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| 型号： | LT3512MPMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26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
f SW =
=
t ON + t OFF L PRI ? I PEAK L PRI ? I PEAK
N PS ? ( V OUT + V F )
V IN
I PEAK =
D = ( 15 + 0.5 ) ? 2 = 0.39
I PEAK =
= 0.39A
I PEAK = OUT OUT
I PEAK =
= 0.44A
I RMS = I PEAK(VIN(MIN)) ? N PS ?
I RMS = 0.44 ? 2 ?
= 0.37A
V REVERSE = V OUT +
V REVERSE = 15V +
= 51V
I OUT ? D
? V OUT ? f SW
C =
= 6.5μF
Inaddition,primaryinductancewilldetermineswitching
frequency.
1 1
+
V OUT ? I OUT ? 2
η ? V IN ? D
Example:
Let’s calculate switching frequency at our nominal V IN
of 48V.
( 15 + 0.5 ) ? 2 + 48
15V ? 0.2A ? 2
0.83 ? 48V ? 0.39
Let’s choose L PRI = 200μH. Remember, most transform-
ers specify primary inductance with a tolerance of ±20%.
f SW = 240kHz
Finally, the transformer needs to be rated for the correct
saturation current level across line and load conditions.
In the given example, the worst-case condition for switch
current is at minimum V IN and maximum load.
V ? I ? 2
η ? V IN ? D
15V ? 0.2A ? 2
0.83 ? 36V ? 0.46
Ensure that the saturation current covers steady-state
operation, start-up and transient conditions. To satisfy
these conditions, choose a saturation current 50% or more
higher than the steady-state calculation. In this example, a
saturation current between 700mA and 800mA is chosen.
Table 1 presents a list of pre-designed flyback transformers.
For this application, the Sumida 10396-T023 transformer
will be used.
Step 4: Choose the correct output diode.
The two main criteria for choosing the output diode include
forward current rating and reverse voltage rating. The
maximum load requirement is a good first-order guess
at the average current requirement for the output diode.
A better metric is RMS current.
1– D VIN(MIN)
3
Example:
1– 0.46
3
Next calculate reverse voltage requirement using maxi-
mum V IN :
V IN(MAX)
N PS
Example:
72V
2
A 1.0A, 60V diode from Diodes Inc. (DFLS160) will be used.
Step 5: Choose an output capacitor.
The output capacitor choice should minimize output voltage
ripple and balance the trade-off between size and cost for
a larger capacitor. Use the equation below at nominal V IN :
C =
Example:
Design for ripple levels below 50mV.
0.2A ? 0.39
0.05V ? 240kHz
A 22μF, 25V output capacitor is chosen. Remember ce-
ramic capacitors lose capacitance with applied voltage.
The capacitance can drop to 40% of quoted capacitance
at the max voltage rating.
3512fb
17
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