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| 型号： | MAX5058AUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/25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
20
POWER-STAGE GAIN/PHASE
90
G T ( s ) = 20 ×
( 500 μ S )
s × C COMPS
× ( 1 . 15 μ A / V ) × R IREF
× ×
15
10
GAIN
PHASE
45
V OUT
V IREF
R S
R S + R LOAD
5
Equating |G T | = 1 and solving for C COMPS yields:
0
-5
-10
0
-45
C COMPS =
( 36.61 μ F × Hz / V ) × R S × V OUT
f CS × ( R S + R LOAD )
-15
The current-sharing loop is compensated with a capac-
-20
-90
itor from COMPS to GND. This results in a dominant
1
10
100
1k
10k
pole that forces the loop gain of the current-share loop
FREQUENCY (Hz)
Figure 16. Idealized (with Ideal Power Stage and Optocoupler)
to cross 0dB with a single pole (20dB/decade) rolloff.
When R LOAD >> R S , the above can be simplified further.
Frequency Response (GPS(s)) from Noninverting Input of the
Error Amplifier to the Output of the Power Supply for the
Typical Application Circuit of Figure 18
C COMPS =
( 36.61 μ F × Hz / V ) × R S × V OUT
f CS × R LOAD
80
60
40
20
0
PHASE
180
135
90
45
0
Example:
R S = 2m Ω
V OUT = 3.3V
f CS = 10Hz
R LOAD = 0.22 Ω
-20
-40
GAIN
-45
-90
C COMPS =
( 36.61 μ F × Hz / V ) × ( 0.002 Ω ) × ( 3.3V )
( 10 Hz ) × ( 0 . 22 Ω )
-60
-80
-135
-180
? 0 . 11 μ F
1
10
100
1k
10k
The resulting overall open-loop response of the current-
FREQUENCY (Hz)
Figure 17. Overall Open-Loop Response of the Current-Share
Loop
Figure 16 shows the idealized small-signal response of
the Typical Application Circuit from the noninverting
input of the error amplifier to the output. This response
shows that the unity-gain crossover frequency of the
current-share loop can easily be placed between 10Hz
and 100Hz, while at the same time avoiding interaction
with the main voltage-control loop.
For frequencies below 100Hz, G T (s) can be written as
(using the DC gain value for G PS (s)):
share control loop is shown in Figure 17.
Applications Information
Isolated 48V Input Power Supply
Figure 18 shows a complete design of an isolated syn-
chronously rectified power supply with a +36V to +75V
telecom input voltage range. This design uses the
MAX5051 as the primary-side controller and the
MAX5058 as the secondary-side synchronous rectifier
driver. Figures 19 though 24 show some of the perfor-
mance aspects of this power-supply design. This
power supply can sustain a continuous short circuit at
its output terminals. This circuit is available as a com-
pletely built and tested evaluation kit (MAX5058EVKIT).
______________________________________________________________________________________
21
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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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