參數(shù)資料
型號(hào)： LT3724
廠(chǎng)商： Linear Technology Corporation
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 240K
代理商： LT3724
LT3724
15
3724f
Figure 3. Undervoltage Lockout Circuit
APPLICATIOU
W
U
U
If additional hysteresis is desired for the enable function,
an external positive feedback resistor can be used from the
LT3724 regulator output.
The shutdown function can be disabled by connecting the
SHDN pin to the V
IN
through a large value pull-up resistor.
This pin contains a low impedance clamp at 6V, so the
SHDN pin will sink current from the pull-up resistor(R
PU
):
I
V
V
R
SHDN
IN
PU
=
– 6
Because this arrangement will clamp the SHDN pin to the
6V, it will violate the 5V absolute maximum voltage rating
of the pin. This is permitted, however, as long as the
absolute maximum input current rating of 1mA is not
exceeded. Input SHDN pin currents of <100
μ
A are recom-
mended: a 1M
or greater pull-up resistor is typically
used for this configuration.
Soft-Start
The soft-start function forces the programmed slew rate
while the converter output rises to 95% of regulation,
which corresponds to 1.185V on the V
FB
pin. Once 95%
regulation is achieved, the soft-start circuit is disabled.
The soft-start circuit will re-enable when the V
FB
pin drops
below 70% of regulation, which corresponds to 300mV of
control hysteresis on the V
FB
pin. This allows for a con-
trolled recovery from a “brown-out” condition.
Figure 2. Output Voltage Feedback Divider
The V
FB
pin input bias current is typically 25nA, so use of
extremely high value feedback resistors could cause a
converter output that is slightly higher than expected. Bias
current error at the output can be estimated as:
V
OUT(BIAS)
= 25nA R2
Supply UVLO and Shutdown
The SHDN pin has a precision voltage threshold with
hysteresis which can be used as an undervoltage lockout
threshold (UVLO) for the power supply. Undervoltage
lockout keeps the LT3724 in shutdown until the supply
input voltage is above a certain voltage programmed by
the user. The hysteresis voltage prevents noise from
falsely tripping UVLO.
Resistors are chosen by first selecting RB. Then
RA
RB
V
V
SUPPLY ON
.
1 35
=
–
(
)
1
V
SUPPLY(ON)
is the input voltage at which the undervoltage
lockout is disabled and the supply turns on.
Example: Select RB = 49.9k
, V
SUPPLY(ON)
= 14.5V
(based on a 15V minimum input voltage)
RA
k
V
V
=
49 9
14 5
1 35
.
1
.
.
–
= 486.1k
(499k
resistor is selected)
If low supply current in standby mode is required, select
a higher value of RB.
The supply turn off voltage is 9% below turn on. In the
example the V
SUPPLY(OFF)
would be 13.2V.
L1
V
FB
PIN
R2
R1
V
OUT
C
OUT
3724 F02
SHDN PIN
RA
RB
V
SUPPLY
3724 F03
R
SS
LT3724
V
OUT
C
SS1
C
SS
3724 F04
A
Figure 4.Soft-Start Circuit
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