参数资料
| 型号： | LT3782EUFD#PBF |
| 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-QFN |
| 标准包装： | 73 |
| 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-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
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
相关PDF资料 |
PDF描述 |
|---|---|
| LT3800IFE#PBF | IC REG CTRLR INV PWM CM 16-TSSOP |
| LT3804EFE#PBF | IC REG CTRLR ISO PWM 28-TSSOP |
| LT3825EFE#PBF | IC REG CTRLR FLYBK ISO 16-TSSOP |
| LT3837EFE#PBF | IC REG CTRLR FLYBK ISO 16-TSSOP |
| LT3844EFE#PBF | IC REG CTRLR BST INV PWM 16TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3782EUFD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-UP DC/DC Controller |
| LT3782EUFD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-UP DC/DC Controller |
| LT3782IFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-UP DC/DC Controller |
| LT3782IFE#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3782IFE#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
发布紧急采购，3分钟左右您将得到回复。