参数资料
| 型号： | LT1777IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 30 V |
| 输入电压： | 12 V ~ 48 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 700mA |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC |
LT1777
TYPICAL APPLICATIO N S
Basic 5V Output Application
Figure 8 shows a basic application that produces 5V at up
to 500mA I OUT . Efficiency and Internal Power Dissipation
graphs are shown in Figure 9 for input voltages of 12V,
24V and 36V, and for sense inductor values of 0 μ H, 1 μ H
and 2.2 μ H. Be aware that continuous operation at the
combination of high input voltage, large sense inductor
and high output current may not be possible due to
thermal constraints. (Brief transients in input voltage or
output current should not present a problem, though.) As
shown, the SHDN and SYNC pins are unused, however
either (or both) can be optionally driven by external signals
as desired.
The data as shown were performed using an off-the-shelf
Coilcraft DO3316-224 as the main inductor. This is a
cost-effective inductor using an open style of construc-
tion. For a toroidal style inductor, the Coiltronics
CTX250-4 or similar may be substituted.
V IN
10V TO 40V
+
C1
39 μ F
63V
C6
0.1 μ F
C4
100pF
C5
100pF
R3
12k
C3
3
12
14
10
V IN
SHDN V CC
LT1777
SYNC V SW
V C V D
SGND
FB
4
6
5
13
L1
0 μ H TO 2.2 μ H
(SEE BELOW)
L2
220 μ H
D1
+
C2
100 μ F
10V
C7
0.1 μ F
R1
36.5k
1%
V OUT
5V
2200pF
C1: PANASONIC HFQ ELECTROLYTIC
C2: AVX D CASE TPSD107M010R0080
C3, C4, C5: NPO OR X7R
C6, C7: Z5U
D1: MOTOROLA 100V, 1A SMD SCHOTTKY
7
L1: SENSE INDUCTOR CAN VARY FROM 0 μ H TO 2.2 μ H
AS PER APPLICATION. GRAPHICAL DATA TAKEN WITH:
1 μ H = D01608C-102, COILCRAFT OR SIMILAR
2.2 μ H = D01608C-222, COILCRAFT OR SIMILAR (SEE TEXT)
L2: COILCRAFT D03316-224 OR SIMILAR (SEE TEXT)
R2
12.1k
1%
1777 F08
MBRS1100
Figure 8. Basic 5V Output Application
17
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相关代理商/技术参数 |
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| LT1780CN | 功能描述:IC DVR/RCVR 5V RS232 DUAL 18-DIP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1780CN#PBF | 功能描述:IC DVR/RCVR 5V RS232 DUAL 18-DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| LT1780CSW | 功能描述:IC DVR/RCVR 5V RS232 DUAL 18SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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