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| 型号： | 750108 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 22/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LT3748 |
| 设计资源： | LT3748 Design Schematic/Tips |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 30W |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 22 ~ 75 V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LT3748 |
| 相关产品： | LT3748HMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748HMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP |
| 其它名称： | 732-3308 |
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LT3748
APPLICATIONS INFORMATION
6. Select the Feedback Resistor for Proper Output
Voltage
Using the iterative process laid out earlier in the Applications
Information section, select the feedback resistor R FB and
program the output voltage to 5V. Adjust the R TC resistor
for temperature compensation of the output voltage. R REF
is selected as 6.04k.
7. Select the Output Capacitor
The output capacitor should be chosen to minimize the
output voltage ripple while considering the increase in
size and cost of a larger capacitor. The following equation
calculates the output voltage ripple:
clamp was considered in order to maximize efficiency but
was unable to turn on fast enough to sufficiently clamp the
very fast leakage spike. The final solution is an RC snubber,
implemented iteratively, that decreases efficiency by less
than 1% across the majority of the output load range while
reducing the worst-case drain voltage spike to just 80V.
Similarly, the anode of the output diode is probed to look
at potential ringing when the MOSFET switch turns on and
a peak of 45V is measured across the diode. Therefore,
no snubber circuitry is required.
9. Optimize the Compensation Network
To set the compensation, the application is first configured
with a 22nF capacitor and 10k resistor as a starting point. A
Δ V MAX =
L PRI ? I LIM2
2 ? C OUT ? V OUT
load step is applied at both light and heavy loads at the 60V
maximum input voltage and the capacitance is decreased
until damping decreases to the desired limit, in this case
8. Add Snubber Circuitry as Necessary
With the primary components selected, the application
should be constructed to evaluate ringing at the drain of the
MOSFET switch and to evaluate step response to optimize
the compensation network. If using an RC snubber, the
equations from the Applications Information section can
be used or a rough estimate of component values may
come from using the published leakage inductance of the
transformer and selecting a snubber capacitor ranging
from 1 to 3 times larger than the published MOSFET output
capacitance. In this application, the peak MOSFET drain
voltage was measured at maximum load from minimum
V IN and exceeded the 150V rating of the Si7738. A DZ
with a compensation capacitance of 2.2nF and a response
implying about 60? of phase margin. After verifying stability
at the minimum input voltage, as well, the compensation
capacitance is doubled for safety margin. The series resis-
tance is varied from 5k to 50k but the optimal response is
observed with 24.7k. For best ripple performance, select
a compensation capacitor not less than 1nF, and select a
compensation resistor not greater than 50k.
10. Soft-Start Capacitor and UVLO Resistor Divider
A soft-start capacitor helps during the start-up of the
flyback converter. Select the UVLO resistor divider for
the intended input operation range. These equations are
aforementioned.
3748fa
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 750109 | 制造商:Pilz International 功能描述:CONTACT MODULE 3NO/1NC 24V 制造商:PILZ 功能描述:CONTACT MODULE, 3NO/1NC, 24V, 30OHM 制造商:PILZ 功能描述:CONTACT MODULE, 3NO/1NC, 24V, 30OHM; Coil Voltage VDC Nom:24V; Contact Current Max:6A; Contact Voltage AC Nom:240V; Contact Voltage DC Max:24V; Coil Resistance:30ohm; Contact Configuration:3PST-NO, SPST-NC; Average Power ;RoHS Compliant: Yes |
| 750-109 | 功能描述:安装硬件 CIRC-O-GIDE .75in Nylon Black 94V-0 RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小: |
| 75010BK002 | 制造商:Alpha Wire Company 功能描述:Cat5e cable 2 pair solid 105deg 152m |
| 75010-BK002 | 制造商:Alpha Wire 功能描述: |
| 75-010BP | 制造商:RAYHOME 功能描述:ST/STEEL SHIM 0.10X75X75 |
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