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| 型号： | MAX8765ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/30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： | 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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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
where R L varies with load according to R L = V BATT /I CHG.
Output zero due to output capacitor ESR:
GM OUT
BATT
f Z _ ESR =
1
2 π R ESR × C OUT
R ESR
R L
The loop transfer function is given by:
CCV
R CV
R OGMV
GMV
REF
C OUT
LTF = GM OUT × R L × GMV × R OGMV ×
( 1 + sC OUT × R ESR )( 1 + sC CV × R CV )
( 1 + sC CV × R OGMV ) ( 1 + sC OUT × R L )
C CV
Assuming the compensation pole is a very low
frequency, and the output zero is a much higher fre-
quency, the crossover frequency is given by:
Figure 5. CCV Loop Diagram
f CO _ CV =
GMV × R CV × GM OUT
2 π C OUT
GM OUT =
f CO _ CV =
GMV × R CV × GM OUT
2 π C OUT
CCV Loop Definitions
Compensation of the CCV loop depends on the para-
meters and components shown in Figure 5. C CV and
R CV are the CCV loop compensation capacitor and
series resistor. 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 = V BATT /
I CHG . The equivalent output impedance of the GMV
amplifier, R OGMV ≥ 10M ? . The voltage amplifier
transconductance, GMV = 0.125μA/mV. The DC-DC
converter transconductance, GM OUT = 3.33A/V:
1
A CSI × RS 2
where A CSI = 20, and RS2 is the charging current-
sense resistor in the Typical Application Circuits.
The compensation pole is given by:
To calculate R CV and C CV values of the circuit of Figure 2:
Cells = 4
C OUT = 22μF
V BATT = 16.8V
I CHG = 2.5A
GMV = 0.125μA/mV
GM OUT = 3.33A/V
R OGMV = 10M ?
f = 400kHz
Choose crossover frequency to be 1/5th the
MAX1908’s 400kHz switching frequency:
= 80 kHz
Solving yields R CV = 26k ? .
Conservatively set R CV = 1k ? , which sets the crossover
f P _ CV =
1
2 π R OGMV × C CV
frequency at:
f CO_CV = 3kHz
Choose the output-capacitor ESR so the output-capacitor
The compensation zero is given by:
zero is 10 times the crossover frequency:
f Z _ CV =
1
2 π R CV × C CV
R ESR =
1
2 π × 10 × f CO _ CV × C OUT
= 0 . 24 ?
f P _ OUT =
The output pole is given by:
1
2 π R L × C OUT
22
f Z _ ESR =
1
2 π R ESR × C OUT
= 2 . 412 MHz
Maxim Integrated
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| MAX876ACPA | 功能描述:基准电压& 基准电流 10V Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| MAX876ACPA+ | 功能描述:基准电压& 基准电流 10V Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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