收藏本站
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
Detailed Description
Table 1. MAX5075 CLK Output Frequency
The MAX5075 is a +4.5V to +15V push-pull, current-fed
topology driver subsystem with an integrated oscillator
for use in 48V module power supplies.
The MAX5075 features a programmable, accurate inte-
grated oscillator with a synchronizing clock output that
can be used to synchronize an external PWM stage. A
PART
MAX5075A
MAX5075B
MAX5075C
f CLK
f OSC / 2
f OSC
f OSC
f NDRV1
f OSC / 2
f OSC / 2
f OSC / 4
f CLK to f SW
RATIO
1
2
4
single external resistor programs the internal oscillator
frequency from 50kHz to 1.5MHz.
The MAX5075 incorporates a dual MOSFET driver with
±3A peak drive currents and a 50% duty cycle. The
MOSFET driver generates complementary signals to
drive external ground-referenced n-channel MOSFETs.
The MAX5075 is available with a clock output frequency
to MOSFET driver frequency ratios of 1x , 2x, and 4x.
Internal Oscillator
An external resistor at RT programs the MAX5075
internal oscillator frequency from 50kHz to 1.5MHz. The
MAX5075A/B NDRV1 and NDRV2 switching frequen-
cies are one-half the programmed oscillator frequency
NDRV2
NDRV1
CLK
OSC
NDRV2
NDRV1
CLK
MAX5075A
with a nominal 50% duty cycle. The MAX5075C NDRV1
and NDRV2 switching frequencies are one-fourth the
oscillator frequency.
Use the following formula to calculate the internal oscil-
lator frequency:
OSC
NDRV2
NDRV1
CLK
MAX5075B
10
f OSC =
12
32 xR RT
OSC
MAX5075C
where f OSC is the oscillator frequency and R RT is a
resistor connected from RT to DGND in ohms.
Place a series combination of a 4.7k ? resistor and a
1nF capacitor from RT to DGND for stability and to filter
out noise.
Synchronizing Clock Output
The MAX5075 provides a buffered clock output that can
be used to synchronize the oscillator input of a PWM con-
troller. CLK is powered from an internal 5V regulator and
sources/sinks up to 10mA. The MAX5075 has internal
CLK output frequency to NDRV1 and NDRV2 switching
frequency ratios set to 1x, 2x, or 4x (Table 1).
The MAX5075A has a CLK frequency to NDRV_ frequen-
cy ratio set to 1x. The MAX5075B has a CLK frequency to
NDRV_ frequency ratio set to 2x and the MAX5075C has
a CLK frequency to NDRV_ frequency ratio set to 4x.
There is a typical 30ns delay from CLK to NDRV_ output.
Figure 2. MAX5075 CLK Timing Diagrams
Applications Information
Supply Bypassing
Pay careful attention to bypassing and grounding the
MAX5075. Peak supply and output currents may exceed
3A when driving large MOSFETs. Ground shifts due to
insufficient device grounding may also disturb other cir-
cuits sharing the same ground-return path. Any series
inductance in the V CC , NDRV1, NDRV2, and/or GND
paths can cause noise due to the very high di/dt when
switching the MAX5075 with any capacitive load. Place
one or more 0.1μF ceramic capacitors in parallel as close
to the device as possible to bypass V CC to PGND. Use a
ground plane to minimize ground-return resistance and
inductance. Place the external MOSFETs as close as
possible to the MAX5075 to further minimize board induc-
tance and AC path impedance.
6
_______________________________________________________________________________________
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MAX5077AUD+ IC DRVR FET P-P 14-TSSOP
MAX5078BATT+T IC MOSFET DRIVER 6-TDFN
MAX5092EVKIT+ KIT EVALUATION FOR MAX5092
MAX620EWN IC DVR QUAD HISIDE MOSFET 18SOIC
MAX626CPA+ IC DRIVER MOSFET DUAL 8-DIP
MAX662EVKIT-SO EVAL KIT FOR MAX662
MAX6947ATE+T IC LED DRIVER LINEAR 16-TQFN
MAX6948BGWA+T IC LED DVR PWM GPIO 25WLP
相关代理商/技术参数
MAX5075AAUA+ 功能描述:功率驱动器IC Push-Pull FET Driver w/Osc & Clock 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
MAX5075AAUA+T 功能描述:功率驱动器IC Push-Pull FET Driver w/Osc & Clock 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
MAX5075AAUA-T 功能描述:功率驱动器IC Push-Pull FET Driver w/Osc & Clock 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
MAX5075B 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Push-Pull FET Driver with Integrated Oscillator and Clock Output
MAX5075BAUA 功能描述:功率驱动器IC Push-Pull FET Driver w/Osc & Clock 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
MAX5075BAUA+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX5075BAUA-T 功能描述:功率驱动器IC Push-Pull FET Driver w/Osc & Clock 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
MAX5075C 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Push-Pull FET Driver with Integrated Oscillator and Clock Output