参数资料
| 型号： | MAX6496ATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PROT SW 8-TDFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电压 - 工作： | 72V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 1.45W |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX6496ATA+TDKR |
MAX6495–MAX6499
72V, Overvoltage-Protection Switches/
Limiter Controllers with an External MOSFET
8
Maxim Integrated
The gate cycles during overvoltage-limit and overvolt-
age-switch modes are quite similar but have distinct
characteristics. In overvoltage-switch mode, GATE is
enhanced to (VIN + 10V) while the monitored VIN volt-
age remains below the overvoltage fault threshold
(OVSET < VTH+). When an overvoltage fault occurs
(OVSET ≥ VTH+), GATE is pulled one diode drop below
OUTFB, turning off the external MOSFET and discon-
necting the load from the input. GATE remains low
(MOSFET off) as long as the VIN voltage is above the
overvoltage fault threshold. As VIN falls back below the
overvoltage fault threshold, GATE is again enhanced to
(VIN + 10V).
In overvoltage-limit mode, GATE is enhanced to (VIN
+10V) while the monitored OUTFB voltage remains
below the overvoltage fault threshold (OVSET < VTH+).
When an overvoltage fault occurs (OVSET ≥ VTH+),
GATE is pulled one diode drop below OUTFB until
OUTFB drops 5% below the overvoltage fault threshold
(MAX6495/MAX6496/MAX6499). GATE is then turned
back on until OUTFB reaches the overvoltage fault
threshold and GATE is again turned off. GATE cycles in
a sawtooth waveform until OUTFB remains below the
overvoltage fault threshold and GATE remains con-
stantly on (VIN +10V). The overvoltage limiter’s saw-
tooth GATE output operates the MOSFET in a
switched-linear mode while the input voltage remains
above the overvoltage fault threshold. The sawtooth fre-
quency depends on the load capacitance, load current,
and MOSFET turn-on time (GATE charge current and
GATE capacitance).
GATE goes high when the following startup conditions
are met: VIN is above the UVLO threshold, SHDN is
high, an overvoltage fault is not present, and the device
is not in thermal shutdown.
Undervoltage Monitoring (MAX6499)
The MAX6499 includes undervoltage and overvoltage
comparators for window detection (see Figures 3 and
12). GATE is enhanced and the n-channel MOSFET is
on when the monitored voltage is within the selected
“window.” When the monitored voltage falls below the
lower limit (VTRIPLOW) or exceeds the upper limit
(VTRIPHIGH) of the window, GATE falls to OUTFB turn-
ing off the MOSFET. The application in Figure 3 shows
the MAX6499 enabling the DC-DC converter when the
monitored voltage is in the selected window.
The resistor values R1, R2, and R3 can be calculated
as follows:
where RTOTAL = R1 + R2 + R3.
Use the following steps to determine the values for R1,
R2, and R3:
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX6499 has very high input
impedance, RTOTAL can be up to 5MΩ.
2) Calculate R3 based on RTOTAL and the desired
upper trip point:
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
4) Calculate R1 based on RTOTAL, R2, and R3:
R1 = RTOTAL – R2 – R3
To improve ESD protection, keep R3 ≥ 1kΩ.
R
VR
V
R
TH
TOTAL
TRIPLOW
23
= ()
×
R
VR
V
TH
TOTAL
TRIPHIGH
3
=
×
+
VV
R
RR
VV
R
TRIPLOW
TH
TOTAL
TRIPHIGH
TH
TOTAL
=
()
+
=
()
+
23
3
OVSET
GND
CLEAR
GATE
OUTFB
IN
SHDN
UVSET
R2
VIN
R3
R1
MAX6499
DC-DC
CONVERTER
GND
IN
OUT
Figure 3. MAX6499 Window-Detector Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6496EVKIT+ | 功能描述:电源管理IC开发工具 MAX6496 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX6497ATA+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube |
| MAX6497ATA+T | 功能描述:电流和电力监控器、调节器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX6498ATA+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube |
| MAX6498ATA+T | 功能描述:电流和电力监控器、调节器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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