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參數(shù)資料
| 型號： | LTC3713 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Input Voltage, High Power, No RSENSE Synchronous Buck DC/DC Controller |
| 中文描述： | 低輸入電壓，高功率，無檢測電阻同步降壓DC / DC控制器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 325K |
| 代理商： | LTC3713 |
15
LTC3713
3713fa
APPLICATIU
due to a dropping input voltage for example, then the
output will drop out of regulation. The minimum input
voltage to avoid dropout is:
W
U
U
V
V
t
t
t
IN MIN
(
OUT
ON
OFF MIN
(
ON
)
)
=
+
Output Voltage Programming
A resistor divider connected between V
FB1
and V
OUT
sets
the output voltage according to the following equation:
V
V
R
R
OUT
F
F
=
+
0 8
.
1
2
1
External Gate Drive Buffers
The LTC3713 drivers are adequate for driving up to about
30nC into MOSFET switches with RMS currents of 50mA.
Applications with larger MOSFET switches or operating at
frequencies requiring greater RMS currents will benefit
from using external gate drive buffers such as the LTC1693.
Alternately, the external buffer circuit shown in Figure 5
can be used. Note that the bipolar devices reduce the
signal swing at the MOSFET gate.
Soft-Start and Latchoff with the RUN/SS Pin
The RUN/SS pin provides a means to shut down the
LTC3713 as well as a timer for soft-start and overcurrent
latchoff. Pulling the RUN/SS pin below 0.8V puts the
LTC3713 into a low quiescent current shutdown
(I
Q
< 30
μ
A). Releasing the pin allows an internal 1.2
μ
A
current source to charge up the external timing capacitor
C
SS
. If RUN/SS has been pulled all the way to ground,
there is a delay before starting of about:
t
V
AC
μ
s F C
1 3
.
/
DELAY
SS
SS
=
=
(
1 5
1 2
.
.
When the voltage on RUN/SS reaches 1.5V, the LTC3713
begins operating with a clamp on I
TH
of approximately
0.9V. As the RUN/SS voltage rises to 3V, the clamp on I
TH
is raised until its full 2.4V range is available. This takes an
additional 1.3s/
μ
F, during which the maximum load cur-
rent is reduced. During start-up the maximum load current
is reduced until either the RUN/SS pin rises to 3V or the
output reaches 75% of its final value. The pin can be driven
from logic as shown in Figure 6. Diode D1 reduces the start
delay while allowing C
SS
to charge up slowly for the soft-
start function.
After the controller has been started and given adequate
time to charge up the output capacitor, C
SS
is used as a
short-circuit timer. After the RUN/SS pin charges above
4V, if the output voltage falls below 75% of its regulated
value, then a short-circuit fault is assumed. A 1.8
μ
A cur-
rent then begins discharging C
SS
. If the fault condition
persists until the RUN/SS pin drops to 3.5V, then the con-
troller turns off both power MOSFETs, shutting down the
converter permanently. The RUN/SS pin must be actively
pulled down to ground in order to restart operation.
The overcurrent protection timer requires that the soft-
start timing capacitor C
SS
be made large enough to guar-
antee that the output is in regulation by the time C
SS
has
reached the 4V threshold. In general, this will depend upon
the size of the output capacitance, output voltage and load
current characteristic. A minimum soft-start capacitor can
Q1
FMMT619
GATE
OF M1
TG
BOOST
SW
Q2
FMMT720
Q3
FMMT619
GATE
OF M2
BG
10
3713 F05
INTV
CC
PGND
Q4
FMMT720
10
3.3V OR 5V
RUN/SS
V
IN
INTV
CC
RUN/SS
D1
(6a)
(6b)
D2*
C
SS
R
SS
*
C
SS
*OPTIONAL TO OVERRIDE
OVERCURRENT LATCHOFF
R
SS
*
3713 F06
Figure 5. Optional External Gate Driver
Figure 6. RUN/SS Pin Interfacing with Latchoff Defeated
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