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参数资料
| 型号： | LT3825EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 88% |
| 电源电压： | 11 V ~ 18 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LT3825
APPLICATIONS INFORMATION
I RMS =
I RMS =
= 1.17A
I RMS = I OUT
I RMS = 8A
= 8.43A
CapacitorSelection
In a flyback converter, the input and output current flows
in pulses, placing severe demands on the input and output
filter capacitors. The input and output filter capacitors are
selected based on RMS current ratings and ripple voltage.
Select an input capacitor with a ripple current rating
greater than:
P IN 1 – DC MAX
V IN(MIN) DC MAX
Continuing the example:
44.4W 1 – 52.6%
36V 52.6%
Keep input capacitor series resistance (ESR) and induc-
tance (ESL) small, as they affect electromagnetic interfer-
ence suppression. In some instances, high ESR can also
produce stability problems because flyback converters
exhibit a negative input resistance characteristic. Refer
to Application Note 19 for more information.
The output capacitor is sized to handle the ripple cur-
rent and to ensure acceptable output voltage ripple.
The output capacitor should have an RMS current
rating greater than:
DC MAX
1 – DC MAX
Continuing the example:
52.6%
1 – 52.6%
This is calculated for each output in a multiple winding
application.
ESR and ESL along with bulk capacitance directly affect
the output voltage ripple. The waveforms for a typical
flyback converter are illustrated in Figure 7.
The maximum acceptable ripple voltage (expressed as a
percentage of the output voltage) is used to establish a
starting point for the capacitor values. For the purpose
of simplicity we will choose 2% for the maximum output
ripple, divided equally between the ESR step and the
charging/discharging ? V. This percentage ripple changes,
depending on the requirements of the application. You can
modify the equations below.
For a 1% contribution to the total ripple voltage, the ESR
of the output capacitor is determined by:
ESR COUT ≤ 1% ?
V OUT ? ( 1– DC MAX )
I OUT
PRIMARY
CURRENT
SECONDARY
CURRENT
I PRI
I PRI
N
? V COUT
RINGING
DUE TO ESL
OUTPUT VOLTAGE
RIPPLE WAVEFORM
? V ESR
3825 F07
Figure 7. Typical Flyback Converter Waveforms
3525fe
24
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| LT3837EFE#PBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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