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| 型号： | LT3512EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISO ADJ .42A 16MSOP |
| 标准包装： | 37 |
| 类型： | 回扫，隔离 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 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： | 420mA |
| 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-TFSOP（0.118"，3.00mm），12 引线 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP |
LT3512
APPLICATIONS INFORMATION
order to regulate the output voltage, the LT3512 needs to
sample the flyback pulse. The LT3512 delivers a minimum
amount of energy even during light load conditions to
ensure accurate output voltage information. The minimum
delivery of energy creates a minimum load requirement
of 20mA to 25mA 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.
LT3512
LT3512
V IN
LDO
BIAS
V IN
LDO
6V TO 100V
3V
4.5V TO 15V
V IN
EXTERNAL
BIAS
BIASPinConsiderations
The BIAS pin powers the internal circuitry of the LT3512.
Three unique configurations exist for regulation of the BIAS
pin. In the first configuration, the internal LDO drives the
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 LT3512 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)
improves overall system efficiency. Design the third wind-
ing to output a voltage between 3.3V and 12V. For a typi-
cal 48V IN application, overdriving the BIAS pin improves
efficiency 4% to 5%.
Loop Compensation
An external resistor-capacitor network compensates the
LT3512 on the VC pin. Typical compensation values are in
the range of R C = 15k and C C = 4.7nF (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
BIAS
OPTIONAL
LT3512 6V TO 100V
LDO
3.3V < BIAS < 20V
SUPPLY
3512 F08
Figure 8. BIAS Pin Configurations
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.
DESIGN PROCEDURE/DESIGN EXAMPLE
Use the following design procedure as a guide to design-
ing applications for the LT3512. Remember, the unique
sampling architecture requires an iterative process for
choosing correct resistor values.
The design example involves designing a 15V output with
a 200mA load current and an input range from 36V to 72V.
V IN(MIN) = 36V, V IN(NOM) = 48V, V IN(MAX) = 72V, V OUT =
15V and I OUT = 200mA
3512fb
15
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| LT3512HMS#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:- 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 |
| LT3512HMS#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:- 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 |
| LT3512HMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
| LT3512IMS#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: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 |
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