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参数资料
| 型号： | MAX4766AETA-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 0.075A to 1.5A, Programmable Current-Limit Switch |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEEC, TINY, TDFN-8 |
| 文件页数： | 12/12页 |
| 文件大小： | 326K |
| 代理商： | MAX4766AETA-T |
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
_______________________________________________________________________________________
9
Autoretry (MAX4766A)
When the forward current-limit threshold is exceeded,
the tBLANK timer begins counting (Figure 3). The timer
resets if the overcurrent condition disappears before
tBLANK has elapsed. A retry time delay (tRETRY) starts
immediately after tBLANK has elapsed and during that
time, the switch turns 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. The autoretry feature saves system power in the
case of an overcurrent or short-circuit condition. During
tBLANK, when the switch is on, the supply current is at
the current limit. During tRETRY, when the switch is off,
the current through the switch is zero. Instead of
observing the full load current, the switch sees the
equivalent load current times duty cycle or:
With a typical tBLANK = 15ms and typical tRETRY =
150ms, the duty cycle is 10%, which results in a 90%
power savings over the switch being on the entire time.
Continuous Current Limit
In the continuous current-limit version of the MAX4766,
the output stays at the current limit until the output load
reduces. In this case, FLAG asserts as soon as there is
current limit without waiting for blanking time and
deasserts as soon as a short-circuit condition is
removed. In this current mode, if the thermal power rat-
ing of the package is exceeded, the device will go into
thermal shutdown and will not operate until the die tem-
perature has cooled.
Latch-Off
When the forward current-limit threshold is exceeded,
tBLANK timer begins counting. The timer resets if the
overcurrent condition disappears before tBLANK has
elapsed. The switch turns off and FLAG asserts if the
overcurrent condition continues beyond the blanking
time. Reset the switch by either toggling ON (Figure 2a)
or cycling the input voltage (Figure 2b).
Reverse-Current Protection
The MAX4766 features a reverse-current protection cir-
cuitry to limit the current back flow to 1A when the out-
put voltage exceeds the input voltage by a 100mV.
During this period, the switch turns off and FLAG
asserts (MAX4766B/C) without waiting for tBLANK time to
elapse. If at this point the output voltage drops below
input +100mV, the switch turns on and FLAG deasserts
(MAX4766B/C).
Thermal Shutdown
A thermal-shutdown circuitry protects the devices from
overheating. The switch turns off and FLAG goes
(MAX4766B/C) low immediately (no fault blanking)
when the junction temperature exceeds +150°C. The
MAX4766B (latch-off) does not turn on again until ON is
cycled from high to low to high. The MAX4766A
(autoretry) and the MAX4766C (continuous) turn the
switch on again after the device temperature drops
approximately +15°C.
F
FL
LA
AG
G Indicator
FLAG is an open-drain fault indicator output and
requires an external pullup resistor to a DC supply
(usually IN). FLAG goes low when any of the following
conditions occur:
The device is in current limit for more than the fault-
blanking period in the case of MAX4766B.
The device is in current limit in the case of MAX4766C
(no blanking time).
The switch is in autoretry mode.
The OUT voltage is above the IN voltage by more
than 100mV.
The die temperature exceeds the thermal-shutdown
temperature limit of the +15°C.
II
SUPPLY
LOAD
t
tt
BLANK
RETRY
=
+
Figure 3. Autoretry Fault-Blanking Diagram
LOAD
CURRENT
SWITCH
STATUS
tBLANK
OFF
ON
tRETRY
CURRENT
LIMIT
SHORT
REMOVED
tBLANK
相关PDF资料 |
PDF描述 |
|---|---|
| MAX4766BETA-T | 0.075A to 1.5A, Programmable Current-Limit Switch |
| MAX4766CETA+ | 0.075A to 1.5A, Programmable Current-Limit Switch |
| MAX4766CETA+T | 0.075A to 1.5A, Programmable Current-Limit Switch |
| MAX4766BETA+ | 0.075A to 1.5A, Programmable Current-Limit Switch |
| MAX4766BETA+T | 0.075A to 1.5A, Programmable Current-Limit Switch |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4766BETA | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LI - Rail/Tube |
| MAX4766BETA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4766BETA-T | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LIMIT SWITCH - Tape and Reel |
| MAX4766CETA | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LI - Rail/Tube |
| MAX4766CETA+ | 制造商:Maxim Integrated Products 功能描述:CURRENT LIMIT SW 1-IN 1-OUT 2.25V TO 4.5V 640A 8TDFN EP - Rail/Tube |
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