參數(shù)資料
型號(hào)： LT1956-5IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 437K
代理商： LT1956-5IGN
16
LT1956/LT1956-5
Frequency Compensation section for a discussion of an
entirely different cause of subharmonic switching before
assuming that the cause is insufficient slope compensa-
tion. Application Note 19 has more details on the theory
of slope compensation.
At power-up, when VC is being clamped by the FB pin (see
Figure 2, Q2), the sync function is disabled. This allows the
frequency foldback to operate in the shorted output con-
dition. During normal operation, switching frequency is
controlled by the internal oscillator until the FB pin reaches
0.8V, after which the SYNC pin becomes operational. If no
synchronization is required, this pin should be connected
to ground.
LAYOUT CONSIDERATIONS
As with all high frequency switchers, when considering
layout, care must be taken in order to achieve optimal
electrical, thermal and noise performance. For maximum
efficiency, switch rise and fall times are typically in the
nanosecond range. To prevent noise both radiated and
conducted, the high speed switching current path, shown
in Figure 5, must be kept as short as possible. This is
implemented in the suggested layout of Figure 6. Shorten-
ing this path will also reduce the parasitic trace inductance
of approximately 25nH/inch. At switch off, this parasitic
inductance produces a flyback spike across the LT1956
switch. When operating at higher currents and input
voltages, with poor layout, this spike can generate volt-
ages across the LT1956 that may exceed its absolute
maximum rating. A ground plane should always be used
under the switcher circuitry to prevent interplane coupling
and overall noise.
APPLICATIO S I FOR ATIO
WU
UU
1956 F05
5V
L1
VIN
LT1956
D1
C3
HIGH
FREQUENCY
CIRCULATING
PATH
LOAD
Figure 5. High Speed Switching Path
Figure 6. Suggested Layout (Topside Only Shown)
GND
SHDN
SYNC
GND
BOOST
VIN
SW
PLACE FEEDTHROUGH AROUND
GROUND PINS (4 CORNERS) FOR
GOOD THERMAL CONDUCTIVITY
LT1956
C3
C1
D1
C2
D2
R2
R1
1956 F06
CC
L1
MINIMIZE LT1956
C3-D1 LOOP
GND
BIAS
FB
VC
CONNECT TO
GROUND PLANE
KELVIN SENSE
VOUT
KEEP FB AND VC COMPONENTS
AWAY FROM HIGH FREQUENCY,
HIGH CURRENT COMPONENTS
GND
VOUT
VIN
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