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参数资料
| 型号： | MAX1956ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 660kHz |
| 占空比： | 97% |
| 电源电压： | 1.6 V ~ 5.5 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
1.6V to 5.5V Input, 0.5% Accurate, Dual
180° Out-of-Phase Step-Down Controllers
must compensate for this gain drop and phase shift in
order to achieve a stable high-bandwidth closed-loop
system.
pensation capacitor (C C ), the amplifier-output resis-
tance (R O ? 5M ? ), and the compensation resistor (R C ):
The basic regulator loop consists of a power modulator,
an output feedback divider, and an error amplifier. The
power modulator has DC gain set by V IN /V RAMP , with a
f PEA =
1
2 π × C C × ( R O + R C )
double pole set by the inductor and output capacitor
and a single zero set by the output capacitor (C OUT )
and its ESR. Equations that define the power modulator
A zero is set by the compensation resistor and the
compensation capacitor:
follow:
The DC gain of the power modulator:
f ZEA =
1
2 π × C C × R C
G MOD ( DC ) =
V IN
V RAMP
The total closed-loop gain must equal unity at the
crossover frequency, where the crossover frequency
should be higher than f ZESR , so that the -1 slope is used
where V RAMP = 1V. The double-pole frequency
because of the inductor and output capacitor is:
to cross over at unity gain. Also, the crossover frequency
should be less than or equal to 1/5 the switching
frequency:
f ZESR C < SW
< f
f PMOD =
1
2 π LC OUT
f
5
The zero frequency because of the output capacitor ’ s
The loop-gain equation at the crossover frequency is:
ESR is:
f ZESR =
1
2 π × ESR × C OUT
where:
V FB
V OUT
× G EA ( fc ) × G MOD ( fc ) = 1
The output capacitor is usually composed of several
same-value capacitors connected in parallel. With n
capacitors in parallel, the output capacitance is:
G EA(fc) = g mEA ? R C , and
G MOD(fc) = G MOD(DC) ? (f PMOD ) 2 / (f ESR ? f C )
The compensation resistor (R C ) is calculated from:
The total ESR is:
C OUT = n × C EACH
R C =
V OUT
g mEA × V FB × G MOD ( fc )
ESR =
ESR EACH
n
where g mEA = 2mS.
Because of the underdamped (Q > 1) nature of the out-
put LC double pole, the error amplifier compensation
The ESR zero (f ZESR ) for a parallel combination of
capacitors is the same as that of an individual capacitor.
The feedback divider has a gain of G FB = V FB /V OUT ,
zero should be approximately 0.2 f PMOD to provide
good phase boost. C C is calculated from:
where V FB is 0.8V.
The transconductance error amplifier has DC gain
G EA(dc) of 80dB. A dominant pole is set by the com-
C C =
5
2 π × R C × f PMOD
A small capacitor (C F ) also can be added from COMP
to GND to provide high-frequency decoupling. C F adds
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1957EUB | 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 |
| MAX1957EUB+ | 功能描述:电流型 PWM 控制器 High-f 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 |
| MAX1957EUB+T | 功能描述:电流型 PWM 控制器 High-f 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 |
| MAX1957EUB-T | 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 |
| MAX19586ETN | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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