參數(shù)資料
型號(hào)： LT4256-3IGN
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Positive High Voltage Hot Swap Controller with Open-Circuit Detect
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 305K
代理商： LT4256-3IGN
LT4256-3
7
42563f
PIU
GATE (Pin 13):
High Side Gate Drive for the External
N-Channel MOSFET. An internal charge pump guarantees
at least 10V of gate drive for V
CC
supply voltages above
20V and 4.5V of gate drive for V
CC
supply voltages
between 10.8V and 20V. The rising slope of the voltage on
GATE is set by an external capacitor connected from GATE
to GND and an internal 30
μ
A pull-up current source from
the charge pump output.
If the current limit is reached, the GATE voltage is adjusted
to maintain a constant voltage across the sense resistor
while the timing capacitor starts to charge. If the TIMER
voltage ever exceeds 4.65V, GATE is pulled low.
GATE is also pulled to GND whenever UV is pulled low; the
V
CC
supply voltage drops below the externally programmed
undervoltage threshold, above the overvoltage threshold
or below the internal UVLO threshold (9.8V).
GATE is clamped internally to a maximum voltage of 11.6V
(typ) above V
OUT
under normal operating conditions.
Driving this pin beyond the clamp voltage may damage the
part. GATE is also clamped to 2V (typ) below V
OUT
. When
the gate is commanded off due to a fault condition, it is
discharged quickly by a 62mA (typ) capable switch until
GATE is 2V (typ) below V
OUT
. When GATE is below V
OUT
by 2V, the 62mA is reduced to 130
μ
A to protect the
LT4256-3 against damage if V
OUT
has large capacitance.
A Zener diode is needed between the gate and source of the
external MOSFET to protect its gate oxide under instanta-
neous short-circuit conditions. See Applications Informa-
tion.
SENSE (Pin 15):
Current Limit Sense Input. A sense
resistor is placed in the supply path between V
CC
and
SENSE. The current limit circuit regulates the voltage
across the sense resistor (V
CC
– SENSE) to 55mV while in
current limit when FB is 2V or higher. If FB drops below
2V, the regulated voltage across the sense resistor de-
creases linearly and stops at 14mV when FB is 0V. The
OPEN output also uses SENSE to detect when the output
current is less than (3mV)/R5.
To defeat current limit, connect SENSE to V
CC
.
V
CC
(Pin 16):
Input Supply Voltage. The positive supply
input ranges from 10.8V to 80V for normal operation. I
CC
is typically 1.8mA. An internal circuit disables the LT4256-3
for inputs less than 9.8V (typ).
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