参数资料
| 型号： | LT3782EUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20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
Δ V OUT
ForagivenV IN andV OUT ,wecancalculatethedutycycleD
and then derive the output RMS ripple current from Figure
6. After choosing output capacitors with suf?cient RMS
ripple current rating, we also need to consider the ESR
requirement if electrolytic caps, tantulum caps, POSCAPs
or SP CAPs are selected. Given the required output ripple
voltage spec ΔV OUT (in RMS value) and the calculated RMS
ripple current ΔI OUT , one can estimate the ESR value of
the output capacitor to be
ESR ≤
Δ I OUT
External Regulator to Bias Gate Drivers
For applications with V IN higher than 24V, the IC temperature
may get too high. To reduce heat, an external regulator
between 12V to 14V should be used to override the internal
V GBIAS regulator to supply the current needed for BGATE1
and BGATE2 (see Figure 7).
Ef?ciency Considerations
The ef?ciency of a switching regulator is equal to the out-
put power divided by the input power (￥100%). Percent
ef?ciency can be expressed as:
% Ef?ciency = 100% – (L1 + L2 + L3 + …),
where L1, L2, etc. are the individual loss components
as a percentage of the input power. It is often useful to
analyze individual losses to determine what is limiting
the ef?ciency and which change would produce the most
improvement. Although all dissipative elements in the
circuit produce losses, four main sources usually ac-
count for the majority of the losses in LT3782 application
circuits:
1. The supply current into V IN . The V IN current is the sum
of the DC supply current I Q (given in the Electrical Char-
acteristics) and the MOSFET driver and control currents.
The DC supply current into the V IN pin is typically about
7mA and represents a small power loss (much less
than 1%) that increases with V IN . The driver current
results from switching the gate capacitance of the power
MOSFET; this current is typically much larger than the
DC current. Each time the MOSFET is switched on and
then off, a packet of gate charge Q G is transferred from
GBIAS to ground. The resulting dQ/dt is a current that
must be supplied to the GBIAS capacitor through the
V IN pin by an external supply. In normal operation:
I Q(TOT) ≈ I Q = f ? Q G
P IC = V IN ? (I Q + f ? Q G )
LT3782
3782 F07
GBIAS
GBIAS1
GBIAS2
2μF
12V
+
Figure 7
3782fg
14
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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 |
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