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| 型号： | MAX15004AAUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 4.5 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| 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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MAX15004A/B/MAX15005A/B
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
L ≤
D MAX = ?
? V IN ? MIN + V OUT + V D ? ( V DS + V CS ) ?
=
An additional small LC filter may be necessary to sup-
press the remaining low-energy high-frequency spikes.
The LC filter also helps attenuate the switching frequen-
cy ripple. Care must be taken to avoid any compensa-
tion problems due to the insertion of the additional LC
filter. Design the LC filter with a corner frequency at more
than a decade higher than the estimated closed-loop,
unity-gain bandwidth to minimize its effect on the phase
margin. Use 1μF to 10μF low-ESR ceramic capacitors
and calculate the inductance using following equation:
1
4 × 10 3 × fc 2 × C
where f C = estimated converter closed-loop unity-gain
frequency.
SEPIC Converter
The MAX15004A/B/MAX15005A/B can be configured
for SEPIC conversion when the output voltage must be
lower and higher than the input voltage when the input
voltage varies through the operating range. The duty-
cycle equation:
V O D
V IN 1 ? D
ripple current through all the components mentioned
above. Lower ripple current means lower peak and RMS
currents and lower losses. The higher inductance value
needed for a lower ripple current means a larger-sized
inductor, which is a more expensive solution. The induc-
tors L1 and L2 can be independent, however, winding
them on the same core reduces the ripple currents.
Calculate the maximum duty cycle using the following
equation and choose the RT and CT values accordingly
for a given switching frequency (see the Oscillator
Frequency/External Synchronization section).
? V OUT + V D ?
?
where V D is the forward voltage of the Schottky diode,
V CS (0.305V) is the current-sense threshold of the
MAX15004/MAX15005, and V DS is the voltage drop
across the switching MOSFET during the on-time.
Inductor Selection in SEPIC Converter
Use the following equations to calculate the inductance
values. Assume both L1 and L2 are equal and that the
inductor ripple current ( Δ I L ) is equal to 20% of the input
current at nominal input voltage to calculate the induc-
tance value.
L = L 1 = L 2 = ? IN ? MIN MAX
? 0 . 2 × I OUT ? MAX × D MAX
Δ I L = ?
indicates that the output voltage is lower than the input
for a duty cycle lower than 0.5 while V OUT is higher
than the input at a duty cycle higher than 0.5. The
inherent advantage of the SEPIC topology over the
boost converter is a complete isolation of the output
? V × D
? 2 × f OUT × Δ I L
? ( 1 ? D MAX ) × η
?
?
?
?
?
?
I LPK = ? OUT ? MAX MAX + I OUT ? MAX + Δ I L ?
from the source during a fault at the output. For the
MAX15004/MAX15005, the SEPIC converter output can
be fed back to V CC (Figure 6), so that the controller can
function even during cold-crank input voltage ( ≤ 2.5V).
Use a Schottky diode (D VIN ) in the V IN path to avoid
backfeeding the input source. A current-limiting resistor
(R VCC ) is also needed from the output to V CC depend-
ing upon the converter output voltage. The total V CC
current sink must be limited to 25mA. See the Selecting
V CC Resistor (R VCC ) section to calculate the optimum
value of the V CC resistor.
The SEPIC converter design includes sizing of induc-
tors, a MOSFET, series capacitance, and the rectifier
diode. The inductance is determined by the allowable
20
where f OUT is the converter switching frequency and η
is the targeted system efficiency. Use the coupled
inductors MSD-series from Coilcraft or PF0553-series
from Pulse Engineering, Inc. Make sure the inductor
saturating current rating (I SAT ) is 30% higher than the
peak inductor current calculated using the following
equation. Use the current-sense resistor calculated
based on the I LPK value from the equation below (see
the Current Limit section).
? I × D ?
? ( 1 ? D MAX ) × η ?
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15004BAUE/V+ | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15004BAUE/V+T | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15004BAUE+ | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15004BAUE+T | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15005AAUE/V+ | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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