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| 型号： | LT1373IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 35 V |
| 输入电压： | 2.7 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1373
APPLICATIO S I FOR ATIO
V RIPPLE = output ripple (V P-P )
g m = error amplifier transconductance ( ≈ 375 μ mho)
R C = series resistor on V C pin
V OUT = DC output voltage
To prevent irregular switching, V C pin ripple should be
kept below 50mV P-P . Worst-case V C pin ripple occurs at
The high speed switching current path is shown schemati-
cally in Figure 3. Minimum lead length in this path is
essential to ensure clean switching and low EMI. The path
including the switch, output diode and output capacitor is
the only one containing nanosecond rise and fall times.
Keep this path as short as possible.
maximum output load current and will also be increased if
poor quality (high ESR) output capacitors are used. The
addition of a 0.001 μ F capacitor on the V C pin reduces
switching frequency ripple to only a few millivolts. A low
L1
SWITCH
NODE
HIGH
V OUT
value for R C will also reduce V C pin ripple, but loop phase
margin may be inadequate.
V IN
FREQUENCY
CIRCULATING
PATH
LOAD
Switch Node Considerations
For maximum efficiency, switch rise and fall time are made
as short as possible. To prevent radiation and high fre-
Figure 3
LT1373 ? F03
quency resonance problems, proper layout of the compo-
nents connected to the switch node is essential. B field
(magnetic) radiation is minimized by keeping output di-
ode, switch pin and output bypass capacitor leads as short
as possible. E field radiation is kept low by minimizing the
length and area of all traces connected to the switch pin.
A ground plane should always be used under the switcher
circuitry to prevent interplane coupling.
TYPICAL APPLICATIO N S N
Positive-to-Negative Converter with Direct Feedback
More Help
For more detailed information on switching regulator
circuits, please see AN19. Linear Technology also offers a
computer software program, SwitcherCAD TM , to assist in
designing switching converters. In addition, our applica-
tions department is always ready to lend a helping hand.
SwitcherCAD is a trademark of Linear Technology Corporation.
Dual Output Flyback Converter with Overvoltage Protection
V IN
R2
R1
+
?
MAX I OUT
V IN
+
+
R4
OFF
2.7V TO 16V
C1
22 μ F
5
V IN
ON 4 S/S V SW
LT1373
NFB
V C GND
1 6, 7
C2
0.01 μ F
R1
5k
8
3
T1*
2 4
D2
P6KE-15A
D3
1N4148 1 ? 3
D1
MBRS130LT3
?
I OUT V IN
0.3A 3V
0.5A 5V
0.75A 9V
+
C3
47 μ F
R2
2.55k
1%
R3
2.49k
1%
–V OUT ?
–5V
+
OFF
275k
1%
C1
100 μ F
2
FB
ON 4 S/S
V C
1
V IN
4.75V TO 13V
5
8
V SW
LT1373
3
NFB
GND
6, 7
302.6k
1%
2, 3
P6KE-20A ?
1N4148
6, 7
MBRS140T3
T1*
5
? 4
8
?
1
MBRS140T3
V OUT
15V
C3
47 μ F
C4
47 μ F
–V OUT
–15V
12.4k
1%
*COILTRONICS CTX20-2 (407) 241-7876
LT1373 ? TA03
C2
0.01 μ F
R3
R5
2.49k
1%
5k
10
*DALE LPE-4841-100MB (605) 665-9301
LT1373 ? TA04
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| LT1374CFE#PBF | 功能描述:IC REG BUCK ADJ 4.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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