參數(shù)資料
型號(hào): LT1959C
廠商: Linear Technology Corporation
元件分類: 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> 292K
代理商: LT1959C
15
LT1959
APPLICATIO
S I
FOR
ATIO
U
from the switch node. Also note that the high current
ground path of the catch diode and input capacitor are kept
very short and separate from the analog ground line.
The high speed switching current path is shown schemati-
cally in Figure 6. Minimum lead length in this path is
essential to ensure clean switching and low EMI. The path
including the switch, catch diode, and input capacitor is
W
U
U
the only one containing nanosecond rise and fall times. If
you follow this path on the PC layout, you will see that it is
irreducibly short. If you move the diode or input capacitor
away from the LT1959, get your resumé in order. The
other paths contain only some combination of DC and
500kHz triwave, so are much less critical.
Figure 5. Suggested Layout (Topside Only Shown)
Figure 6. High Speed Switching Path
1
U1
C1
CONNECT TO
GROUND PLANE
KEEP FB AND V
COMPONENTS
AWAY FROM HIGH FREQUENCY,
HIGH CURRENT COMPONENTS
PLACE FEEDTHROUGHS
AROUND GND PIN FOR GOOD
THERMAL CONDUCTIVITY
R3
D2
C4
R2
L1
1959 F05
C5
C6
GND
V
OUT
D1
C3
V
IN
GND
CONNECT TO
GROUND PLANE
MINIMIZE LT1959 C3, D1 LOOP
KELVIN SENSE
V
OUT
TAKE OUTPUT
DIRECTLY FROM
END OF OUTPUT
CAPACITOR
1959 F06
5V
L1
V
IN
HIGH
FREQUENCY
CIRCULATING
PATH
LOAD
SWITCH NODE
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