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參數(shù)資料
| 型號： | MAX4766 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Extended Common-mode RS-485 Transceiver 8-SOIC -40 to 85 |
| 中文描述： | 0.075A至1.5A、可編程限流開關(guān) |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | MAX4766 |
M
0.075A to 1.5A, Programmable
Current-Limit Switch
10
______________________________________________________________________________________
Applications Information
Setting the Current Limit
A resistor from SETI to ground programs the current-
limit value for the MAX4766. Table 2 lists various cur-
rent limits set by different resistor values. Use the
following formula to calculate the current limit:
Input Capacitor
Connect a capacitor from IN to ground to limit the input
voltage drop during momentary output short-circuit con-
ditions. A 2.2μF ceramic capacitor with less than 0.2
ESR is adequate for most applications. Higher capacitor
values further reduce the voltage drop at the input.
Output Capacitor
For stable operation over the full temperature range
and over the full-programmable current-limit range,
use a 2.2μF capacitor with less than 0.2
ESR from
OUT to ground.
If the load capacitance is too large, then current may
not have enough time to charge the capacitance and
the device assumes that there is a faulty load condition.
The maximum capacitive load value that can be driven
from OUT is obtained by the following formula:
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device (no more than 5mm).
IN and OUT pins must be connected with short traces
to the power bus. During normal operation, the power
dissipation is small and the package temperature
change is minimal. If the output is continuously shorted
to ground at the maximum supply voltage, the opera-
tion of the switches with the autoretry option does not
cause problems because the total power dissipated
during the short is scaled by the duty cycle:
Attention must be given to the latch-off version of the
MAX4766 where the latch-off condition must be manu-
ally reset by toggling ON from high to low. If the latch-
off time duration is not sufficiently high, it is possible for
the device to reach the thermal shutdown threshold and
never be able to turn the device on until it cools down.
P
MAX
V
I
t
t
t
IN MAX
_
OUT MAX
+
BLANK
RETRY
BLANK
=
×
×
_
C
MAX
I
t
V
FWD MIN
_
BLANK
IN
=
×
R
SETI
kV
I
k
LIM( )
=
112 5
R
SETI
(k
)
1500
1125
750
562.5
330
200.9
150
112.5
90
80.35
≤
75
TYPICAL CURRENT LIMIT (A)
0.075
0.1
0.15
0.2
0.375
0.56
0.75
1.0
1.25
1.4
1.5
Table 2. Current Limit vs. Resistor Values
Chip Information
TRANSISTOR COUNT: 1544
PROCESS: CMOS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4766BETA | 0.075A to 1.5A, Programmable Current-Limit Switch |
| MAX476 | 325MHz High-Speed Op Amp(425MHz，高速，開環(huán)運(yùn)算放大器) |
| MAX477 | 300MHz High-Speed Op Amp(300MHz 高速運(yùn)算放大器) |
| MAX4789EUK | 200mA/250mA/300mA Current-Limit Switches |
| MAX4789EUS | 200mA/250mA/300mA Current-Limit Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4766AETA | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LI - Rail/Tube |
| MAX4766AETA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4766AETA+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4766AETA-T | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LIMIT SWITCH - Tape and Reel |
| MAX4766BETA | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LI - Rail/Tube |
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