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参数资料
| 型号： | LT3511MPMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/26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
at maximum load and minimum input voltage. The switch
current is highest at this point along with the energy stored
in the leakage inductance. A 0.5W Zener will satisfy most
applications when the highest V ZENER is chosen. Choosing
a low value for V ZENER will cause excessive power loss as
shown in the following equations:
node and transformer leakage inductance cause the
delay. The leakage inductance also causes a very fast
voltage spike on the primary side of the transformer.
The amplitude of the leakage spike is largest when
power switch current is highest. Introduction of an
internal fixed delay between switch turn-off and the
? L ? I PK(VIN(MIN))2 ? f SW ?
N PS ? ( V OUT + V F )
?? 1 +
V ZENER – N PS ? ( V OUT + V F ) ? ?
DZ Power Loss =
1
2
? ?
?
?
start of sampling provides immunity to the phenomena
discussed above. The LT3511 sets internal blanking to
150ns. In certain cases leakage inductance spikes last
longer than the internal blanking, but will not signifi-
cantly affect output regulation.
I PK(VIN(MIN)) =
f SW =
=
+ PRI PK(VIN(MIN))
L = Leakage Inductance
V OUT ? I OUT ? 2
η ? V IN(MIN) ? D VIN(MIN)
1
t ON + t OFF L PRI ? I PK(VIN(MIN))
V IN(MIN)
1
L ?I
N PS ? ( V OUT + V F )
Secondary Leakage Inductance
In addition to primary leakage inductance, secondary
leakage inductance exhibits an important effect on ap-
plication design. Secondary leakage inductance forms
an inductive divider on the transformer secondary. The
inductive divider effectively reduces the size of the
primary-referred flyback pulse. The smaller flyback
Tables 2 and 3 show some recommended diodes and
Zener diodes.
Table 2. Recommended Zener Diodes
pulse results in a higher regulated output voltage. The
inductive divider effect of secondary leakage inductance
is load independent. R FB /R REF ratio adjustments can ac-
commodate this effect to the extent secondary leakage
PART
MMSZ5266BT1G
V ZENER
(V)
68
POWER
(W)
0.5
CASE
SOD-123
VENDOR
On Semi
inductance is a constant percentage of mutual inductance
(over manufacturing variations).
SOD-123
MMSZ5270BT1G
CMHZ5266B
CMHZ5267B
BZX84J-68
BZX100A
91
68
75
68
100
0.5
0.5
0.5
0.5
0.5
SOD-123
SOD-123 Central
Semiconductor
SOD323F NXP
SOD323F
Winding Resistance Effects
Resistance in either the primary or secondary will re-
duce overall efficiency (P OUT /P IN ). Good output voltage
regulation will be maintained independent of winding
resistance due to the boundary mode operation of the
Table 3. Recommended Diodes
LT3511.
PART
I (A)
V REVERSE
(V)
CASE
VENDOR
Bifilar Winding
BAV21W
BAV20W
0.625
0.625
200
150
SOD-123 Diodes Inc.
SOD-123
A bifilar, or similar winding technique, is a good way to
minimize troublesome leakage inductances. However, re-
Leakage Inductance Blanking
When the power switch turns off, the flyback pulse
appears. However, a finite time passes before the trans-
former primary-side voltage waveform approximately
represents the output voltage. Rise time on the SW
member that this will also increase primary-to-secondary
capacitance and limit the primary-to-secondary breakdown
voltage, so bifilar winding is not always practical. The
Linear Technology applications group is available and
extremely qualified to assist in the selection and/or design
of the transformer.
3511fc
13
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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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