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参数资料
| 型号： | MAX15005AEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/27页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX15005A |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升/步降 |
| 输出及类型： | 3，隔离 |
| 输出电压： | 3V，110V，60V |
| 电流 - 输出： | 650mA，55mA，12mA |
| 输入电压： | 6.5 ~ 16 V |
| 稳压器拓扑结构： | 回扫 |
| 频率 - 开关： | 100kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15005A |
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MAX15004A/B/MAX15005A/B
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
100
MAX15005 MAXIMUM DUTY CYCLE
vs. OUTPUT FREQUENCY (f OUT )
1000
OSCILLATOR FREQUENCY (f OSC )
vs. RT/CT
95
90
85
80
75
70
65
60
CT = 3300p F
CT = 2200pF
CT = 1500pF
CT = 100pF
100
CT = 1500pF
CT = 2200pF
CT = 100pF
CT = 220pF
CT = 560pF
CT = 1000pF
55
CT = 1000pF
CT = 560pF
CT = 220pF
CT = 3300pF
50
10
10
100
1000
1
10
100
1000
OUTPUT FREQUENCY (kHz)
Figure 3a. MAX15005 Maximum Duty Cycle vs. Output
Frequency.
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-
RT (k Ω )
Figure 3b. Oscillator Frequency vs. RT/CT
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:
cy and total gate charge of the external MOSFET.
Error Amplifier
Slope compensation ( mV μ s ) =
2 . 5 × 10 ? 9 ( A)
C SLOPE
V OUT = ? 1 +
R B ? ?
?
R S =
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:
? R A ?
V REF
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.
14
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 :
V CS
I PRI
where I PRI is the peak current that flows through the
MOSFET at full load and minimum V IN .
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15005AEVKIT+ | 功能描述:电源管理IC开发工具 MAX15005A Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| 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 |
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