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参数资料
| 型号： | MAX5059AUI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/25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： | 2,500 |
| 应用： | 电源 |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 9.3 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： | 带卷 (TR) |
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
Reverse-Current Prevention
in Synchronous Rectifiers
One benefit of secondary-side synchronous rectifica-
tion is increased efficiency. Another benefit is that it
allows the inductor current to remain continuous
throughout the operating load range. This results in
constant loop dynamics that are easy to compensate.
In some cases, it may be necessary to turn off the free-
wheeling MOSFET when the current through this device
attempts to flow from drain to source. Turning off this
MOSFET can be done to enhance efficiency at low out-
put current. When multiple power supplies are paral-
leled, the power supply with the highest output voltage
has a tendency to source current into the power-supply
outputs with lower output voltage. Turning off the free-
wheeling MOSFET also prevents this current back-flow.
When the inductor current is allowed to become dis-
continuous, the loop dynamics change and the circuit
must be compensated accordingly to accommodate
stable continuous and discontinuous mode operation.
Turning off the freewheeling MOSFET is accomplished
by using the zero-current comparator (pins ZCP and
ZCN). Use this comparator to sense reverse current in
the freewheeling MOSFET and turn off the device by
pulling QSYNC low. An internal latch prevents the free-
wheeling MOSFET from turning on until the off-time of
the next cycle.
Reference Current
The MAX5058/MAX5059 do not have an explicit refer-
ence voltage generator. Instead, they contain a 1%-
accurate trimmed 50μA current source. This allows sig-
nificant flexibility in setting the reference voltage. In
some cases, the output-voltage resistive divider, con-
connected from I REF to GND. INV is the inverting input
and connects to the center of a resistive divider from
OUT to INV to GND. The output of the error amplifier,
COMPV, connects to the cathode of the LED in the
optocoupler to control the diode current that transmits
the error signal back to the primary-side controller. An
open-drain-output error amplifier simplifies interfacing
with the feedback optocoupler. Use this error amplifier
the same way as the industry-standard TL431 shunt ref-
erence. The open-drain output provides flexibility that
may be necessary when additional functionality such
as secondary current-limit regulation is required. Unlike
the TL431, the output of the internal error amplifier of
the MAX5058/MAX5059 is guaranteed to be a maxi-
mum of 200mV with a 5mA drain current, compared to
2.5V for the TL431 and 1.24V for the TLV431.
In some cases, it is possible to avoid the use of the out-
put voltage-divider (R1 and R2) by connecting INV to
the output through just R1. This eliminates the voltage
tolerance errors caused by R1 and R2. Output voltage
in this configuration is set directly by using a suitable
resistor at I REF . Figure 7 shows this configuration.
V OUT
R1
sisting of R1 and R2 in the Typical Application Circuit ,
can be eliminated by selecting a suitable resistor value
at the I REF pin. This reduces the error that the output
voltage-divider may add. Use a low-value bypass
capacitance at this pin to eliminate noise. Typical values
COMPV
13
INV
14
C28
for this capacitance are calculated by considering the
pole that it presents with R12. This pole must be placed
well beyond the frequency range of interest of the cur-
rent-share loop. Use values less than 2.2nF.
Error Amplifier
The MAX5058/MAX5059 incorporate a 1.3MHz unity
gain-bandwidth error amplifier with inputs INV, I REF ,
and output COMPV. I REF is the noninverting input and
also serves as the reference voltage generator with the
I REF
50 μ A
E/A
I REF
12
V OUT = (50 μ A) x R12
FOR: 0.5V ≤ V OUT ≤ 2.5V
R12
internal 50μA current source and the external resistor
Figure 7. Output Voltage Regulation for 0.5V ≤ VOUT ≤ 2.5V
______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX5059EUI | 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 |
| MAX5059EUI+ | 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 |
| MAX5059EUI+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 |
| MAX5059EUI-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 |
| MAX505ACAG | 功能描述:数模转换器- DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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