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参数资料
| 型号： | LT3782IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 533kHz |
| 占空比： | 94% |
| 电源电压： | 6 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3782
APPLICATIONS INFORMATION
From a known power dissipated in the power MOSFET, its
junction temperature can be obtained using the following
formula:
will further reduce the input capacitor ripple current rating.
The ripple current is plotted in Figure 5. Please note that
the ripple current is normalized against
T J = T A + P FET ? R TH(JA)
The R TH(JA) to be used in this equation normally includes
the R TH(JC) for the device plus the thermal resistance from
I norm =
V IN
L ? f s
the case to the ambient temperature (R TH(CA) ). This value
of T J can then be compared to the original, assumed value
used in the iterative calculation process.
Input Capacitor Choice
The input capacitor must have high enough voltage and
ripple current ratings to handle the maximum input voltage
and RMS ripple current rating. The input ripple current in
a boost circuit is very small because the input current is
continuous. With 2-phase operation, the ripple cancellation
1.00
0.90
0.80
0.70
Output Capacitor Selection
The voltage rating of the output capacitor must be greater
than the maximum output voltage with suf?cient derat-
ing. Because the ripple current in output capacitor is a
pulsating square wave in a boost circuit, it is important
that the ripple current rating of the output capacitor be
high enough to deal with this large ripple current. Figure
6 shows the output ripple current in the 1- and 2-phase
designs. As we can see, the output ripple current of a
2-phase boost circuit reaches almost zero when the duty
cycle equals 50% or the output voltage is twice as much as
the input voltage. Thus the 2-phase technique signi?cantly
reduces the output capacitor size.
3.25
0.60
0.50
0.40
0.30
0.20
1-PHASE
2-PHASE
3.00
2.75
2.50
2.25
2.00
1.75
0.10
1.50
1-PHASE
0
0
0.2
0.4
0.6
0.8
1.0
1.25
1.00
DUTY CYCLE
3782 F04
0.75
0.50
2-PHASE
I norm =
V IN
L ? f s
0.25
0
0.1
0.2
0.3 0.4 0.5 0.6 0.7
DUTY CYCLE OR (1-V IN /V OUT )
0.8
0.9
The RMS Ripple Current is About 29% of
3782 F05
the Peak-to-Peak Ripple Current.
Figure 6. Normalized Output RMS Ripple Currents in Boost
Figure 5. Normalized Input Peak-to-Peak Ripple Current
Converter: 1-Phase and 2-Phase. I OUT Is the DC Output Current.
3782fg
13
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相关代理商/技术参数 |
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| LT3791EFE#TRPBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3791EFE-1#PBF | 制造商:Linear Technology 功能描述:LED DRVR 9V/12V/15V/18V/24V 38-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK BST 38TSSOP 制造商:Linear Technology 功能描述:BUCK/BOOST 4.7/60V 700KHZ 3 制造商:Linear Technology 功能描述:BUCK/BOOST, 4.7/60V, 700KHZ, 38TSSOP 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK-BOOST, 700KHZ, 60V, TSSOP-38; Input Voltage:60V; Output Current:10A; Digital IC Case Style:TSSOP; No. of Pins:38; Frequency:700kHz; Operating Temperature Min:-40C; Operating Temperature Max:125C ;RoHS Compliant: Yes |
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