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| 型号： | 750106 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 9/24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
ERROR AMPLIFIER—DYNAMIC THEORY
Due to the sampling nature of the feedback loop, there
are several timing signals and other constraints that are
Selecting R FB and R REF Resistor Values
The expression for V OUT, developed in the Operation section,
can be rearranged to yield the following expression for R FB :
R REF PS ?? ( V OUT + V F ) α + V TC ??
required for proper LT3575 operation.
Minimum Current Limit
R FB =
? N
V BG
The LT3575 obtains output voltage information from the
SW pin when the secondary winding conducts current.
The sampling circuitry needs a minimum amount of time
to sample the output voltage. To guarantee enough time,
a minimum inductance value must be maintained. The
primary side magnetizing inductance must be chosen
above the following value:
where,
V OUT = Output voltage
V F = Switching diode forward voltage
α = Ratio of Q1, IC to IE, typically 0.986
N PS = Effective primary-to-secondary turns ratio
? N PS = V OUT ? N PS ? ?
?
?
?
L PRI ≥ V OUT ?
t MIN
I MIN
? 0 . 88μH ?
V
V TC = 0.55V
The equation assumes the temperature coef?cients of
t MIN = minimum off-time, 350ns
I MIN = minimum current limit, 400mA
The minimum current limit is higher than that on the Elec-
trical Characteristics table due to the overshoot caused by
the comparator delay.
Leakage Inductance Blanking
When the output switch ?rst turns off, the ?yback pulse
appears. However, it takes a ?nite time until the transformer
primary side voltage waveform approximately represents
the output voltage. This is partly due to the rise time on
the SW node, but more importantly due to the trans-
former leakage inductance. The latter causes a very fast
voltage spike on the primary side of the transformer that
is not directly related to output voltage (some time is also
required for internal settling of the feedback ampli?er
circuitry). The leakage inductance spike is largest when
the power switch current is highest.
In order to maintain immunity to these phenomena, a ?xed
delay is introduced between the switch turn-off command
and the beginning of the sampling. The blanking is internally
set to 150ns. In certain cases, the leakage inductance may
not be settled by the end of the blanking period, but will
not signi?cantly affect output regulation.
the diode and V TC are equal, which is a good ?rst-order
approximation.
Strictly speaking, the above equation de?nes R FB not as
an absolute value, but as a ratio of R REF . So, the next
question is, “What is the proper value for R REF ?” The
answer is that R REF should be approximately 6.04k. The
LT3575 is trimmed and speci?ed using this value of R REF .
If the impedance of R REF varies considerably from 6.04k,
additional errors will result. However, a variation in R REF of
several percent is acceptable. This yields a bit of freedom
in selecting standard 1% resistor values to yield nominal
R FB /R REF ratios. The R FB resistor given by this equation
should also be veri?ed experimentally, and adjusted if
necessary for best output accuracy.
Tables 1-4 are useful for selecting the resistor values for
R REF and R FB with no equations. The tables provide R FB ,
R REF and R TC values for common output voltages and
common winding ratios.
Table 1. Common Resistor Values for 1:1 Transformers
V OUT (V) N PS R FB (kΩ) R REF (kΩ) R TC (kΩ)
3.3 1.00 18.7 6.04 19.1
5 1.00 27.4 6.04 28
12 1.00 64.9 6.04 66.5
15 1.00 80.6 6.04 80.6
20 1.00 107 6.04 105
3575f
9
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| 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 |
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| 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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