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參數(shù)資料
| 型號： | MAX15004BAUE |
| 廠商： | 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輸入汽車反激/升壓/ SEPIC電源控制器 |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 547K |
| 代理商： | MAX15004BAUE |
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M
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
14
______________________________________________________________________________________
n-Channel MOSFET Driver
OUT drives the gate of an external n-channel MOSFET.
The driver is powered by the internal regulator (V
CC
),
internally set to approximately 7.4V. If an external voltage
higher than 7.4V is applied at V
CC
(up to 10V), it appears
as the peak gate drive voltage. The regulated V
CC
volt-
age keeps the OUT voltage below the maximum gate
voltage rating of the external MOSFET. OUT can source
750mA and sink 1000mA peak current. The average cur-
rent sourced by OUT depends on the switching frequen-
cy and total gate charge of the external MOSFET.
Error Amplifier
The MAX15004A/B/MAX15005A/B include an internal
error amplifier. The noninverting input of the error
amplifier is connected to the internal 1.228V reference
and feedback is provided at the inverting input. High
100dB open-loop gain and 1.6MHz unity-gain band-
width allow good closed-loop bandwidth and transient
response. Moreover, the source and sink current capa-
bility of 2mA provides fast error correction during the
output load transient. For Figure 5, calculate the power-
supply output voltage using the following equation:
where V
REF
= 1.228V. The amplifier’s noninverting input
is internally connected to a soft-start circuit that gradu-
ally increases the reference voltage during startup. This
forces the output voltage to come up in an orderly and
well-defined manner under all load conditions.
Slope Compensation
The MAX15004A/B/MAX15005A/B use an internal ramp
generator for slope compensation. The internal ramp
signal resets at the beginning of each cycle and slews
at the rate programmed by the external capacitor con-
nected to SLOPE. The amount of slope compensation
needed depends on the downslope of the current
waveform. 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.
Current Limit
The current-sense resistor (R
CS
), connected between
the source of the MOSFET and ground, sets the current
limit. The CS input has a voltage trip level (V
CS
) of
305mV. The current-sense threshold has 5% accuracy.
Set the current-limit threshold 20% higher than the peak
switch current at the rated output power and minimum
input voltage. Use the following equation to calculate
the value of R
S
:
where I
PRI
is the peak current that flows through the
MOSFET at full load and minimum V
IN
.
R
V
I
PRI
S
CS
=
Slope compensation mV
s
A
( )
C
SLOPE
(
)
.
μ
=
2 5 10
9
V
R
R
V
OUT
A
B
REF
=
+
1
Figure 3a. MAX15005 Maximum Duty Cycle vs. Output
Frequency.
MAX15005 MAXIMUM DUTY CYCLE
vs. OUTPUT FREQUENCY (f
OUT
)
OUTPUT FREQUENCY (kHz)
M
50
55
60
65
70
75
80
85
90
95
100
10
100
1000
CT = 220pF
CT = 1500pF
CT = 1000pF
CT = 560pF
CT = 2200pF
CT = 3300pF
CT = 100pF
Figure 3b. Oscillator Frequency vs. RT/CT
OSCILLATOR FREQUENCY (f
OSC
)
vs. RT/CT
RT (k
)
O
1
10
100
1000
10
100
1000
CT = 220pF
CT = 1500pF
CT = 1000pF
CT = 560pF
CT = 2200pF
CT = 3300pF
CT = 100pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX15005 | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15005AAUE | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15005BAUE | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15012_07 | 175V/2A, High-Speed, Half-Bridge MOSFET Drivers |
| MAX15012AASA | 175V/2A, High-Speed, Half-Bridge MOSFET Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX15004BAUE/V+ | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX15004BAUE/V+T | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX15004BAUE+ | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX15004BAUE+T | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX15005AAUE/V+ | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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