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| 型号： | LT3511HMS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.43 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封装： | LEAD FREE, PLASTIC, MSOP-12/16 |
| 文件页数： | 7/26页 |
| 文件大小： | 298K |
| 代理商： | LT3511HMS#TRPBF |
LT3511
15
3511fb
Minimum Load Requirement
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
ensureaccurateoutputvoltageinformation.Theminimum
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
pre-loading is not acceptable. For a 5V output, use a 6V
Zener with cathode connected to the output.
BIAS Pin Considerations
The BIAS pin powers the internal circuitry of the LT3511.
ThreeuniqueconfigurationsexistforregulationoftheBIAS
pin. In the first configuration, the internal LDO drives the
BIASpininternallyfromtheVINsupply.Inthesecondsetup,
the VIN supply directly drives the BIAS pin through a direct
connectionbypassingtheinternalLDO.Thisconfiguration
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
48VIN application, overdriving the BIAS pin improves ef-
ficiency 4% to 5%.
LT3511
3.3V < BIAS < 20V
6V TO 100V
BIAS
VIN
3511 F08
EXTERNAL
SUPPLY
LDO
LT3511
3V
6V TO 100V
BIAS
VIN
LDO
LT3511
4.5V TO 15V
BIAS
VIN
OPTIONAL
LDO
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 RC = 20k and CC = 2.2nF (see the numerous
schematicsintheTypicalApplicationssectionforotherpos-
sible values). Proper choice of both RCandCCisimportant
to achieve stability and acceptable transient response. For
example, vulnerability to high frequency noise and jitter
result when RC is too large. On the other hand, if RC is
too small, transient performance suffers. The inverse is
true with respect to the value of CC. Transient response
suffers with too large of a CC, and instability results from
too small a CC. The specific value for RC and CC will vary
based on the application and transformer choice. Verify
specific choices with board level evaluation and transient
response performance.
applicaTions inForMaTion
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3511IMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .24A 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 |
| LT3511IMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .24A 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 |
| LT3511MPMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .24A 16MSOP RoHS:是 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 |
| LT3511MPMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .24A 16MSOP RoHS:是 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 |
| LT3512 | 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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