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| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/29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
where:
The loop transfer function is given by:
V BATT = 16.8V
GMV = 0.125μA/mV
GM OUT = 2.22A/V
LTF = GM OUT × A CSI × RS × GMI
R OGMI
1 + sR OGMI × C CI
C OUT = 10μF
that describes a single-pole system. Since:
f OSC = 350kHz (minimum occurs at V IN = 19V and
V BATT = 16.8V)
R L = 0.2 ?
GM OUT =
1
A CSI × RS
f CO-CV = 45kHz
the loop-transfer function simplifies to:
To ensure that the compensation zero adequately can-
cels the output pole, select f Z_CV ≤ f P_OUT :
C CV ≥ (R L / R CV ) C OUT
LTF = GMI
R OGMI
1 + sR OGMI × C CI
C CV ≥ 200pF
Figure 5 shows the Bode plot of the voltage-loop fre-
The crossover frequency is given by:
quency response using the values calculated above.
CCI Loop Compensation
The simplified schematic in Figure 6 is sufficient to
f CO _ CI =
GMI
2 π C CI
C CI >
= 4 nF
describe the operation of the MAX8730 when the bat-
tery current loop (CCI) is in control. Since the output
capacitor’s impedance has little effect on the response
of the current loop, only a simple single pole is required
to compensate this loop. A CSI is the internal gain of the
current-sense amplifier. RS2 is the charge-current-
sense resistor (30m ? ). R OGMI is the equivalent output
impedance of the GMI amplifier, which is greater than
10M ? . GMI is the charge-current amplifier transcon-
ductance = 1μA/mV. GM OUT is the DC-DC converter
transconductance = 2.22A/V.
For stability, choose a crossover frequency lower than
1/10 of the switching frequency:
10 x GMI
2 π x C CI
Values for C CI greater than 10 times the minimum value
may slow down the current-loop response. Choosing
C CI = 10nF yields a crossover frequency of 15.9kHz.
Figure 7 shows the Bode plot of the current-loop fre-
quency response using the values calculated above.
80
0
CSIP
CSIN
GM OUT
60
RS2
40
20
0
-20
MAG
-45
-90
CCI
GMI
CSI
-40
PHASE
-135
C CI
R OGMI
0.1
1
10
100
1k
10k
100k
1M
ICTL
FREQUENCY (Hz)
Figure 5. CCV Loop Response
Figure 6. CCI Loop Diagram
22
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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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