- 您现在的位置：买卖IC网 > PDF目录15514 > MAX1876EEG+ (Maxim Integrated Products)IC REG CTRLR BUCK PWM VM 24-QSOP PDF资料下载
参数资料
| 型号： | MAX1876EEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 660kHz |
| 占空比： | 90% |
| 电源电压： | 4.75 V ~ 23 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
An R ILIM resistance range of 100k ? to 600k ? corre-
sponds to a current-limit threshold of 50mV to 300mV.
When adjusting the current limit, 1% tolerance resistors
minimize error in the current-limit threshold.
For foldback current limit, a resistor (R FBI ) is added
from ILIM pin to output. The value of R ILIM and R FBI
can then be calculated as follows:
First select the percentage of foldback, P FB , from 15%
to 30%, then:
MAX1875
FB_
OUT_
R_A
R_B
MAX1875
REF
FB_
R_C
R_A
OUT_
R FBI =
and
P FB × V OUT
5 × 10 - 6 ( 1 - P FB )
V OUT_ > 1V
Figure 6. Adjustable Output Voltage
V OUT_ < 1V
R ILIM =
10 × V ITH ( 1 - P FB ) × R FBI
[ V OUT - 10 × V ITH ( 1 - P FB ) ]
Output Capacitor
The key selection parameters for the output capacitor
are capacitance value, ESR, and voltage rating. These
Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit ’ s switching.
The input capacitor must meet the ripple current
requirement (I RMS ) imposed by the switching currents
as defined by the following equation:
parameters affect the overall stability, output ripple volt-
age, and transient response. The output ripple has two
components: variations in the charge stored in the out-
put capacitor, and the voltage drop across the capaci-
tor ’ s ESR caused by the current flowing into and out of
the capacitor:
V RIPPLE ? V RIPPLE ( ESR ) + V RIPPLE ( C )
I RMS = I LOAD
V OUT ( V IN - V OUT )
V IN
The output voltage ripple as a consequence of the ESR
and output capacitance is:
V RIPPLE ( C ) =
I P - P = ? IN OUT ? ? OUT ?
I RMS has a maximum value when the input voltage
equals twice the output voltage (V IN = 2V OUT ), so
I RMS(MAX) = I LOAD / 2. For most applications, non-
tantalum capacitors (ceramic, aluminum, polymer, or
OS-CON) are preferred at the input due to their robust-
ness with high inrush currents typical of systems that
can be powered from very low impedance sources.
Additionally, two (or more) smaller-value low-ESR capac-
itors can be connected in parallel for lower cost. Choose
an input capacitor that exhibits less than +10 ° C temper-
ature rise at the RMS input current for optimal long-term
reliability.
V RIPPLE ( ESR ) = I P - P R ESR
I P - P
8 C OUT f SW
? V - V ? ? V ?
? f SW L ? ? V IN ?
where I P-P is the peak-to-peak inductor current (see the
Inductor Selection section). These equations are suit-
able for initial capacitor selection, but final values
should be verified by testing in a prototype or evaluation
circuit.
14
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1651ESA+ | IC REG CTRLR BUCK PWM 8-SOIC |
| MAX1649ESA+ | IC REG CTRLR BUCK PWM 8-SOIC |
| MAX1714BEEE+ | IC REG CTRLR BUCK PWM CM 16-QSOP |
| MAX1762EUB+ | IC REG CTRLR BUCK PWM CM 10-UMAX |
| MAX1791EUB+ | IC REG CTRLR BUCK PWM CM 10-UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1876EEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down 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 |
| MAX1876EEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down 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 |
| MAX1876EEG-G05 | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1876EEG-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1876EEG-TG05 | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。