参数资料
型号: MAX8765ETI+T
厂商: Maxim Integrated Products
文件页数: 23/30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)
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
The 22μF ceramic capacitor has a typical ESR of
0.003 ? , which sets the output zero at 2.412MHz.
The output pole is set at:
CCI Loop Definitions
Compensation of the CCI loop depends on the parame-
ters and components shown in Figure 7. C CI is the CCI
loop compensation capacitor. A CSI is the internal gain
where:
f P _ OUT =
1
2 π R L × C OUT
= 1 . 08 kHz
of the current-sense amplifier. RS2 is the charge cur-
rent-sense resistor, RS2 = 15m ? . R OGMI is the equiva-
lent output impedance of the GMI amplifier ≥ 10M ? .
GMI is the charge-current amplifier transconductance
= 1μA/mV. GM OUT is the DC-DC converter transcon-
R L =
? V BATT
? I CHG
= Battery ESR
ductance = 3.3A/V. The CCI loop is a single-pole sys-
tem with a dominant pole compensation set by f P_CI :
Set the compensation zero (f Z_CV ) so it is equivalent to
the output pole (f P_OUT = 1.08kHz), effectively produc-
f P _ CI =
1
2 π R OGMI × C CI
ing a pole-zero cancellation and maintaining a single-
pole system response:
The loop transfer function is given by:
f Z _ CV =
1
2 π R CV × C CV
LTF = GM OUT × A CSI × RS 2 × GMI
R OGMI
1 + sR OGMI × C CI
Since:
C CV =
1
2 π R CV × 1 . 08 kHz
= 147 nF
GM OUT =
1
A CSI × RS 2
Choose C CV = 100nF, which sets the compensation
zero (f Z_CV ) at 1.6kHz. This sets the compensation pole:
The loop transfer function simplifies to:
f P _ CV =
1
2 π R OGMV × C CV
= 0 . 16 Hz
LTF = GMI ×
R OGMI
1 + sR OGMI × C CI
80
60
40
CCV LOOP GAIN
vs. FREQUENCY
-45
-60
-75
CCV LOOP PHASE
vs. FREQUENCY
20
-90
0
-20
-40
-60
-105
-120
-135
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 6. CCV Loop Gain/Phase vs. Frequency
Maxim Integrated
FREQUENCY (Hz)
23
相关PDF资料
PDF描述
MAX876BCPA IC VREF SERIES PREC 10V 8-PDIP
MAX8784ETL+T IC REG STP UP W/AMP 40-TQFN
MAX8785AETI+T IC CCFL CTRL 28-TQFN
MAX8792ETD+T IC PWM CTRLR STEP-DWN 14TDFN
MAX8794ETB+T IC DDR LINEAR REG 10-TDFN
相关代理商/技术参数
参数描述
MAX8767AGTL+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX8767ETL 制造商:Maxim Integrated Products 功能描述:
MAX8767ETL+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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