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| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/29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
amplifier, R OGMV , is greater than 10M ? . The voltage
amplifier transconductance, GMV = 0.125μA/mV for 4
cells and 0.167μA/mV for 3 cells. The DC-DC converter
transconductance is dependent upon the charge cur-
C OUT is typically much lower impedance than R L near
crossover so the parallel impedance is mostly capaci-
tive and:
?
rent-sense resistor RS2:
GM OUT =
1
A CSI × RS 2
R L 1
( 1 + sC OUT × R L ) sC OUT
If R ESR is small enough, its associated output zero has
where A CSI = 15V/V and RS2 = 30m ? in the typical
a negligible effect near crossover and the loop-transfer
function can be simplified as follows:
application circuits, so GM OUT = 2.22A/V.
The loop transfer function is given by:
LTF = GM OUT × R L × GMV × R OGMV ×
LTF = GM OUT ×
R CV
sC OUT
G MV
(1 + sC OUT × R ESR )(1 + sC CV × R CV )
( 1 + sC CV × R OGMV )( 1 + sC OUT × R L )
Setting the LTF = 1 to solve for the unity-gain frequency
yields:
The poles and zeros of the voltage-loop transfer function
are listed from lowest frequency to highest frequency in
f CO _ CV = GM OUT × G MV ×
R CV
2 π x C OUT
Table 2.
Near crossover, C CV is much lower impedance than
R OGMV . Since C CV is in parallel with R OGMV, C CV domi-
nates the parallel impedance near crossover. Additionally
R CV is much higher impedance than C CV and dominates
the series combination of R CV and C CV , so:
For stability, choose a crossover frequency lower than
1/5 the switching frequency. For example, choosing a
crossover frequency of 45kHz and solving for R CV
using the component values listed in Figure 1 yields
R CV = 10k ? :
R OGMV x (1 + sC CV × R CV )
( 1 + sC CV × R OGMV )
? R CV
R CV =
2 π × C OUT × f CO _ CV
GMV × GM OUT
? 10 k ?
Table 2. CCV Loop Poles and Zeros
NAME
EQUATION
DESCRIPTION
CCV pole
f P _ CV =
1
2 π R OGMV × C CV
Lowest frequency pole created by C CV and GMV’s finite output resistance.
Since R OGMV is very large and not well controlled, the exact value for the
pole frequency is also not well controlled (R OGMV > 10M ? ).
Voltage-loop compensation zero. If this zero is at the same frequency or
CCV zero
f Z _ CV =
1
2 π R CV × C CV
lower than the output pole f P_OUT , then the loop-transfer function
approximates a single-pole response near the crossover frequency.
Choose C CV to place this zero at least 1 decade below crossover to ensure
adequate phase margin.
Output
pole
f P _ OUT =
1
2 π R L × C OUT
Output pole formed with the effective load resistance R L and output
capacitance C OUT . R L influences the DC gain but does not affect the
stability of the system or the crossover frequency.
Output
zero
f Z _ OUT =
1
2 π R ESR × C OUT
Output ESR Zero. This zero can keep the loop from crossing unity gain if
f Z_OUT is less than the desired crossover frequency; therefore, choose a
capacitor with an ESR zero greater than the crossover frequency.
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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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