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参数资料
| 型号： | LT1937ES5#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.32 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | PLASTIC, TSOT-23, 5 PIN |
| 文件页数： | 11/12页 |
| 文件大小： | 355K |
| 代理商： | LT1937ES5#PBF |
8
LT1937
1937f
APPLICATIO S I FOR ATIO
WU
UU
(11a) Recommended Soft-Startup Circuit
VIN = 3.6V
50
s/DIV
1937 F11b
THREE LEDs
15mA
FB
100mV/DIV
SHDN
2V/DIV
IIN
100mA/DIV
Figure 11. Recommended Soft-Startup Circuit and Waveforms
(11b) Soft-Startup Waveforms
Board Layout Consideration
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To maximize efficiency, switch rise and fall times are made
as short as possible. To prevent electromagnetic interfer-
ence (EMI) problems, proper layout of the high frequency
switching path is essential. The voltage signal of the SW
pin has sharp rise and fall edges. Minimize the length and
15
4
R1
2
3
R2
R3
DIMMING
CONTROL
CO
CIN
VIN
GND
SHDN
1937 F12a
D
L
Figure 12. Recommended Component Placement
area of all traces connected to the SW pin and always use
a ground plane under the switching regulator to minimize
interplane coupling. In addition, the ground connection for
the feedback resistor R1 should be tied directly to the GND
pin and not shared with any other component, ensuring a
clean, noise-free connection. Recommended component
placement is shown in Figure 12.
(SOT-23 Package)
16
5
4
R1
2
3
R2
R3
DIMMING
CONTROL
CO
CIN
VIN
GND
SHDN
1937 F12b
D
L
(SC70 Package)
R2
1k
R1
6.34
5k
D2: MMBT
2.2nF
D1
D2
COUT
1937 F11a
LT1937
FB
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| LT1937ES5#TR | 0.32 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO5 |
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相关代理商/技术参数 |
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| LT1937ESC6#TRM | 功能描述:IC LED DRVR WHITE BCKLGT SC-70-6 RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 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 |
| LT1937ESC6#TRMPBF | 功能描述:IC LED DRVR WHITE BCKLGT SC-70-6 RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 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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