- 您现在的位置：买卖IC网 > PDF目录377714 > LT1765 (Linear Technology Corporation) Isolated Flyback Switching Regulator with 9V Output PDF资料下载
参数资料
| 型号： | LT1765 |
| 厂商： | Linear Technology Corporation |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔离反激式开关稳压9V输出 |
| 文件页数： | 15/20页 |
| 文件大小： | 247K |
| 代理商： | LT1765 |
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
15
sn1765 1765fas
RiseTime
R
C
V
)
V
(
SS
OUT
BE
=
(
)(
)(
)
4
Using the values shown in Figure 10,
RiseTime
ms
5
=
=
(
)(
)( )
5
.
–
47 10
15 10
0 7
3
9
The ramp is linear and rise times in the order of 100ms are
possible. Since the circuit is voltage controlled, the ramp
rate is unaffected by load characteristics and maximum
output current is unchanged. Variants of this circuit can be
used for sequencing multiple regulator outputs.
APPLICATIOU
W
U
U
Dual Output Converter
The circuit in Figure 11 generates both positive and
negative 5V outputs with a single piece of magnetics. The
two inductors shown are actually just two windings on a
standard B H Electronics inductor. The topology for the 5V
output is a standard buck converter. The –5V topology
would be a simple flyback winding coupled to the buck
converter if C4 were not present. C4 creates a SEPIC
(single-ended primary inductance converter) topology
which improves regulation and reduces ripple current in
L1. Without C4, the voltage swing on L1B compared to
L1A would vary due to relative loading and coupling
losses. C4 provides a low impedance path to maintain an
equal voltage swing in L1B, improving regulation. In a
flyback converter, during switch on time, all the converter’s
energy is stored in L1A only, since no current flows in L1B.
At switch off, energy is transferred by magnetic coupling
into L1B, powering the –5V rail. C4 pulls L1B positive
during switch on time, causing current to flow, and energy
to build in L1B and C4. At switch off, the energy stored in
both L1B and C4 supply the –5V rail. This reduces the
current in L1A and changes L1B current waveform from
square to triangular. For details on this circuit, including
maximum output currents, see Design Note 100.
3.3V, 2A
* ONLY REQUIRED IF ADDITIONAL LOADS ON THE INPUT CAN SINK >10mA
REMOVABLE
INPUT
0.18
μ
F
2.2nF
83k
UPS120
1765 F09
2.2
μ
F
MBRS330T3*
CMDSH-3
5
μ
H
4.7
μ
F
BOOST
LT1765-3.3
V
IN
V
SW
FB
SHDN
SYNC
GND
V
C
ALTERNATE
SUPPLY
28.5k
Figure 9. Dual Source Supply with 6
μ
A Reverse Leakage
BOOST
LT1765-5
V
IN
OUTPUT
5V
1A
INPUT
12V
1765 F10
C2
0.18
μ
F
C1
100
μ
F
C
15nF
C
C
330pF
D1
C3
2.2
μ
F
D2
CMDSH-3
L1
5
μ
H
R3
2k
V
SW
FB
SHDN
SYNC
GND V
C
+
R4
47k
Q1
D1: UPS120
Q1: 2N3904
Figure 10. Buck Converter with Adjustable Soft Start
相关PDF资料 |
PDF描述 |
|---|---|
| LT1765-2.5 | Isolated Flyback Switching Regulator with 9V Output |
| LT1767-2.5 | Direct mounting on the PCB, Crimping connection, Discrete wire connectors; HRS No: 544-0063-6 00; No. of Positions: 15; Connector Type: Wire; Contact Gender: Male; Contact Spacing (mm): 2; Terminal Pitch (mm): 2; Termination Style: IDC; Current Rating(Amps)(Max.): 1; Contact Mating Area Plating: Tin; Operating Temperature Range (degrees C): -30 to 85; General Description: Housing; Straight; Direct PCB mounting; For AWG#26 |
| LT1767EMS8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1767EMS8-1.8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1767EMS8-2.5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1765-1.8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 3A, 1.25MHz Step-Down Switching Regulator |
| LT1765-2.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 3A, 1.25MHz Step-Down Switching Regulator |
| LT1765-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 3A, 1.25MHz Step-Down Switching Regulator |
| LT1765-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 3A, 1.25MHz Step-Down Switching Regulator |
| LT1765EFE | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
发布紧急采购，3分钟左右您将得到回复。