參數(shù)資料
型號： LTC1709-9
廠商： Linear Technology Corporation
英文描述： CHOKE COIL 33UH 260MA SMD
中文描述： 2相，5位VID，電流模式，高效率同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 18/28頁
文件大?。?/td> 319K
代理商： LTC1709-9
18
LTC1709-7
APPLICATIU
Table 1. VID Output Voltage Programming
VID4
VID3
VID2
W
U
U
Soft-Start/Run Function
The RUN/SS pin provides three functions: 1) Run/Shut-
down, 2) soft-start and 3) a defeatable short-circuit latchoff
timer. Soft-start reduces the input power sources’ surge
currents by gradually increasing the controller’s current
limit I
TH(MAX)
. The latchoff timer prevents very short,
extreme load transients from tripping the overcurrent
latch. A small pull-up current (>5
μ
A) supplied to the RUN/
SS pin will prevent the overcurrent latch from operating.
The following explanation describes how the functions
operate.
An internal 1.2
μ
A current source charges up the soft-start
capacitor, C
SS
.
When the voltage on RUN/SS reaches
1.5V, the controller is permitted to start operating. As the
voltage on RUN/SS increases from 1.5V to 3.0V, the
internal current limit is increased from 25mV/R
SENSE
to
75mV/R
SENSE
. The output current limit ramps up slowly,
taking an additional 1.4s/
μ
F to reach full current. The
output current thus ramps up slowly, reducing the starting
surge current required from the input power supply. If
RUN/SS has been pulled all the way to ground there is a
delay before starting of approximately:
t
V
AC
μ
s F C
/
DELAY
SS
SS
=
=
(
)
1 5
1 2
.
1 25
.
.
The time for the output current to ramp up is then:
t
V
1 2
.
V
A
C
s F C
/
IRAMP
SS
SS
=
μ
=
(
)
3
1 5
.
1 25
.
By pulling the RUN/SS pin below 0.8V the LTC1709-7 is
put into low current shutdown (I
Q
< 40
μ
A). The RUN/SS
pins can be driven directly from logic as shown in Figure
6. Diode D1 in Figure 6 reduces the start delay but allows
C
SS
to ramp up slowly providing the soft-start function.
The RUN/SS pin has an internal 6V zener clamp (see
Functional Diagram).
VID1
VID0
LTC1709-7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2.000V
1.950V
1.900V
1.850V
1.800V
1.750V
1.700V
1.650V
1.600V
1.550V
1.500V
1.450V
1.400V
1.350V
1.300V
*
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
1.050V
1.025V
1.000V
0.975V
0.950V
0.925V
No_CPU/
Shutdown*
*Represents codes without a defined output voltage as specified in Intel
specifications. The LTC1709-7 interprets these codes as a valid input and
produces an output voltage as follows:
(11111) = 0.900V
(01111) = 1.250V
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LTC1709EG7 制造商:Linear Technology 功能描述:
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