- 您现在的位置：买卖IC网 > PDF目录13808 > LT3512MPMS#PBF (Linear Technology)IC REG FLYBK ISO ADJ .42A 16MSOP PDF资料下载
参数资料
| 型号： | LT3512MPMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/26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： | -55°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
( V OUT + V F + 0.55V ) ? N PS ? R REF
R FB =
R TC = FB
R FB = ( 15 + 0.5 + 0.55V ) ? 2 ? 10k = 267k
R TC =
= 133k
R FB(NEW) =
? R FB(OLD)
R FB(NEW) =
? 267k = 237k
? V OUT V OUT(HOT) – V OUT(COLD)
? Temp
T HOT( ° C) – T COLD( ° C)
Step6:Designclampcircuit.
The clamp circuit protects the switch from leakage induc-
tance spike. A DZ clamp is the preferred clamp circuit. The
Zener and the diode need to be chosen.
The maximum Zener value is set according to the maxi-
mum V IN :
V ZENER(MAX) ≤ 150V – V IN(MAX)
Example:
V ZENER(MAX) ≤ 150V – 72V
V ZENER(MAX) ≤ 78V
In addition, power loss in the clamp circuit is inversely
related to the clamp voltage as shown previously. Higher
clamp voltages lead to lower power loss.
A 68V Zener with a maximum of 72V will provide optimal
protection and minimize power loss. Half-watt Zeners will
satisfy most clamp applications involving the LT3512.
Power loss can be calculated using the equations presented
in the Leakage Inductance and Clamp Circuit section.
The Zener chosen is a 68V 0.5W Zener from On Semicon-
ductor (MMSZ5266BT1G).
Choose a diode that is fast and has sufficient reverse
voltage breakdown:
V REVERSE > V SW(MAX)
V SW(MAX) = V IN(MAX) + V ZENER(MAX)
Example:
V REVERSE > 140V
The diode needs to handle the peak switch current of the
switch which was determined to be 0.45A. A 200V, 1.0A
diode from Diodes Inc. (DFLS1200) is chosen.
Step 7: Compensation.
Compensation will be optimized towards the end of the
design procedure. Connect a resistor and capacitor from
the VC node to ground. Use a 15k resistor and a 4.7nF
capacitor.
Step 8: Select R FB and R TC Resistors.
Use the following equations to choose starting values for
R FB and R TC . Set R REF to 10k.
1.2V
R REF = 10k
R
N PS
Example:
1.2V
267k
2
Step 9: Adjust R FB based on output voltage.
Power up the application with application components
connected and measure the regulated output voltage.
Readjust R FB based on the measured output voltage.
V OUT
V OUT(MEAS)
Example:
15V
16.7V
Step 10: Remove R TC and measure output voltage
over temperature.
Measure output voltage in a controlled temperature envi-
ronment like an oven to determine the output temperature
coefficient. Measure output voltage at a consistent load
current and input voltage, across the temperature range
of operation. This procedure will optimize line and load
regulation over temperature.
Calculate the temperature coefficient of V OUT :
=
3512fb
18
相关PDF资料 |
PDF描述 |
|---|---|
| LT1074HVIT7 | IC REG MULTI CONFIG ADJ TO220-7 |
| V72B8C150B2 | CONVERTER MOD DC/DC 8V 150W |
| GMM28DSUH | CONN EDGECARD 56POS DIP .156 SLD |
| MAX6721AUTYVD3+T | IC SUPERVISOR MPU SOT23-6 |
| GMM28DSUN | CONN EDGECARD 56POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3513 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513EUHF#PBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513EUHF#TRPBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513EUHF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
发布紧急采购，3分钟左右您将得到回复。