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参数资料
| 型号： | MAX5041EAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.75 V ~ 28 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-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
Dual-Phase, Parallelable, Average Current-Mode
Controllers
The outer voltage control loop consists of the differen-
tial amplifier (DIFF AMP), reference voltage, and VEA.
The unity-gain differential amplifier provides true differ-
ential remote sensing of the output voltage. The differ-
ential amplifier output connects to the inverting input
(EAN) of the VEA. The noninverting input of the VEA is
internally connected to an internal precision reference
voltage. The MAX5041 reference voltage is set to +1.0V
and the MAX5038 reference is set to the preset output
voltage. The VEA controls the two inner current loops
(Figures 3a and 3b). Use a resistive feedback network
to set the VEA gain as required by the adaptive volt-
age-positioning circuit (see the Adaptive Voltage
Positioning section).
Current-Sense Amplifier
The differential current-sense amplifier (CA_) provides a
DC gain of 18. The maximum input offset voltage of the
current-sense amplifier is 1mV and the common-mode
voltage range is -0.3V to +3.6V. The current-sense ampli-
fier senses the voltage across a current-sense resistor.
Peak-Current Comparator
The peak-current comparator provides a path for fast
cycle-by-cycle current limit during extreme fault condi-
tions such as an output inductor malfunction (Figure 4).
Note that the average current-limit threshold of 48mV
still limits the output current during short-circuit condi-
tions. To prevent inductor saturation, select an output
inductor with a saturation current specification greater
than the average current limit (48mV). Proper inductor
selection ensures that only extreme conditions trip the
peak-current comparator, such as a cracked output
inductor. The 112mV voltage threshold for triggering
the peak-current limit is twice the full-scale average
current-limit voltage threshold. The peak-current com-
parator has a delay of only 260ns.
Current-Error Amplifier
Each phase of the MAX5038/MAX5041 has a dedicated
transconductance current-error amplifier (CEA_) with a
typical g m of 550μS and 320μA output sink and source
current capability. The current-error amplifier outputs,
CLP1 and CLP2, serve as the inverting input to the
PWM comparator. CLP1 and CLP2 are externally
accessible to provide frequency compensation for the
inner current loops (Figures 3a and 3b). Compensate
CEA_ such that the inductor current down slope, which
becomes the up slope to the inverting input of the PWM
comparator, is less than the slope of the internally gen-
erated voltage ramp (see the Compensation section).
PWM Comparator and R-S Flip-Flop
The PWM comparator (CPWM) sets the duty cycle for
each cycle by comparing the output of the current-error
amplifier to a 2V P-P ramp. At the start of each clock
cycle, an R-S flip-flop resets and the high-side driver
(DH_) turns on. The comparator sets the flip-flop as
soon as the ramp voltage exceeds the CLP_ voltage,
thus terminating the ON cycle (Figure 4).
DRV_V CC
PEAK-CURRENT
COMPARATOR
112mV
CLP_
CSP_
A V = 18
CSN_
GM IN
G m =
500 μ S
PWM
COMPARATOR
BST_
RAMP
2 x f s (V/s)
S
Q
DH_
LX_
CLK
SHDN
R
Q
DL_
PGND
Figure 4. Phase Circuit (Phase 1/Phase 2)
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5041EAI+ | 功能描述:电流型 PWM 控制器 Dual-Phase Parallelable Average 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 |
| MAX5041EAI+T | 功能描述:电流型 PWM 控制器 Dual-Phase Parallelable Average 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 |
| MAX5041EAI+TG48 | 制造商:Maxim Integrated Products 功能描述:N/A - Tape and Reel |
| MAX5041EAI-T | 功能描述:电流型 PWM 控制器 Dual-Phase Parallelable Average 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 |
| MAX5041EAI-TG48 | 制造商:Maxim Integrated Products 功能描述:DUAL-PHASE, PARALLELABLE, AVERAGE CURRENT-MODE CONTROLLERS - Tape and Reel |
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