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| 型号： | MAX17007AGTI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR QPWM GRAPHICS 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 电源 |
| 电流 - 电源： | 1.7mA |
| 电源电压： | 4.5 V ~ 26 V |
| 工作温度： | -40°C ~ 105°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（4x4） |
| 包装： | 带卷 (TR) |
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Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
I LIMIT ( LOW ) >
? 1 ?
?
Setting the Valley Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The val-
ley of the inductor current occurs at I LOAD(MAX) minus
half the ripple current; therefore:
I LOAD ( MAX ) ? LIR ?
N PH ? 2 ?
where I LIMIT(LOW) equals the minimum current-limit
threshold voltage divided by the output sense element
For the best current-sense accuracy and overcurrent
protection, use a 1% tolerance current-sense resistor
between the inductor and output as shown in Figure
14a. This configuration constantly monitors the inductor
current, allowing accurate current-limit protection.
However, the parasitic inductance of the current-sense
resistor can cause current-limit inaccuracies, especially
when using low-value inductors and current-sense
resistors. This parasitic inductance (L ESL ) can be can-
celled by adding an RC circuit across the sense resis-
tor with an equivalent time constant:
(inductor DCR or sense resistor).
The four-level ILIM setting sets a valley current limit of
C EQ R EQ =
L ESL
R SENSE
15mV, 30mV, 45mV, or 60mV across the CSH_ to CSL_
differential input.
Special attention must be made to the tolerance and
thermal variation of the on-resistance in the case of
DCR sensing. Use the worst-case maximum value for
R DCR from the inductor data sheet, and add some mar-
Alternatively, low-cost applications that do not require
highly accurate current-limit protection can reduce the
overall power dissipation by connecting a series RC
circuit across the inductor (Figure 14b) with an equiva-
lent time constant:
gin for the rise in R DCR with temperature. A good gen-
eral rule is to allow 0.5% additional resistance for each
°C of temperature rise, which must be included in the
design margin unless the design includes an NTC ther-
and:
R CS =
R 2
R 1 + R 2
R DCR
× ?
+
mistor in the DCR network to thermally compensate the
current-limit threshold.
The current-sense method (Figure 14) and magnitude
R DCR =
L
C EQ
? 1 1 ?
?
? R 1 R 2 ?
determine the achievable current-limit accuracy and
power loss. The sense resistor can be determined by:
R SENSE_ = V LIM_ /I LIMIT_
where R CS is the required current-sense resistance and
R DCR is the inductor’s series DC resistance. Use the
worst-case inductance and R DCR values provided by
the inductor manufacturer, adding some margin for the
inductance drop over temperature and load.
INPUT (V IN )
DH_
N H
C IN
SENSE RESISTOR
LX_
L
L ESL
R SENSE
C EQ R EQ =
L ESL
R SENSE
MAX17007 DL_
MAX17008
N L
D L
R EQ
C EQ
C OUT
PGND
CSH_
CSL_
a) OUTPUT SERIES RESISTOR SENSING
Figure 14. Current-Sense Configurations (Sheet 1 of 2)
______________________________________________________________________________________
29
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17007BGTI+ | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17007BGTI+T | 制造商:Maxim Integrated Products 功能描述:DUAL AND COMBINABLE QPWM GRAPHICS CORE CONTROLLERS FOR NOTEB - Tape and Reel |
| MAX17007EVKIT+ | 功能描述:电源管理IC开发工具 QPWM Graphics Core Controller 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 |
| MAX17007GTI+ | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17007GTI+T | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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