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參數(shù)資料
| 型號(hào)： | MAX5075CAUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 功率晶體管 |
| 英文描述： | Push-Pull FET Driver with Integrated Oscillator and Clock Output |
| 中文描述： | 3 A HALF BRDG BASED MOSFET DRIVER, PDSO8 |
| 封裝： | MO-187, MSOP-8 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 234K |
| 代理商： | MAX5075CAUA |
M
Detailed Description
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
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
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:
where f
OSC
is the oscillator frequency and R
RT
is a
resistor connected from RT to DGND in ohms.
Place 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.
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.
f
xR
OSC
RT
=
10
32
12
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
6
_______________________________________________________________________________________
PART
f
CLK
f
NDRV1
f
CLK
to f
SW
RATIO
MAX5075A
MAX5075B
MAX5075C
f
OSC
/ 2
f
OSC
f
OSC
f
OSC
/ 2
f
OSC
/ 2
f
OSC
/ 4
1
2
4
Table 1. MAX5075 CLK Output Frequency
CLK
OSC
NDRV1
NDRV2
CLK
OSC
NDRV1
NDRV2
CLK
OSC
NDRV1
NDRV2
MAX5075A
MAX5075B
MAX5075C
Figure 2. MAX5075 CLK Timing Diagrams
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5075CAUA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5075CAUA-T | 功能描述:功率驅(qū)動(dòng)器IC Push-Pull FET Driver w/Osc & Clock RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX5077 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output |
| MAX5077AUD | 功能描述:功率驅(qū)動(dòng)器IC Push-Pull FET Driver w/Osc & Clock RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX5077AUD+ | 功能描述:功率驅(qū)動(dòng)器IC Push-Pull FET Driver w/Osc & Clock RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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