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参数资料
| 型号： | MAX15005BAUE |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| 中文描述： | 4.5V至40V输入汽车反激/升压/ SEPIC电源控制器 |
| 文件页数： | 17/29页 |
| 文件大小： | 547K |
| 代理商： | MAX15005BAUE |
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I
O
is the load current,
V
Q
is the portion of the ripple due
to the capacitor discharge, and
V
ESR
is the contribution
due to the ESR of the capacitor. D
MAX
is the maximum
duty cycle at the minimum input voltage. Use a combina-
tion of low-ESR ceramic and high-value, low-cost alu-
minum capacitors for lower output ripple and noise.
Calculating Power Loss in Boost Converter
The MAX15004A/MAX15005A devices are available in
a thermally enhanced package and can dissipate up to
1.7W at +70°C ambient temperature. The total power
dissipation in the package must be limited so that the
junction temperature does not exceed its absolute max-
imum rating of +150°C at maximum ambient tempera-
ture; however, Maxim recommends operating the
junction at about +125°C for better reliability.
The average supply current (I
DRIVE-GATE
) required by
the switch driver is:
where Q
g
is total gate charge at 7.4V, a number avail-
able from MOSFET datasheet.
The supply current in the MAX15004A/B/MAX15005A/B
is dependent on the switching frequency. See the
Typical Operating Characteristics to find the supply
current I
SUPPLY
of the MAX15004A/B/MAX15005A/B at
a given operating frequency. The total power dissipa-
tion (P
T
) in the device due to supply current (I
SUPPLY
)
and the current required to drive the switch (I
DRIVE-
GATE
) is calculated using following equation.
MOSFET Selection in Boost Converter
The MAX15004A/B/MAX15005A/B drive a wide variety of
n-channel power MOSFETs. Since V
CC
limits the OUT
output peak gate-drive voltage to no more than 11V, a
12V (max) gate voltage-rated MOSFET can be used with-
out an additional clamp. Best performance, especially at
low-input voltages (5V
IN
), is achieved with low-threshold
n-channel MOSFETs that specify on-resistance with a
gate-source voltage (V
GS
) of 2.5V or less. When selecting
the MOSFET, key parameters can include:
1) Total gate charge (Q
g
).
2) Reverse-transfer capacitance or charge (C
RSS
).
3) On-resistance (R
DS(ON)
).
4) Maximum drain-to-source voltage (V
DS(MAX)
).
5) Maximum gate frequencies threshold voltage
(V
TH(MAX)
).
At high switching, dynamic characteristics (parameters 1
and 2 of the above list) that predict switching losses
have more impact on efficiency than R
DS(ON)
, which pre-
dicts DC losses. Q
g
includes all capacitances associat-
ed with charging the gate. The V
DS(MAX)
of the selected
MOSFET must be greater than the maximum output volt-
age setting plus a diode drop. The 10V additional margin
is recommended for spikes at the MOSFET drain due to
the inductance in the rectifier diode and output capacitor
path. In addition, Q
g
helps predict the current needed to
drive the gate at the selected operating frequency when
the internal LDO is driving the MOSFET.
Slope Compensation in Boost Configuration
The MAX15004A/B/MAX15005A/B use an internal ramp
generator for slope compensation to stabilize the current
loop when operating at duty cycles above 50%. It is
advisable to add some slope compensation even at lower
than 50% duty cycle to improve the noise immunity. The
slope compensations should be optimized because too
much slope compensation can turn the converter into the
voltage-mode control. The amount of slope compensation
required depends on the downslope of the inductor cur-
rent when the main switch is off. The inductor downslope
depends on the input to output voltage differential of the
boost converter, inductor value, and the switching fre-
quency. Theoretically, the compensation slope should be
equal to 50% of the inductor downslope; however, a little
higher than 50% slope is advised.
Use the following equation to calculate the required
compensating slope (mc) for the boost converter:
The internal ramp signal resets at the beginning of
each cycle and slews at the rate programmed by the
external capacitor connected to SLOPE. Adjust the
MAX15004A/B/MAX15005A/B slew rate up to 110mV/μs
using the following equation:
where C
SLOPE
is the external capacitor at SLOPE in
farads.
C
mc mV
(
s
SLOPE
=
2 5 10
9
.
)
μ
mc
V
V
R
L
mV
(
s
OUT
IN
S
=
×
×
)
(
)
10
2
3
μ
P
V
I
INMAX
SUPPLY
T
DRIVE GATE
I
=
×
+
(
)
I
Q
f
DRIVE GATE
g
OUT
=
×
ESR
V
I
C
I
D
×
V
f
ESR
O
O
OUT
MAX
OUT
Q
=
=
×
M
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15005BAUE/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 |
| MAX15005BAUE/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 |
| MAX15005BAUE+ | 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 |
| MAX15005BAUE+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 |
| MAX15006AASA/V+ | 制造商:Maxim Integrated Products 功能描述:40V, ULTRA-LOW QUIESCENT-CURRENT LINEAR REGULATORS IN 6-PIN - Rail/Tube |
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