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参数资料
| 型号： | 750106 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LT3575 |
| 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： | 10W |
| 输出电压： | 5V |
| 电流 - 输出： | 2A（最小值） |
| 输入电压： | 10 ~ 28 VDC |
| 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： | LT3575 |
| 相关产品： | LT3575IFE#TRPBF-ND - IC REG FLYBACK ISO ADJ 16TSSOP LT3575IFE#PBF-ND - IC REG FLYBACK ISO ADJ 16TSSOP LT3575EFE#TRPBF-ND - IC REG FLYBACK ISO ADJ 16TSSOP LT3575EFE#PBF-ND - IC REG FLYBACK ISO ADJ 16TSSOP |
| 其它名称： | 732-3306 |
LT3575
APPLICATIONS INFORMATION
The transformer turns ratio is selected such that the
converter has adequate current capability and a switch
Table 7.Switching Frequency at Different Primary
Inductance at I PK
stress below 50V. Table 6 shows the switch voltage stress
and output current capability at different transformer
turns ratio.
Table 6. Switch Voltage Stress and Output Current Capability vs
L (μH)
15
30
60
f SW AT V IN(MIN)
(kHz)
174
87
44
f SW AT V IN(MAX)
(kHz)
205
103
51
Turns-Ratio
Note: The switching frequency is calculated at maximum output.
V SW(MAX) AT V IN(MAX)
I OUT(MAX) AT V IN(MIN)
DUTY CYCLE
N
1:1
2:1
3:1
4:1
(V)
33.5
39
44.5
50
(A)
1.26
2.07
2.63
3.05
(%)
16~22
28~35
37~45
44~52
In this design example, the minimum primary inductance is
used to achieve a nominal switching frequency of 200kHz at
full load. The 750311458 from Würth Elektronik is chosen
as the ?yback transformer.
Given the turns ratio and primary inductance, a custom-
BIAS winding turns ratio is selected to program the BIAS
voltage to 3V~5V. The BIAS voltage shall not exceed the
input voltage.
The turns ratio is then selected as primary: secondary:
BIAS = 3:1:1.
2. Select the transformer primary inductance for target
switching frequency.
The LT3575 requires a minimum amount of time to sample
ized transformer can be designed by magnetic component
manufacturer or a multi-winding transformer such as a
Coiltronics Versa-Pac may be used.
3. Select the output diodes and output capacitor.
The output diode voltage stress V D is the summation of
the output voltage and re?ection of input voltage to the
secondary side. The average diode current is the load
current.
the output voltage during the off-time. This off-time,
t OFF(MIN) , shall be greater than 350ns over all operating
V D = V OUT +
V IN
N
L MIN =
Δ V MAX
LI 2 PK
conditions.Theconverteralsohasaminimumcurrentlimit,
I MIN , of 400mA to help create this off-time. This de?nes
the minimum required inductance as de?ned as:
N( V OUT + V F )
? t OFF ( MIN )
I MIN
The transformer primary inductance also affects the
switching frequency which is related to the output ripple. If
above the minimum inductance, the transformer’s primary
inductance may be selected for a target switching frequency
range in order to minimize the output ripple.
The following equation estimates the switching frequency.
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.
=
2 CV OUT
4. Select the snubber circuit to clamp the switch
voltage spike.
A ?yback converter generates a voltage spike during switch
turn-off due to the leakage inductance of the transformer.
=
+
f SW =
1 1
t ON + t OFF I PK I PK
L
V IN N PS ( V OUT + V F )
L
In order to clamp the voltage spike below the maximum
rating of the switch, a snubber circuit is used. There are
many types of snubber circuits, for example R-C, R-C-D and
3575f
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 750-106 | 制造商:GLENAIR 制造商全称:Glenair, Inc. 功能描述:Pre-Terminated Assemblies |
| 750107 | 功能描述:BOARD EVAL FOR LT3748 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| 7501078 | 制造商:ARK-LES CONNECTORS 功能描述:.240 SQUARED RING TERMINAL 16-14 AWG 6 STUD SIZE |
| 750108 | 功能描述:BOARD EVAL FOR LT3748 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| 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 |
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