参数资料
型号: MAX1909ETI+T
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: 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)
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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