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参数资料
| 型号： | LTC3873ITS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK TSOT23-8 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 84% |
| 电源电压： | 4 V ~ 75 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
LTC3873-5
APPLICATIONS INFORMATION
Input Capacitors
The input capacitor of a boost converter is less critical due
the maximum step-up ratio or maximum output voltage
with the given input voltage of:
to the fact that the input current waveform is triangular, and
does not contain large square wave currents as found in
the output capacitor. The input voltage source impedance
V OUT ( MAX ) =
V IN ( MIN )
1 – 0 . 8 %
– V D
determines the size of the capacitor that is typically 10μF to
100μF. A low ESR is recommended although not as critical
as the output capacitor can be on the order of 0.3 Ω .
The RMS input ripple current for a boost converter is:
Current and voltage stress on the power switch and
synchronous recti?ers, input and output capacitor RMS
currents and transformer utilization (size vs power) are
impacted by duty factor. Unfortunately duty factor can-
I RMS ( CIN ) = 0 . 3 ?
V IN ( MIN )
L ? f
? D MAX
not be adjusted to simultaneously optimize all of these
requirements. In general, avoid extreme duty factors since
this severely impacts the current stress on most of the
components. A reasonable target for duty factor is 50% at
Please note that the input capacitor can see a very high
surge current when a battery is suddenly connected to the
nominal input voltage. Using this rule of thumb, the ideal
transformer turns ratio is:
V OUT 1 – D
V IN
= OUT
input of the converter and solid tantalum capacitors can
fail catastrophically under these conditions.
In a ?yback converter, the input ?ows in pulses placing
N IDEAL =
?
D
V
V IN
severe demands on the input capacitors. Select an input
capacitor with a ripple current rating greater than:
Output Diode Selection
I RMS =
P IN
V IN ( MIN )
1 – D MAX
D MAX
To maximize ef?ciency, a fast switching diode with low
forward drop and low reverse leakage is desired. The output
diode in a boost converter conducts current during the
switch off-time. The peak reverse voltage that the diode
Duty Cycle Considerations
The LTC3873-5 imposes a maximum duty cycle limit of
80% typical. For a ?yback converter, the maximum duty
cycle prevents the transformer core from saturation. In
must withstand is equal to the regulator output voltage.
The average forward current in normal operation is equal
to the output current, and the peak current is equal to the
peak inductor current.
a boost converter application, however, it sets a limit on
38735fb
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