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参数资料
| 型号： | DS2154L |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PQFP100 |
| 封装： | 14 X 14 MM, 1.40 MM HEIGHT, LQFP-100 |
| 文件页数： | 10/11页 |
| 文件大小： | 1257K |
| 代理商： | DS2154L |
8
Maxim Integrated
250mA to 2.5A Adjustable Current-Limit Switches
MAX14575A/MAX14575AL/
MAX14575B/MAX14575C
Detailed Description
The MAX14575A/MAX14575AL/MAX14575B/MAX14575C
programmable current-limit switches operate from +2.3V
to +5.5V and provide internal current limiting adjust-
able from 250mA to 2.5A. These devices feature a fixed
blanking time and a FLAG output that notifies the proces-
sor when a fault condition is present.
Programmable Current-Limit Threshold
A resistor from SETI to GND sets the current-limit thresh-
old for the switch (see the Setting the Current-Limit
Threshold section). If the output current is limited at the
current threshold value for a time equal to or longer than
tBLANK with VIN - VOUT higher than the FLAG assertion
drop voltage threshold (VFA.), then the FLAG asserts,
and the MAX14575A/MAX14575AL enter the autoretry
mode, the MAX14575B latches off the switch, and the
MAX14575C enters the continuous current-limit mode.
Autoretry (MAX14575A/MAX14575AL)
When the forward current reaches the current thresh-
old, the tBLANK timer begins counting (Figure 2). FLAG
asserts if the overcurrent condition is present for tBLANK.
The timer resets if the overcurrent condition disappears
before the blanking time (tBLANK) has elapsed. A retry
time delay (tRETRY) starts immediately after the blanking
time has elapsed and during that time, the switch latches
off. At the end of tRETRY, the switch turns on again. If the
fault still exists, the cycle repeats. If the fault has been
removed, the switch stays on. During this cycle, FLAG
stays low. In autoretry, if the die temperature exceeds
+160NC (typ) due to self-heating, the MAX14575A/
MAX14575AL go into thermal-shutdown mode until the
die temperature drops by approximately 20NC.
The autoretry feature saves system power in case of
an overcurrent or short-circuit condition. During tBLANK
time, when the switch is on, the supply current is held at
the current limit. During time tRETRY, when the switch is
off, the current through the switch is zero. Thus, the aver-
age output current is much less than the programmed
current limit. Calculate the average output current using
the following equation:
=
×
+
BLANK
LOAD
LIM
BLANK
RETRY
t
II
tt
For example, if tBLANK = 15ms and tRETRY = 500ms, the
duty cycle is 3%, resulting in a 97% power savings over
the switch being on the entire time.
Functional Diagram
MAX14575A
MAX14575AL
MAX14575B
MAX14575C
BUFFER
CONTROL
LOGIC
CURRENT
LIMIT
BANDGAP
REFERENCE
TIMING
CIRCUITRY
BUFFER
THERMAL
SHUTDOWN
OUT
IN
EN(EN)*
*PARENTHESES ARE FOR THE MAX14575AL ONLY
FLAG
SETI
REVERSE-CURRENT
PROTECTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2154L+ | 功能描述:网络控制器与处理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS2154LA2 | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS2154LA2+ | 功能描述:网络控制器与处理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS2154L-C01 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS2154LD1 | 功能描述:网络控制器与处理器 IC Enhanced E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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