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参数资料
| 型号： | MAX5041EAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/26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
Phase-Locked Loop: Operation and
Compensation
The PLL synchronizes the internal oscillator to the
V CNTR + ? V OUT /2
V CNTR
V CNTR - ? V OUT /2
external frequency source when driving CLKIN.
Connecting CLKIN to V CC or SGND forces the PWM
frequency to default to the internal oscillator frequency
of 500kHz or 250kHz, respectively. The PLL uses a
conventional architecture consisting of a phase detec-
tor and a charge pump capable of providing 20μA of
output current. Connect an external series combination
capacitor (C25) and resistor (R4) and a parallel capaci-
tor (C26) from PLLCMP to SGND to provide frequency
NO LOAD
1/2 LOAD
LOAD (A)
FULL LOAD
compensation for the PLL (Figure 1). The pole-zero pair
compensation provides a zero at f Z = 1 / [R4 x (C25 +
C26)] and a pole at f P = 1 / (R4 x C26). Use the follow-
Figure 5. Defining the Voltage-Positioning Window
Set the voltage-positioning window ( ? V OUT ) using the
resistive feedback of the VEA. Use the following equa-
tions to calculate the voltage-positioning window for the
MAX5038:
ing typical values for compensating the PLL:
R4 = 7.5k ? , C25 = 4.7nF, C26 = 470pF. If changing the
PLL frequency, expect a finite locking time of approxi-
mately 200μs.
The MAX5038/MAX5041 require compensation on
PLLCMP even when operating from the internal oscilla-
tor. The device requires an active PLL in order to gen-
? V OUT = OUT IN
I × R
2 × G C × R F
(8)
erate the proper internal PWM clocks.
MOSFET Gate Drivers (DH_, DL_)
The high-side (DH_) and low-side (DL_) drivers drive
the gates of external N-channel MOSFETs (Figures 1
and 2). The drivers’ high-peak sink and source current
G C =
0.05
R S
(9)
capability provides ample drive for the fast rise and fall
times of the switching MOSFETs. Faster rise and fall
times result in reduced cross-conduction losses. For
Use the following equation to calculate the voltage-posi-
tioning window for the MAX5041:
modern CPU voltage-regulating module applications
where the duty cycle is less than 50%, choose high-
side MOSFETs (Q1 and Q3) with a moderate R DS(ON)
× H L
? V OUT =
I OUT × R IN
( 2 × G C × R F )
R + R
R L
(10)
and a very low gate charge. Choose low-side
MOSFETs (Q2 and Q4) with very low R DS(ON) and
moderate gate charge.
The driver block also includes a logic circuit that pro-
vides an adaptive non-overlap time to prevent shoot-
through currents during transition. The typical
G C =
0.05
R S
(11)
non-overlap time is 60ns between the high-side and
low-side MOSFETs.
BST_
where R IN and R F are the input and feedback resistors of
the VEA, G C is the current-loop gain and R S is the cur-
rent-sense resistor or, if using lossless inductor current
sensing, the DC resistance of the inductor.
V DD powers the low- and high-side MOSFET drivers.
Connect a 0.47μF low-ESR ceramic capacitor between
BST_ and LX_. Bypass V CC to PGND with 4.7μF and
0.1μF low-ESR ceramic capacitors. Reduce the PC
board area formed by these capacitors, the rectifier
diodes between V CC and the boost capacitor, the
MAX5038/MAX5041, and the switching MOSFETs.
______________________________________________________________________________________
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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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