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| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/29页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 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 ~ 28 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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Low-Cost Battery Charger
CCS Loop Compensation
The simplified schematic in Figure 8 is sufficient to
For stability, choose a crossover frequency lower than
1/10 of the switching frequency:
describe the operation of the MAX8730 when the input
current-limit loop (CCS) is in control. Since the output
capacitor’s impedance has little effect on the response
of the input current-limit loop, only a single pole is
C CS = 5 x
GMS
2 π f OSC
x
V IN _ MAX
V BATT _ MIN
required to compensate this loop. A CSS is the internal
gain of the current-sense amplifier, RS1 = 10m ? in the
typical application circuits. R OGMS is the equivalent
output impedance of the GMS amplifier, which is
greater than 10M ? . GMS is the charge-current amplifier
transconductance = 1μA/mV. GM IN is the DC-DC con-
Values for CCS greater than 10 times the minimum
value may slow down the current-loop response exces-
sively. Figure 9 shows the Bode plot of the input cur-
rent-limit-loop frequency response using the values
calculated above.
verter’s input-referred transconductance = GM OUT /D =
2.22A/V/D.
The loop-transfer function is given by:
ADAPTER
LTF = GM IN × A CSS × RSI × GMS
R OGMS
1 + SR OGMS × C CS
INPUT
CSSP
Since GM IN =
1
A CSS × RS 2
CLS
CSS
RS1
CSSI
GMS
the loop-transfer function simplifies to:
LTF = GMS
R OGMS
1 + SR OGMS × C CS
x RS 1 / RS 2
CCS
C CS
R OGMS
GM IN
SYSTEM
The crossover frequency is given by:
LOAD
f CO _ CS =
100
80
GMS
2 π C CS
x
V IN _ MAX
V BATT _ MIN
MAG
PHASE
0
Figure 8. CCI Loop Diagram
100
80
MAG
PHASE
0
60
40
20
0
-20
-45
60
40
20
0
-20
-45
-40
-90
-40
-90
0.1
10
1k
100k
0.1
10
1k
100k
10M
FREQUENCY (Hz)
Figure 7. CCI Loop Response
FREQUENCY (Hz)
Figure 9. CCS Loop Response
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8730EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW COST BATTERY CHARGER - Rail/Tube |
| MAX8731AETI+ | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| MAX8731AETI+T | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| 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 |
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