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参数资料
| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/32页 |
| 文件大小： | 0K |
| 描述： | IC SMBUS LVL2 BATT CHRGR 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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SMBus Level 2 Battery Charger
with Remote Sense
Compensation
The charge-voltage and charge-current regulation
loops are independent and compensated separately at
the CCV, CCI, and CCS.
greater than 10M Ω . The voltage amplifier transconduc-
tance, GMV = 0.125μA/mV. The DC-DC converter
transconductance is dependent upon the charge-cur-
rent sense resistor RS2:
CCV Loop Compensation
The simplified schematic in Figure 7 is sufficient to
describe the operation of the MAX8731A when the volt-
GM OUT =
1
A CSI × RS 2
( 1 + sC OUT × R ESR )( 1 + sC CV × R CV )
( 1 + sC CV OGMV OUT L )
× R
)( 1 + sC
× R
age loop (CCV) is in control. The required compensa-
tion network is a pole-zero pair formed with C CV and
R CV . The zero is necessary to compensate the pole
formed by the output capacitor and the load. R ESR is
the equivalent series resistance (ESR) of the charger
output capacitor (C OUT ). R L is the equivalent charger
output load, where R L = Δ V BATT / Δ I CHG . The equiva-
lent output impedance of the GMV amplifier, R OGMV , is
FBS_
GM OUT
where A CSI = 20V/V, and RS2 = 10m Ω in the typical
application circuits, so GM OUT = 5A/V. The loop-trans-
fer function is given by:
LTF = GM OUT × R L × GMV × R OGMV
×
The poles and zeros of the voltage loop-transfer function
are listed from lowest frequency to highest frequency in
Table 5 .
Near crossover C CV is much lower impedance than
R ESR
R L
R OGMV . Since C CV is in parallel with R OGMV , C CV dom-
inates the parallel impedance near crossover.
CCV
GMV
C OUT
Additionally, R CV is much higher impedance than C CV
and dominates the series combination of R CV and C CV ,
so near crossover:
R CV
C CV
R OGMV
ChargeVoltage( )
R OGMV × (1 + sC CV × R CV )
( 1 + sC CV × R OGMV )
? R CV
Figure 7 . CCV Loop Diagram
Table 5 . CCV Loop Poles and Zeros
NAME
EQUATION
DESCRIPTION
CCV Pole
f P _ CV =
1
2 π R OGMV × C CV
Lowest frequency pole created by C CV and GMV’s finite output resistance.
Voltage-loop compensation zero. If this zero is at the same frequency or
CCV Zero
f Z _ CV =
1
2 π R CV × C CV
lower than the output pole f P_OUT , then the loop-transfer function
approximates a single-pole response near the crossover frequency. Choose
C CV to place this zero at least 1 decade below crossover to ensure
adequate phase margin.
Output
Pole
Output
Zero
f P _ OUT =
f P _ OUT =
1
2 π R L × C OUT
1
2 π R L × C OUT
Output pole formed with the effective load resistance R L and the output
capacitance C OUT . R L influences the DC gain but does not affect the
stability of the system or the crossover frequency.
Output ESR Zero. This zero can keep the loop from crossing unity gain if
f Z_OUT is less than the desired crossover frequency; therefore, choose a
capacitor with an ESR zero greater than the crossover frequency.
24
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相关代理商/技术参数 |
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|---|---|
| MAX8731AEVKIT+ | 功能描述:电源管理IC开发工具 MAX8731A Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8731AEVSYS | 功能描述:电池管理 Evaluation System for the MAX8731A (includes an EVKit and the Maxim SMBUSMON2 board) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8731ETI+ | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Rail/Tube |
| MAX8731ETI+T | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Tape and Reel |
| MAX8731EVKIT | 功能描述:电池管理 SMBus Level 2 Battery Charger with Remote Sense RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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