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参数资料
| 型号： | LT1766EFE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.5A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
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LT1766/LT1766-5
APPLICATIONS INFORMATION
LT1766
TO FREQUENCY
SHIFTING
V SW
L1
OUTPUT
5V
ERROR
1.4V
Q1
AMPLIFIER
+
1.2V
R1
–
R3
1k
R4
2k
FB
+
C1
BUFFER
Q2
TO SYNC CIRCUIT
R2
5k
V C
GND
1766 F02
Figure 2. Frequency and Current Limit Foldback
divider impedance is not critical, caution should be used if
resistors are increased beyond the suggested values and
short-circuit conditions occur with high input voltage. High
frequency pickup will increase and the protection accorded
by frequency and current foldback will decrease.
40mV/DIV
V OUT AT I OUT = 1A
V OUT AT I OUT = 0.1A
CHOOSING THE INDUCTOR
For most applications, the output inductor will fall into
the range of 15μH to 100μH. Lower values are chosen to
0.5A/DIV
INDUCTOR CURRENT
AT I OUT = 1A
INDUCTOR CURRENT
AT I OUT = 0.1A
reduce physical size of the inductor. Higher values allow
more output current because they reduce peak current
V IN = 40V
V OUT = 5V
L = 47μH
2.5μs/DIV
1766 F03
seen by the LT1766 switch, which has a 1.5A limit. Higher
values also reduce output ripple voltage.
When choosing an inductor you will need to consider
output ripple voltage, maximum load current, peak induc-
tor current and fault current in the inductor. In addition,
other factors such as core and copper losses, allowable
component height, EMI, saturation and cost should also
be considered. The following procedure is suggested
as a way of handling these somewhat complicated and
con?icting requirements.
Output Ripple Voltage
Figure 3 shows a typical output ripple voltage wave-
C = 100μF, 10V, 0.1 Ω
Figure 3. LT1766 Ripple Voltage Waveform
inductor value to achieve a desirable output ripple volt-
age level. If output ripple voltage is of less importance,
the subsequent suggestions in Peak Inductor and Fault
Current and EMI will additionally help in the selection of
the inductor value.
Peak-to-peak output ripple voltage is the sum of a triwave
(created by peak-to-peak ripple current (I LP-P ) times ESR)
and a square wave (created by parasitic inductance (ESL)
and ripple current slew rate). Capacitive reactance is as-
sumed to be small compared to ESR or ESL.
form for the LT1766. Ripple voltage is determined by
ripple current (I LP-P ) through the inductor and the high
frequency impedance of the output capacitor. The fol-
V RIPPLE = ( I LP - P )( ESR ) + ( ESL )
dI
dt
lowing equations will help in choosing the required
1766fc
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1766EFEPBF | 制造商:Linear Technology 功能描述:Sw. Regulator Step-Dn 1.5A 200kHz TSSOP |
| LT1766EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766EFE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766EGN | 功能描述:IC REG BUCK ADJ 1.5A 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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