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| 型号： | LT3782IFE#TRPBF |
| 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-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
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 |
|---|---|
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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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