- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄5315 > MAX6498ATA+T (Maxim Integrated Products)IC CNTRLR PROT SW 8-TDFN PDF資料下載
參數(shù)資料
| 型號： | MAX6498ATA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CNTRLR PROT SW 8-TDFN |
| 其它有關(guān)文件： | Automotive Product Guide |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 電壓 - 工作： | 72V |
| 技術(shù)： | 混合技術(shù) |
| 功率（瓦特）： | 1.45W |
| 電路數(shù)： | 1 |
| 應(yīng)用： | 通用 |
| 封裝/外殼： | 8-WDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6397MATA+T | IC SW OVERVOLT PROT 8-TDFN |
| MAX6397VATA+T | IC SW OVERVOLT PROT 8-TDFN |
| MAX6397WATA+T | IC SW OVERVOLT PROT 8-TDFN |
| 950430-5002-AR | CONN SOCKET 30POS RT/A 2MM T/H |
| MAX6397LATA+T | IC SW OVERVOLT PROT 8-TDFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6499ATA/V+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE-PROTECTION SWITCHES/LIMITER CONTROLLERS - Rail/Tube |
| MAX6499ATA/V+T | 制造商:Maxim Integrated Products 功能描述:72V, OVERVOLTAGE-PROTECTION SWITCHES/LIMITER CONTROLLERS WIT - Tape and Reel |
| MAX6499ATA+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube |
| MAX6499ATA+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX649C/D | 功能描述:DC/DC 開關(guān)控制器 5V/3.3V/3V or Adjustable High-Efficiency Low-IQ Step-Down DC-DC Controllers RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。