參數(shù)資料
型號(hào): LT1171CT#FLOW-06PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PZFM5
封裝: LEAD FREE, PLASTIC, TO-220, 5 PIN
文件頁(yè)數(shù): 3/24頁(yè)
文件大?。?/td> 225K
代理商: LT1171CT#FLOW-06PBF
LT1170/LT1171/LT1172
11
117012fg
OPERATION
With tS = 0.2μs, fS = 150kHz, VC = 1.5V, and R3 = 2k, offset
voltage shift is ≈ 3.8mV. This is not particularly bother-
some, but note that high offsets could result if R3 were
reduced to a much lower value. Also, the synchronizing
transistor must sink higher currents with low values of
R3, so larger drives may have to be used. The transistor
must be capable of pulling the VC pin to within 200mV of
ground to ensure synchronizing.
Synchronizing with Bipolar Transistor
Synchronizing with MOS Transistor
1170/1/2 OP01
C2
39pF
R1
3k
R2
2.2k
LT1170
GND
VIN
VC
C1
R3
2N2369
FROM 5V
LOGIC
1170/1/2 OP02
D1
1N4158
R2
2.2k
LT1170
GND
VIN
VC
C1
R3
FROM 5V
LOGIC
C2
100pF
D2
1N4158
* SILICONIX OR EQUIVALENT
VN2222*
TYPICAL APPLICATIONS
Flyback Converter
1170/1/2 TA03
D1
C1
2000μF
C4*
100μF
C2
0.15μF
R1
3.74k
R2
1.24k
VIN
20V TO 30V
R3
1.5k
*REQUIRED IF INPUT LEADS ≥ 2"
LT1170
VIN
VSW
FB
VC
OPTIONAL
FILTER
L2
5μH
C4
100μF
VOUT
5V
6A
VSNUB
CLAMP TURN-ON
SPIKE
PRIMARY FLYBACK VOLTAGE =
LT1170 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
PRIMARY CURRENT
SECONDARY CURRENT
LT1170 SWITCH CURRENT
SNUBBER DIODE CURRENT
VOUT + Vf
N
0V
VIN
a
b
0V
c
d
VOUT + Vf
N VIN
I
IPRI
0
IPRI/N
IPRI
t =
(IPRI)(LL)
VSNUB
0
1
N* = 1/3
N*
D3
25V
1W
D2
MUR110
GND
+
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