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| 型号： | LT3782IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20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
then R FREQ1 + R FREQ2 should be 80k and V DELAY should
be 1V, with V RSET = 2.3V then R FREQ1 = 47.5k and R FREQ2
= 32.5k (see Figure 3).
Duty Cycle Limit
When DCL pin is shorted to R SET pin and switching fre-
quency is less than 250kHz (R FREQ > 80k), the maximum
duty cycle of LT3782 will be at least 90%. The maximum
duty cycle can be clamped to 50% by grounding the DCL
pin or to 75% by forcing the V DCL voltage to 1.2V with a
resistor divider from R SET pin to ground. The typical DCL
pin input current is 0.2μA.
Layout Considerations
To prevent EMI, the power MOSFETs and input bypass
capacitor leads should be kept as short as possible. A
ground plane should be used under the switching circuitry
to prevent interplane coupling and to act as a thermal
spreading path. Note that the bottom pad of the package
is the heat sink, as well as the IC signal ground, and must
be soldered to the ground plane.
In a boost converter, the conversion gain (assuming 100%
ef?ciency) is calculated as (ignoring the forward voltage
drop of the boost diode):
Slope Compensation
V OUT
V IN
=
1
1 ? D
The LT3782 is designed for high voltage and/or high
current applications, and very often these applications
generate noise spikes that can be picked up by the cur-
where D is the duty ratio of the main switch. D can then
be estimated from the input and output voltages:
; D MAX = 1 ? IN(MIN)
rentsensingampli?erandcauseswitchingjitter.Toavoid
switching jitter, careful layout is absolutely necessary to
minimize the current sensing noise pickup. Sometimes
D = 1 ?
V IN
V OUT
V
V OUT
increasing slope compensation to overcome the noise
can help to reduce jitter. The built-in slope compensa-
tion can be increased by adding a resistor R SLOPE from
SLOPE pin to ground. Note that smaller R SLOPE increases
slope compensation and the minimum R SLOPE allowed is
R FREQ /2.
DELAY
LT3782
R SET
R FREQ1
3782 F03
47.5k
R FREQ2
32.5k
Figure 3. Increase Delay Time
3782fg
10
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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 |
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