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參數(shù)資料
| 型號(hào)： | GM2526LS8R |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | USB電源控制／開(kāi)關(guān) |
| 英文描述： | DUAL USB POWER SWITCH |
| 中文描述： | 雙USB電源開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 340K |
| 代理商： | GM2526LS8R |
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FUNCTIONAL DESCRIPTION
The GM2526-H (active-high) and GM2526-L (active-low) are dual high-side switches. Fault conditions turn off
(or inhibit turn-on) of one or more of the output transistors, depending upon the type of fault, activate the open-
drain error flag transistors, and sinking current to ground.
Input and Output
IN (input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUTx (out-
put) is the source of its respective MOSFET. In a typical application, current flows through the switch from IN to
OUT toward the load. If V
is greater than V
when a switch is enabled, current will flow from OUT to IN
OUT
IN
since the MOSFET is bidirectional when active. The output MOSFET and driver circuitry are also designed to al-
low the MOSFET source to be externally forced to a higher voltage than the drain (V
> V ) when the output
OUT
IN
is off. In this situation, the GM2526 avoids undesirable current flow from OUT to IN. If V
falls below 2.5V,
IN
and UVLO disables both switches.
Thermal Shutdown
Thermal shutdown shuts off the affected output MOSFETs and signals all fault flags if the die temperature ex-
ceeds 135°C. Hysteresis of 10°C pre-vents the switch from turning on until the die temperature drops to 125°C.
Note: over-temperature detection functions only when at least one switch is enabled.
Current Limit Induced Thermal Shutdown
GM2526 raises the output MOSFET on-resistance until series combination of the MOSFET on-resistance and
load impedance limit current to 850mA (typ.). Normally the increased power dissipation will activate thermal
shutdown, and disabling affected channels of GM2526. If you prefer to avoid this, you can respond to the fault
and disable the current limited channel externally before GM2526 reaches shutdown temperature. The time be-
tween the flag indicates a current limit fault and thermal shutdown depends on ambient temperature, board lay-
out, and load impedance. But, you will have typically a few hundred milliseconds. If you do not want GM2526 to
go into thermal shutdown, the USB controller recognize a fault and disable the appropriate channel within this
time. If the fault is not removed or the switch is not disabled within this time, then GM2526 will experience ther-
mal oscillation of about 2Hz. This does not damage GM2526.
Undervoltage Lockout
UVLO prevents the output MOSFET from turning on until V
exceeds approximately 2.5V. Until turn-on, the
IN
FLAG will be low. After the switch turns on, UVLO signals the fault flag and shuts off the output MOSFET if the
voltage drops below approximately 2.3V. Undervoltage detect functions only when at least one switch is en-
abled.
Current Sensing and Limiting
The current-limit threshold is preset internally. The preset level prevents damage to the output MOSFET and ex-
ternal load, but allows a minimum current of 0.5A through each channel's output MOSFET. The current-limit cir-
cuit senses a portion of the output MOSFET switch current. The current sense resistor shown in the block dia-
gram is virtual and has no voltage drop. The reaction to an overcurrent condition varies according to the circum-
stances: (a) If a switch is powered on or enabled into a heavy load or short-circuit, the switch immediately goes
into a constant-current mode, and reducing the output voltage. The fault flag goes low until the load is reduced.
(b) When a heavy load is applied, a large transient current may flow until the current limit circuitry responds. At
which point the device limits current to less than the short-circuit current limit specification. (C) GM2526 current-
limit profile exhibits a small (~500mA) foldback effect. Once past the current-limit threshold, GM2526 operates
in constant-current mode (see "short circuit current limit" in the Electrical Characteristics).
Note, GM2526 will deliver load current up to the current-limit threshold, typically 1.6A.
Fault Flag
FLG is an N-channel, open-drain MOSFET output. The faultflag is active (low) for one or more of the following
conditions: undervoltage current limit, or thermal shutdown. The flag output MOSFET can sink a 10mA load to
100mV (typically) above ground. You can "wire NOR" multiple FLG pins to a common pull-up resistor.
Power Management
A
MICROELECTRONICS
GM2526
Power Management
DUAL USB POWER SWITCH
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GM2526LS8T | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DUAL USB POWER SWITCH |
| GM2574 | 制造商:GAMMA 制造商全稱(chēng):GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
| GM2574-3.3S8R | 制造商:GAMMA 制造商全稱(chēng):GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
| GM2574-3.3S8T | 制造商:GAMMA 制造商全稱(chēng):GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
| GM2574-5.0S8R | 制造商:GAMMA 制造商全稱(chēng):GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
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