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参数资料
| 型号： | LT3759HMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 12-MSOP |
| 标准包装： | 37 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 1.6 V ~ 42 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
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LT3759
APPLICATIONS INFORMATION
to choose a MOSFET whose BV DSS is higher than V OUT
by a safety margin (a 10V safety margin is usually
sufficient).
The power dissipated by the MOSFET in a boost
converter is:
P FET = I 2L(MAX) ? R DS(ON) ? D MAX
It is recommended that the peak repetitive reverse voltage
rating V RRM is higher than V OUT by a safety margin (a 10V
safety margin is usually sufficient).
The power dissipated by the diode is:
P D = I O(MAX) ? V D
+ V 2OUT ? I L(MAX) ? C RSS ?
f
1A
and the diode junction temperature is:
T J = T A ? P D ? R θ J A
I D(PEAK) = I L(PEAK) = ? 1 + ? ? I L(MAX)
The first term in the preceding equation represents the
conduction losses in the devices, and the second term, the
switching loss. C RSS is the reverse transfer capacitance,
which is usually specified in the MOSFET characteristics.
For maximum efficiency, R DS(ON) and C RSS should be
minimized. From a known power dissipated in the power
MOSFET, its junction temperature can be obtained using
the following equation:
T J = T A ? P F E T ? θ JA
= T A + P FET ? ( θ J C + θ CA )
T J must not exceed the MOSFET maximum junction
temperature rating. It is recommended to measure the
MOSFET temperature in steady state to ensure that absolute
maximum ratings are not exceeded.
Boost Converter: Output Diode Selection
To maximize efficiency, a fast switching diode with low
forward drop and low reverse leakage is desirable. The
peak reverse voltage that the diode must withstand is
equal to the regulator output voltage plus any additional
ringing across its anode-to-cathode during the on-time.
The average forward current in normal operation is equal
to the output current, and the peak current is equal to:
? χ ?
? 2 ?
The R θ JA to be used in this equation normally includes the
R θ JC for the device plus the thermal resistance from the
board to the ambient temperature in the enclosure. T J must
not exceed the diode maximum junction temperature rating.
Boost Converter: Output Capacitor Selection
Contributions of ESR (equivalent series resistance), ESL
(equivalent series inductance) and the bulk capacitance
must be considered when choosing the correct output
capacitors for a given output ripple voltage. The effect of
these three parameters (ESR, ESL and bulk C) on the output
voltage ripple waveform for a typical boost converter is
illustrated in Figure 5.
The choice of component(s) begins with the maximum
t ON t OFF
? V COUT
V OUT
(AC)
RINGING DUE TO
TOTAL INDUCTANCE
? V ESR (BOARD + CAP)
3759 F05
Figure 5. The Output Ripple Waveform of a Boost Converter
acceptable ripple voltage (expressed as a percentage of
the output voltage), and how this ripple should be divided
between the ESR step ΔV ESR and charging/discharging
ΔV COUT . For the purpose of simplicity, we will choose
2% for the maximum output ripple, to be divided equally
between ΔV ESR and ΔV COUT . This percentage ripple will
3759fc
For more information www.linear.com/3759
15
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相关代理商/技术参数 |
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| LT3759IMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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) |
| LT3759IMSE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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) |
| LT375B | 制造商:EDSYN 功能描述:TIP SPADE 1.5X12.2MM |
| LT375-C | 制造商:EDSYN 功能描述: |
| LT376 | 制造商:EDSYN 功能描述: 制造商:EDSYN 功能描述:SOLDERING TIP, Tip / Nozzle Length:0.48" |
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