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参数资料
| 型号： | LT1171ITTR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封装： | PLASTIC, TO-220, 5 PIN |
| 文件页数： | 2/20页 |
| 文件大小： | 278K |
| 代理商： | LT1171ITTR |
10
LT1170/LT1171/LT1172
117012ff
Synchronizing with MOS Transistor
Synchronizing with Bipolar 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*
OPERATIO
U
With tS = 0.2s, 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.
TYPICAL APPLICATIO S
U
Flyback Converter
1170/1/2 TA03
D1
C1
2000
F
C4*
100
F
C2
0.15
F
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
5
H
C4
100
F
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1171M | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1171MK | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1171MK/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| LT1172 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1172C | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
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