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参数资料
| 型号： | LTC3806EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 12-DFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 290kHz |
| 占空比： | 94% |
| 电源电压： | 10 V ~ 75 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： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3806
APPLICATIO S I FOR ATIO
= I
D MAX
I RMS = 2 A
= 2 . 35 A RMS
0 . 01 ? V OUT ? ( 1 – D MAX )
C OUT ≥
characteristic. Refer to Application Note 19 for more
information.
The output capacitor is sized to handle the ripple current
and to insure acceptable output voltage ripple. The output
capacitor should have a ripple current rating greater than:
I RMS OUT
1– D MAX
This should be calculated for each output. For our ex-
ample, the OUT1 capacitor needs an RMS current rating
greater than:
0 . 579
1 – 0 . 579
The OUT2 capacitor RMS current rating is calculated in a
similar manner. The capacitor rating should be greater
than 586mA RMS . One final note, most capacitor manufac-
turers base their ripple current ratings on only 2000 hours
life. This makes it advisable to further derate the capacitor
or to choose a capacitor rated at a higher temperature than
required.
Contributions of ESR (equivalent series resistance), ESL
(equivalent series inductance) and the bulk capacitance
must be considered when choosing the correct compo-
nent for a given output ripple voltage. The effects of these
three parameters (ESR, ESL and bulk C) on the output
voltage ripple waveform are illustrated in Figure 5 for a
typical flyback converter.
The capacitance calculation begins with the maximum
acceptable ripple voltage (expressed as a percentage of
the output voltage), and how this ripple should be divided
between the ESR step and the charging/discharging Δ V.
For the purpose of simplicity we will choose 2% for the
maximum output ripple, to be divided equally between the
ESR step and the charging/discharging Δ V. This percent-
age ripple will change, depending on the requirements of
the application, and the equations provided below can
easily be modified.
For a 1% contribution to the total ripple voltage, the ESR
of the output capacitor can be determined using the
following equation:
ESR COUT ≤
I OUT
For the bulk C component, which also contributes 1% to
the total ripple:
I OUT
0 . 01 ? V OUT ? F
For many designs it is possible to choose a single capaci-
tor type that satisfies both the ESR and bulk C require-
ments for the design. In certain demanding applications,
however, the ripple voltage can be improved significantly
by connecting two or more types of capacitors in parallel.
For example, using a low ESR ceramic capacitor can
minimize the ESR step, while an electrolytic capacitor can
be used to supply the required bulk C.
PRIMARY
CURRENT
SECONDARY
CURRENT
I PRI
I PRI
N
Δ V COUT
OUTPUT VOLTAGE
RIPPLE WAVEFORM
Δ V ESR
RINGING
DUE TO ESL
3806 F05
Figure 5. Typical Flyback Converter Waveforms (Single Output)
3806fb
14
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相关代理商/技术参数 |
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| LTC3808EDE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 2.75V to 9.8V Input 14-Pin DFN EP |
| LTC3808EDE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-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) |
| LTC3808EDE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-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) |
| LTC3808EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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) |
| LTC3808EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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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