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参数资料
| 型号： | LTC3873ETS8#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK TSOT23-8 |
| 标准包装： | 500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 84% |
| 电源电压： | 8.8 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 ~ 85°C |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
LTC3873
APPLICATIONS INFORMATION
In a ?yback converter, the input ?ows in pulses placing
severe demands on the input capacitors. Select an input
capacitor with a ripple current rating greater than:
impacted by duty factor. Unfortunately duty factor can-
not be adjusted to simultaneously optimize all of these
requirements. In general, avoid extreme duty factors since
I RMS =
P IN
V IN ( MIN )
1 – D MAX
D MAX
this severely impacts the current stress on most of the
components. A reasonable target for duty factor is 50% at
nominal input voltage. Using this rule of thumb, the ideal
transformer turns ratio is:
V OUT 1 – D
V IN
= OUT
Duty Cycle Considerations
The LTC3873 imposes a maximum duty cycle limit of
80% typical. For a ?yback converter, the maximum duty
N IDEAL =
?
D
V
V IN
cycle prevents the transformer core from saturation. In
a boost converter application, however, it sets a limit on
the maximum step-up ratio or maximum output voltage
with the given input voltage of:
Output Diode Selection
To maximize ef?ciency, a fast switching diode with low
forward drop and low reverse leakage is desired. The output
V OUT ( MAX ) =
V IN ( MIN )
1 – 0 . 8
– V D
diode in a boost converter conducts current during the
switch off-time. The peak reverse voltage that the diode
must withstand is equal to the regulator output voltage.
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
The average forward current in normal operation is equal
to the output current, and the peak current is equal to the
peak inductor current.
V IN
36V TO 72V
4.7μF
100V
T1
?
D2
100μF
6.3V
V OUT *
3.3V
3A
221k
?
UPS840
3
2.2nF
15k
I TH
NGATE
LTC3873
Q1
FAN2512
51Ω
?
D1
0.1μF
GND
RUN/SS
V CC
IPRG
BAS516
0.1μF
12.06k
V FB = 1.2V SW
R FB *
3873 F07
21.5k
V OUT
4.7μF
10V
68mΩ
*FOR 5V OUTPUT CHANGE R FB TO 42.2k
Figure 7. 3.3V Output Nonisolated Telecom DC/DC Converter
3873fa
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3873IDDB-5#PBF | 制造商:Linear Technology 功能描述:DP-SWREG/Isolated, Cut Tape No Rsense Constant Frequency Current Mode Boost/Flyb |
| LTC3873IDDB-5#TRMPBF | 功能描述:IC REG CTRLR BST FLYBK PWM 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3873IDDB-5#TRPBF | 功能描述:IC REG CTRLR BST FLYBK PWM 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3873ITS8-5#PBF | 制造商:Linear Technology 功能描述:DP-SWREG/Isolated, Cut Tape No Rsense Constant Frequency Current Mode Boost/Flyb |
| LTC3873ITS8-5#TRMPBF | 功能描述:IC REG CTRLR BST FLYBK TSOT23-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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