参数资料
型号: MAX1954AEUB+T
厂商: Maxim Integrated Products
文件页数: 8/18页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 10-UMAX
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 360kHz
占空比: 93%
电源电压: 3 V ~ 13.2 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 带卷 (TR)
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
Functional Diagram
IN
THERMAL
LIMIT
UVLO
SHUTDOWN
COMPARATOR
SLOPE
COMPENSATION
MAX1954A
0.5V
HSD
COMP
2.36V
CLAMP
FB
ERROR
AMPLIFIER
PWM
CONTROL
CIRCUITRY
CURRENT-
SENSE
CIRCUITRY
IN
BST
DH
LX
DL
CURRENT-LIMIT
REFERENCE
AND
SOFT-START
DIGITAL-TO-ANALOG
CONVERTER
FOLDBACK CURRENT-
LIMIT CIRCUITRY
CLOCK
GND
SHORT-CIRCUIT
CURRENT-LIMIT
CIRCUITRY
COMPARATOR
PGND
During the second half of the cycle, the high-side
MOSFET turns off and the low-side MOSFET turns on. The
inductor releases the stored energy as the current ramps
down, providing current to the output. The output capaci-
tor stores charge when the inductor current exceeds the
required load current and discharges when the inductor
current is lower, smoothing the voltage across the load.
Under overload conditions, when the inductor current
exceeds the current limit (see the Current-Limit Circuit
section), the high-side MOSFET is not turned on at the ris-
ing clock edge and the low-side MOSFET remains on to
let the inductor current ramp down.
The MAX1954A operates in a forced-PWM mode; there-
fore, the controller maintains a constant switching fre-
quency, regardless of load, to allow for easier post-
filtering of the switching noise.
Current-Sense Amplifier
The current-sense circuit amplifies the current-sense
voltage (the high-side MOSFET ’s on-resistance
(R DS(ON) ) multiplied by the inductor current). This ampli-
fied current-sense signal and the internal slope-compen-
sation signal are summed (V SUM ) together and fed into
the PWM comparator’s inverting input. The PWM com-
parator shuts off the high-side MOSFET when V SUM
exceeds the integrated feedback voltage (V COMP ).
8
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相关代理商/技术参数
参数描述
MAX1954AEUB-TG05 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1954AEUB-TG077 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1954AEVKIT 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX1954A RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1954BEUB 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1954BEUB+ 功能描述:电流型 PWM 控制器 Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14