- 您现在的位置：买卖IC网 > PDF目录1228 > MAX34561EVKIT# (Maxim Integrated Products)EVAL KIT DUAL E-FUSE 24-TQFN PDF资料下载
参数资料
| 型号： | MAX34561EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT DUAL E-FUSE 24-TQFN |
| 标准包装： | 1 |
| 系列： | * |
12V/5V Hot-Plug Switch
Once the device has been enabled, there is a delay
(t POND ) until conduction begins from V CC12 (V CC5 ) to
LOAD12 (LOAD5). This delay is the time required for
the charge pump to bring the gate voltage of the cor-
responding power MOSFET above its threshold level.
Once the gate is above the threshold level, conduction
begins and the output voltage begins ramping.
Automatic-Enable Mode
When V CC12 (V CC5 ) exceeds V UR12 (V UR5 ), the gate
holding the TIMER12 (TIMER5) node low is released. The
internal current source brings the node to a level greater
than V ON , enabling the device.
Delayed Automatic-Enable Mode
When V CC12 (V CC5 ) exceeds V UR12 (V UR5 ), the gate
holding the TIMER12 (TIMER5) node low is released. The
internal current source (I TIMER ) then begins charging
C TIMER_ . When C TIMER_ is charged to a level greater
than V REF12 (V REF5 ), the device turns on. The equation
for the delay time is:
t DELAY = (C TIMER12 x V REF12 )/I TIMER
t DELAY = (C TIMER5 x V REF5 )/I TIMER
Enable/Disable Mode
A logic gate or open-collector device can be connected
to TIMER12 (TIMER5) to enable or disable the device.
When TIMER12 (TIMER5) is held low, the device is dis-
abled. When an open-collector device is used to drive
TIMER12 (TIMER5), the device is enabled when the open
collector is in its high-impedance state by the internal
current source bringing the TIMER12 (TIMER5) node
high. TIMER12 (TIMER5) is also compatible with most
logic families if the output high voltage level of the gate
exceeds the V ON level, and the gate can sink the I TIMER
current.
Enable with Delay/Disable Mode
An open-collector device is connected in parallel with
C TIMER_ . When the pin is held low, the device is dis-
abled. When the open-collector driver is high imped-
ance, the internal current source begins to charge
C TIMER_ as in the delayed mode.
Output-Voltage Ramp
The voltage ramp circuit uses an operational ampli-
fier to control the gate bias of the corresponding
n-channel power MOSFET. When the timer/enable
circuit is disabled, a FET is used to keep C VRAMP_
discharged, which forces the output voltage to GND.
Once the enable/timer circuit has been enabled, an
internal current source, I VRAMP , begins to charge the
external capacitor, C VRAMP_ , connected to VRAMP12
(VRAMP5). The amplifier controls the gate of the corre-
sponding power MOSFET so that the LOAD12 (LOAD5)
output voltage divided by two tracks the rising voltage
level of C VRAMP_ . The output voltage continues to ramp
until it reaches either the input V CC12 (V CC5 ) level
or the overvoltage clamp limits. The equation for the
output-voltage ramp function is:
dV LOAD /dt = 2 x (I VRAMP /C VRAMP12 ) for +12V circuit
dV LOAD /dt = 2.3332 x (I VRAMP /C VRAMP5 ) for +5V circuit
Thermal Shutdown
The device enters a thermal shutdown state when
the temperature of the corresponding power MOSFET
reaches or exceeds T SHDN , approximately +135 N C.
When T SHDN is exceeded, the thermal-limiting cir-
cuitry disables the device using the enable circuitry.
Depending on the state of ARD12 (ARD5), the device
attempts to autoretry once the device has cooled, or it
latches off.
Autoretry
If ARD12 (ARD5) is unconnected or connected high, the
device continually monitors the temperature once it has
entered thermal shutdown. If the junction temperature
falls below approximately +95 N C (T SHDN - T HYS ), the
corresponding power MOSFET is re-enabled. See the
Thermal Shutdown with Autoretry Enabled typical operat-
ing curves for details.
Latchoff
If ARD12 (ARD5) is pulled low and the device has
entered thermal shutdown, it does not attempt to turn
back on. The only way to turn the device back on is to
cycle the power to the device. When power is reapplied
to V CC12 (V CC5 ), the junction temperature needs to be
less than T SHDN for the device to be enabled.
Overvoltage Limit
The overvoltage-limiting clamp monitors the VRAMP12
(VRAMP5) level compared to an internal voltage ref-
erence. When the voltage on VRAMP12 (VRAMP5)
exceeds V OVC12 /2 (or V OVC5 /2.3332), the gate volt-
age of the corresponding n-channel power MOSFET is
reduced, limiting the voltage on LOAD12 (LOAD5) to
V OVC12 (V OVC5 ) even as V CC12 (V CC5 ) increases. If the
device is in overvoltage for an extended period of time,
the device could overheat and enter thermal shutdown.
This is caused by the power created by the voltage
9
相关PDF资料 |
PDF描述 |
|---|---|
| MAX34565EVKIT# | KIT EVAL FOR MAX34565 |
| MAX367CWN | IC SIGNAL-LINE CIRC PROT 18-SOIC |
| MAX4080EVKIT+ | KIT EVAL FOR MAX4080 |
| MAX4208EVKIT+ | KIT EVAL FOR MAX4208 |
| MAX4209EVKIT+ | KIT EVAL FOR MAX4209 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX34561EVKIT# | 功能描述:电源管理IC开发工具 12V&5V DUAL E-FUSE 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 |
| MAX34561T+ | 功能描述:热插拔功率分布 12V/5V Hot-Plug Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX34561T+T | 功能描述:热插拔功率分布 12V/5V Hot-Plug Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX34564AETB+ | 功能描述:热插拔功率分布 12V Hot Plug Switch Auto-Retry RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX34564AETB+T | 功能描述:热插拔功率分布 12V Hot Plug Switch Auto-Retry RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。