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| 型号： | MAX8725ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 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： | 托盘 |
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Multichemistry Battery Chargers with Automatic
System Power Selector
100
0
GM OUT
CSIP
CSIN
80
MAG
PHASE
RS2
60
CSI
40
-45
20
0
CCI
GMI
-20
C CI
R OGMI
-40
0.1
10
1k
100k
-90
ICTL
Figure 7. CCI Loop Diagram
This describes a single-pole system. Since:
FREQUENCY (Hz)
Figure 8. CCI Loop Response
CCS Loop Compensation
GM OUT =
1
A CSI × RS 2
The simplified schematic in Figure 9 is sufficient to
describe the operation of the MAX1909/MAX8725 when
the input current-limit loop (CCS) is in control. Since the
the loop transfer function simplifies to:
output capacitor’s impedance has little effect on the
response of the input current-limit loop, only a single
LTF = GMI
R OGMI
1 + sR OGMI × C CI
pole is required to compensate this loop. A CSS is the
internal gain of the current-sense amplifier. RS1 is the
input current-sense resistor; RS1 = 10m Ω in the typical
The crossover frequency is given by:
operating circuits. R OGMS is the equivalent output
impedance of the GMS amplifier, which is greater than
f CO _ CI =
GMI
2 π C CI
10M Ω . GMS is the input current amplifier transconduc-
tance = 1μA/mV. GM IN is the DC-DC converter’s input-
referred transconductance = (1/D) GM OUT = (1/D)
3.3A/V.
For stability, choose a crossover frequency lower than
1/10th of the switching frequency:
C CI = GMI / (2 π f O_CI )
Choosing a crossover frequency of 30kHz and using the
ADAPTER
INPUT
component values listed in Figure 1 yields C CI > 5.4nF.
Values for C CI greater than 10 times the minimum value
may slow down the current-loop response excessively.
Figure 8 shows the Bode plot of the current-loop fre-
quency response using the values calculated above.
CLS
CSS
CSSP
RS1
CSSN
GMS
CCS
GM IN
C CS
R OGMS
SYSTEM
LOAD
Figure 9. CCS Loop Diagram
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8725ETI+ | 功能描述:电池管理 Multichemistry 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 |
| MAX8725ETI+T | 功能描述:电池管理 Multichemistry 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 |
| MAX8725ETI-T | 功能描述:电池管理 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 |
| MAX8725EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX8725 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 |
| MAX8726EUE | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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