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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： | 6/20页 |
| 文件大小： | 247K |
| 代理商： | LT1765 |
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
6
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PIU
V
SW
:
The switch pin is the emitter of the on-chip power
NPN switch. This pin is driven up to the input pin voltage
during switch on time. Inductor current drives the switch
pin negative during switch off time. Negative voltage must
be clamped with an external catch diode with a V
BR
<0.8V.
Both V
SW
pins of the TSSOP package must be shorted
together on the PC board.
SYNC:
The sync pin is used to synchronize the internal
oscillator to an external signal. It is directly logic compat-
ible and can be driven with any signal between 20% and
80% duty cycle. The synchronizing range is from 1.6MHz
to 2MHz. See Synchronization section in Applications
Information for details. When not in use, this pin should be
grounded.
SHDN:
The shutdown pin is used to turn off the regulator
and to reduce input drain current to a few microamperes.
The 1.33V threshold can function as an accurate under-
voltage lockout (UVLO), preventing the regulator from
operating until the input voltage has reached a predeter-
mined level. Float or pull high to put the regulator in the
operating mode.
V
C
:
The V
C
pin is the output of the error amplifier and the
input of the peak switch current comparator. It is normally
used for frequency compensation, but can do double duty
as a current clamp or control loop override. This pin sits
at about 0.4V for very light loads and 0.9V at maximum
load. It can be driven to ground to shut off the output.
FB:
The feedback pin is used to set output voltage using
an external voltage divider (adjustable version) that gen-
erates 1.2V at the pin when connected to the desired
output voltage. The fixed voltage 1.8V, 2.5V, 3.3V and 5V
versions have the divider network included internally and
the FB pin is connected directly to the output. If required,
the current limit can be reduced during start up or short-
circuit when the FB pin is below 0.5V (see the Current Limit
Foldback graph in the Typical Performance Characteris-
tics section). An impedance of less than 5k
on the
adjustable version at the FB pin is needed for this feature
to operate.
BOOST:
The BOOST pin is used to provide a drive voltage,
higher than the input voltage, to the internal bipolar NPN
power switch.
V
IN
:
This is the collector of the on-chip power NPN switch.
This pin powers the internal circuitry and internal regula-
tor. At NPN switch on and off, high di/dt edges occur on
this pin. Keep the external bypass capacitor and catch
diode close to this pin. All trace inductance on this path will
create a voltage spike at switch off, adding to the V
CE
voltage across the internal NPN. Both V
IN
pins of the
TSSOP package must be shorted together on the PC
board.
GND:
The GND pin acts as the reference for the regulated
output, so load regulation will suffer if the “ground” end of
the load is not at the same voltage as the GND pin of the
IC. This condition will occur when load current or other
currents flow through metal paths between the GND pin
and the load ground point. Keep the ground path short
between the GND pin and the load and use a ground plane
when possible. Keep the path between the input bypass
and the GND pin short. The exposed GND pad and/or GND
pins of the package are directly attached to the internal tab.
These pins/pad should be attached to a large copper area
to reduce thermal resistance.
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 |
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