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参数资料
| 型号： | LT3511MPMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISO ADJ .24A 16MSOP |
| 标准包装： | 2,500 |
| 类型： | 回扫，隔离 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 150V |
| 输入电压： | 4.5 V ~ 100 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 40kHz ~ 650kHz |
| 电流 - 输出： | 240mA |
| 同步整流器： | 无 |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm），12 引线 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP |
LT3511
APPLICATIONS INFORMATION
Minimum Load Requirement
LT3511
V IN
6V TO 100V
The LT3511 recovers output voltage information using the
flyback pulse. The flyback pulse occurs once the switch
turns off and the secondary winding conducts current. In
order to regulate the output voltage, the LT3511 needs to
sample the flyback pulse. The LT3511 delivers a minimum
amount of energy even during light load conditions to
LDO
BIAS
3V
ensure accurate output voltage information. The minimum
delivery of energy creates a minimum load requirement
of 10mA to 15mA depending on the specific application.
Verify minimum load requirements for each application.
A Zener diode with a Zener breakdown of 20% higher
than the output voltage can serve as a minimum load if
LT3511
V IN
LDO
BIAS
4.5V TO 15V
OPTIONAL
pre-loading is not acceptable. For a 5V output, use a 6V
Zener with cathode connected to the output.
LT3511
V IN
6V TO 100V
BIAS Pin Considerations
The BIAS pin powers the internal circuitry of the LT3511.
LDO
Three unique configurations exist for regulation of the BIAS
pin. In the first configuration, the internal LDO drives the
BIAS
3.3V < BIAS < 20V
EXTERNAL
SUPPLY
BIAS pin internally from the V IN supply. In the second setup,
the V IN supply directly drives the BIAS pin through a direct
connection bypassing the internal LDO. This configuration
will allow the part to operate down to 4.5V and up to 15V.
In the third configuration, an external supply or third wind-
ing drives the BIAS pin. Use this option when a voltage
supply exists lower than the input supply. Drive the BIAS
pin with a voltage supply higher than 3.3V to disable the
internal LDO. The lower voltage supply provides a more
efficient source of power for internal circuitry.
Overdriving the BIAS Pin with a Third Winding
The LT3511 provides excellent output voltage regulation
without the need for an opto-coupler, or third winding, but
for some applications with higher input voltages (>20V),
an additional winding (often called a third winding) im-
proves overall system efficiency. Design the third winding
to output a voltage between 3.3V and 12V. For a typical
48V IN application, overdriving the BIAS pin improves ef-
ficiency 4% to 5%.
3511 F08
Figure 8. BIAS Pin Configurations
Loop Compensation
An external resistor-capacitor network compensates the
LT3511 on the VC pin. Typical compensation values are in
the range of R C = 20k and C C = 2.2nF (see the numerous
schematics in the Typical Applications section for other pos-
sible values). Proper choice of both R C and C C is important
to achieve stability and acceptable transient response. For
example, vulnerability to high frequency noise and jitter
result when R C is too large. On the other hand, if R C is
too small, transient performance suffers. The inverse is
true with respect to the value of C C . Transient response
suffers with too large of a C C , and instability results from
too small a C C . The specific value for R C and C C will vary
based on the application and transformer choice. Verify
specific choices with board level evaluation and transient
response performance.
3511fc
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3512 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
| LT3512_11 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
| LT3512EMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3512EMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 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 |
| LT3512EMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
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