參數(shù)資料
型號: LTC3411IMS
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10
封裝: PLASTIC, MSOP-10
文件頁數(shù): 9/24頁
文件大?。?/td> 247K
代理商: LTC3411IMS
LTC3411
17
3411fb
APPLICATIONS INFORMATION
The output voltage can now be programmed by choosing
the values of R1 and R2. To maintain high efciency, the
current in these resistors should be kept small. Choosing
2μA with the 0.8V feedback voltage makes R1~400k. A
close standard 1% resistor is 412k and R2 is then 887k.
The compensation should be optimized for these compo-
nents by examining the load step response but a good place
to start for the LTC3411 is with a 13kΩ and 1000pF lter.
The output capacitor may need to be increased depending
on the actual undershoot during a load step.
The PGOOD pin is a common drain output and requires
a pull-up resistor. A 100k resistor is used for adequate
speed.
Figure 1 shows the complete schematic for this design
example.
Board Layout Considerations
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3411. These items are also illustrated graphically
in the layout diagram of Figure 6. Check the following in
your layout:
1. Does the capacitor CIN connect to the power VIN (Pin 6)
and power GND (Pin 5) as close as possible? This capacitor
provides the AC current to the internal power MOSFETs
and their drivers.
2. Are the COUT and L1 closely connected? The (–) plate of
COUT returns current to PGND and the (–) plate of CIN.
3. The resistor divider, R1 and R2, must be connected
between the (+) plate of COUT and a ground line terminated
near SGND (Pin 3). The feedback signal VFB should be
routed away from noisy components and traces, such as
the SW line (Pin 4), and its trace should be minimized.
4. Keep sensitive components away from the SW pin. The
input capacitor CIN, the compensation capacitor CC and
CITH and all the resistors R1, R2, RT, and RC should be
routed away from the SW trace and the inductor L1.
5. A ground plane is preferred, but if not available, keep
the signal and power grounds segregated with small signal
components returning to the SGND pin at one point which
is then connected to the PGND pin.
6. Flood all unused areas on all layers with copper. Flood-
ing with copper will reduce the temperature rise of power
components. These copper areas should be connected to
one of the input supplies: PVIN, PGND, SVIN or SGND.
PVIN
LTC3411
PGND
SW
SVIN
SGND
PGOOD
VFB
SYNC/MODE
ITH
SHDN/RT
L1
VIN
BM
PS
VIN
VOUT
R5
RT
R3
R1
R2
3411 F06
C3
BOLD LINES INDICATE HIGH CURRENT PATHS
CIN
COUT
C4
Figure 6. LTC3411 Layout Diagram (See Board Layout Checklist)
相關(guān)PDF資料
PDF描述
LTC3411IDD#TR 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10
LTC3412AMPFE#TR 6 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16
LTC3412AMPFE 6 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16
LTC3412IFE#TR 6.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16
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