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参数资料
| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/32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
The loop-transfer function is given by:
CCS Loop Compensation
The simplified schematic in Figure 11 is sufficient to
LTF = GM OUT × A CSI × RS 2 × GMI
R OGMI
1 + sR OGMI × C CI
describe the operation of the MAX8731A when the
input current-limit loop (CCS) is in control. Since the
output capacitor’s impedance has little effect on the
GM OUT =
This describes a single-pole system. Since:
1
A CSI × RS 2
the loop-transfer function simplifies to:
response of the input current-limit loop, only a single
pole is required to compensate this loop. A CSS is the
internal gain of the current-sense resistor; RS1 = 10m Ω
in the typical application circuits. R OGMS is the equiva-
lent output impedance of the GMS amplifier, which is
greater than 10M Ω . GMS is the charge-current amplifier
LTF = GMI
R OGMI
1 + sR OGMI × C CI
transconductance = 1μA/mV. GM IN is the DC-DC con-
verter ’s input-referred transconductance = (1/D) x
GM OUT = (1 / D) x 5A/V.
The crossover frequency is given by:
The loop-transfer function is given by:
f CO _ CI =
GMI
2 π C CI
LTF = GM IN × A CSS × RSI × GMS
R OGMS
1 + SR OGMS × C CS
For stability, choose a crossover frequency lower than
1/10 the switching frequency:
Since:
GM IN =
1
A CSS × RS 2
C CI > 10 × GMI / (2 π f OSC ) = 4nF, for a 400kHz switch-
ing frequency.
the loop-transfer function simplifies to:
Values for C CI greater than 10 times the minimum value
can slow down the current-loop response. Choosing C CI
= 10nF yields a crossover frequency of 15.9kHz. Figure
10 shows the Bode plot of the current-loop frequency
response using the values calculated above.
LTF = GMS
R OGMS
1 + SR OGMS × C CS
100
80
MAG
PHASE
0
ADAPTER
INPUT
CSSP
60
InputCurrent( )
CSS
RS1
40
20
-45
GMS
CSSI
0
-20
CCS
GM IN
-40
0.1
10
1k
FREQUENCY (Hz)
100k
-90
C CS
R OGMS
SYSTEM
LOAD
Figure 10 . CCI Loop Response
Figure 11 . CCS Loop Diagram
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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