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參數(shù)資料
| 型號(hào)： | GM2526HS8T |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 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)： | 7/9頁(yè) |
| 文件大?。?/td> | 340K |
| 代理商： | GM2526HS8T |
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APPLICATION INFORMATION
Supply Filtering
To control supply transients, place a 0.1F to 1F bypass capacitor from IN to GND right at GM2526. Without
this bypass capacitor, an output short can cause ringing from supply lead inductance on the input and damage
the internal control circuitry.
Input or output transients must never exceed the absolute maximum supply voltage (V
= 6V).
IN max
Figure1. Supply Bypassing
Enable Input
EN must been driven logic high or logic low for a clearly defined input. Floating the input will have unpredictable
(but certainly undesirable) results. EN must never be allowed to go negative with respect to GND.
Soft Start
The GM2526 has high impedance when off, which gradually shifts to a low impedance as the chip turns on.
This reduces the inrush current and voltage drop, which occured when charging a capacitive load, thus meet-
ing the USB voltage drop requirements for bus-powered applications as shown in Figure 3.
You can use the soft start circuit shown in Figure 4 to meet USB transient regulation specifications with large
load capacitances (C
> 10uF). GM2526 provides inrush current limiting for these applications
BULK
Transient Overcurrent Filter
When GM2526 is turned on, large capacitance values at the output of GM2526 cause the inrush current to
cross GM2526's short circuit current-limit threshold and assert the flag. The duration of this situation depends
on the value of the output capacitance.
Figure 2. Transient Filter
While the capacitors are charging, GM2526 enters into
Into constant-current mode. As the capacitance is charged, the current decreases below the short circuit cur-
rent-limit threshold, and the flag is deasserted. In USB applications, output bulk capacitance must be used to
support hot-plug events. When the GM2526 is enabled, the flag may go active for about 1ms due to inrush cur-
rent exceeding the current-limit setpoint. During hot-plug events, inrush currents may also cause the flag to go
active for about 30s. Since these situations are not relevant overcurrent faults, the USB controller must ignore
the flag during these events. To prevent needless overcurrent reporting, you can use a 1ms RC filter as shown
in Figure 2, or you can program a 1ms debounce routine, which may be programmed into the USB logic control-
ler.
3V to 5.5V
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
0.1F to 1F
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
OVERCURRENT
USB Controller
10k
0.1F
GM2526
+
V
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 |
|---|---|
| GM2526LS8R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DUAL USB POWER SWITCH |
| GM2526LS8T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DUAL USB POWER SWITCH |
| GM2574 | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
| GM2574-3.3S8R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
| GM2574-3.3S8T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS |
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