The capacitor value can
be found from the following equation once the output
capacitor ESR is known:
on the low-side MOSFETs momentarily when the drain-
to-source voltage goes high at fast slew rates, if the dri-
ver cannot hold the gate low. The ratio of C RSS /C ISS
should be less than 1/10th for the low-side MOSFETs to
C COMP =
R ESR _ CO × C O
R COMP
avoid shoot-through current due to momentary turn-on
of the low-side switch. Adding a resistor between BST_
and C BST_ can slow the high-side MOSFET turn-on.
Similarly, adding a capacitor from the gate to the
source of the high-side MOSFET has the same effect.
However, both methods are at the expense of increas-
ing the high-side switching losses.
where R ESR_CO is the total equivalent series resistance
and C O is the total capacitance of the output capacitors.
Loop Compensation with Integral Feedback
For applications that do not implement droop, it is nec-
essary to compensate the loop using integral feedback.
Looking at the transfer function from inductor current
Loop-Compensation Design
Loop Compensation with Voltage Positioning
Processor power-supply specifications often require
the output voltage to “droop” from its no-load value at a
fixed slope with increasing load current. This slope is
i L (t) to output:
G VI ( ω ) = R OUT ×
1 +
1 +
ω
? ZERO
ω
? POLE
termed the load-line resistance (R O ). Once the current-
sense resistance (R SENSE ), the required load-line resis-
tance, and the output offset voltage (V OS ) are
determined, the values of R LL and R OS (see Figure 8)
are calculated from the following equations:
For the MAX8809A:
The DC gain is the output impedance R OUT :
R OUT = V OUT / I OUT_MAX
A pole and zero are present due to the output capaci-
tance (C O ), output-capacitor ESR (R ESR_CO ), and the
load impedance (R OUT ), as follows:
× ?
? V OS ?
R LL =
g MV
2
1
? N × R O
? R SENSE × G CA
?
?
and :
Ω POLE =
( R OUT
1
+ R ESR _ CO ) × C O
× ?
+ V OS ? ?
R OS =
g MV
2
1
? N × R O
? R SENSE × G CA
?
?
1
20 × 10 6
Ω ZERO =
( R OUT × R ESR _ CO )
( R OUT + R ESR _ CO )
1
× C O
R OS =
i L ( )
v C ( t )
g PWM = =
R OS × R COMP
R COMP = SENSE CA
R × G
For the MAX8810A:
The 1V BUF output simplifies the R OS calculation con-
siderably. R OS and R LL are calculated as:
1
g MV × V OS
R LL =
R OS ? R COMP
where:
N × g MV × R O
The pole due to the load (R OUT ) and output capaci-
tance produces a -20dB/decade slope up to the output-
The transfer function from control voltage v C (t) to induc-
tor current i L (t) is:
t 1
R SENSE × G CA
where R SENSE is the resistance of the current-sense
element, and G CA is the current-sense amplifier gain.
The simplified control-to-output transfer function is then:
G CONTR _ OUTPUT ( ω ) = g PWM × G VI ( ω ) × N
36
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|---|---|
| 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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