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参数资料
| 型号： | MAX5058AUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | IC DRVR SYNC RECT 28-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 电源 |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 管件 |
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
Current-sharing functions follow:
V TO I
1.5 μ A
SLOPE = 1.15 μ A/V
V CAA
1.25V
Figure 14. Transfer Function Curve of the V to I Block
FEEDBACK
NETWORK
The voltage across the current-sense resistor for each
module is sensed and compared to the voltage on the
current-share bus. The voltage on the current-share bus
represents the current from the module that has the high-
est output current compared to the other modules. Each
module compares its current to this maximum current. If
its current is less than the maximum, then the module
increases its reference current with the VtoI block. This
raises the reference voltage presented at the noninvert-
ing input of the error amplifier. With a higher reference
voltage, the output voltage of the module rises in an
attempt to increase its output current. This process con-
tinues until the currents balance between the modules.
The current-adjust amplifier (see Figure 1) has an offset
at its inverting input that requires the share-bus voltage
to reach 40mV before the current-share control loop
attempts to regulate the output-load-current balance.
Thus, the current-share regulation does not begin until
the current-sense signals have exceeded 2mV (i.e.,
E/A
G PS (s)
PWM STAGE
AND FILTERS
V OUT
R S
+ V SENSE -
42mV/20).
Figure 15 shows the simplified equivalent small-signal
circuit of the current-share control loop. The current-
R LOAD
adjust amplifier represents the error amplifier in this
G CSA (s)
CSA
loop. The command signal, which is the voltage across
the SFP and SFN pins, is applied to the noninverting
input of this amplifier. For small-signal analysis, the
noninverting pin is shown grounded in Figure 15. This is
R IREF
G V TO I (s)
V TO I
G CAA (s)
C COMPS
CAA
a low-bandwidth loop.
Assuming a much smaller unity-gain crossover bandwidth
(f CS ) for the current-share loop compared to the main out-
put-voltage-regulation loop (i.e., f CS << f C ), the open-loop
gain of the current-share loop can be written as:
? × ( G VtoI IREF )
? G CAA ( s ) ?
? s × C COMPS ?
Figure 15. Small-Signal Equivalent Current-Share Control Loop
G T ( s ) = G SFA ( s ) × ? ( s ) × R
The adjustment range and thus the sharing capability of
the modules is limited by the amount of additional out-
put voltage boost possible through the VtoI block. The
× G PS ( s ) ×
R S
R S + R LOAD
typical voltage boost is +3% (i.e., 1.5μA/50μA). Figure
14 shows the transfer function of the VtoI block. This
adjustment range also sets a limit on the amount of volt-
age drop allowed for current sharing. For effective cur-
rent sharing, the sum of all voltage drops must be kept
below 3% and the output-to-load connection drop of
each power module must be kept equal.
where f CS is the unity-gain crossover frequency of the
current-share loop (typically 10Hz to 100Hz), f C is the
unity-gain crossover frequency of the main output loop,
G PS (s) is the gain of the power stage from the refer-
ence voltage input of the error amplifier to the output
(G PS = V OUT /V IREF ), R S is the current-sense resistor,
and R LOAD is the load resistance. Note that the current-
share loop bandwidth is highest for the lowest value of
R LOAD (maximum load).
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5058AUI+ | 功能描述:功率驱动器IC Secondary Side Synch Rectifier Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5058AUI+T | 功能描述:功率驱动器IC Secondary Side Synch Rectifier Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5058AUI-T | 功能描述:功率驱动器IC Secondary Side Synch Rectifier Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5058EUI | 功能描述:功率驱动器IC Secondary Side Synch Rectifier Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5058EUI+ | 功能描述:功率驱动器IC Secondary Side Synch Rectifier Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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