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参数资料
| 型号： | MAX15005AEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/27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
operation of the power supply; however, to reduce the
power dissipation of the internal LDO, it can be dis-
abled by applying an external voltage higher than 7.4V
V IN
at V CC (LDO output). The LDO then stops drawing cur-
rent from IN, thereby reducing the power dissipation in
the IC. The V CC voltage is clamped to 10.4V with 30mA
current sink in case there is a higher voltage at the bias
winding. This feature is useful in applications with con-
tinuous higher input voltage.
The second 5V LDO regulator from V CC to REG5 pro-
vides power to the internal control circuits. This LDO can
also be used to source 15mA of external load current.
Bypass V CC and REG5 with a parallel combination of
MAX15004A/B
MAX15005A/B
1.23V
ON/OFF
R1
R2
1μF and 0.1μF low-ESR ceramic capacitors. Additional
capacitors (up to 22μF) at V CC can be used although
they are not necessary for proper operation of the
MAX15004/MAX15005.
Startup Operation/UVLO/ON/ OFF
The MAX15004A/B/MAX15005A/B feature two under-
voltage lockouts (UVLO). The internal UVLO monitors
the V CC -regulator and turns on the converter once V CC
rises above 3.5V. The internal UVLO circuit has about
0.5V hysteresis to avoid chattering during turn-on. Once
the power is on and the bootstrapped voltage feeds
V CC , IN voltage can drop below 4V. This feature pro-
Figure 1. Setting the MAX15004A/B/MAX15005A/B
Undervoltage Lockout Threshold
and also controls the soft-start period. At startup, after
V IN is applied and the UVLO thresholds are reached,
the device enters soft-start. During soft-start, 15μA is
sourced into the capacitor (C SS ) connected from SS to
GND causing the reference voltage to ramp up slowly.
The HICCUP mode of operation is disabled during soft-
start. When V SS reaches 1.228V, the output as well as
the HICCUP mode become fully active. Set the soft-start
time (t SS ) using following equation:
15 × 10 ? 6 ( )
vides operation at a cold-crank voltage as low as 2.5V.
An external undervoltage lockout can be achieved by
controlling the voltage at the ON/ OFF input. The
t SS =
1 . 23(V ) × C SS
A
ON/ OFF input threshold is set at 1.23V (rising) with
75mV hysteresis.
Before any operation can commence, the ON/ OFF volt-
age must exceed the 1.23V threshold.
Calculate R1 in Figure 1 by using the following formula:
where t SS is in seconds and C SS is in farads.
The soft-start programmability is important to control the
input inrush current issue and also to avoid the
MAX15004/MAX15005 power supply from going into the
unintentional hiccup during the startup. The required
R 1 = ?
? 1 ? × R 2
? V ON
? V UVLO
?
?
soft-start time depends on the topology used, current-
limit setting, output capacitance, and the load condition.
Oscillator Frequency/
where V UVLO is the ON/ OFF ’s 1.23V rising threshold,
and V ON is the desired input startup voltage. Choose
an R2 value in the 100k Ω range. The UVLO circuits
keep the PWM comparator, ILIM comparator, oscillator,
and output driver shut down to reduce current con-
sumption (see the Functional Diagram). The ON/ OFF
input can be used to disable the MAX15004/MAX15005
and reduce the standby current to less than 20μA.
Soft-Start
The MAX15004/MAX15005 are provided with an exter-
nally adjustable soft-start function, saving a number of
external components. The SS is a 1.228V reference
bypass connection for the MAX15004A/B/MAX15005A/B
12
External Synchronization
Use an external resistor and capacitor at RTCT to pro-
gram the MAX15004A/B/MAX15005A/B internal oscillator
frequency from 15kHz to 1MHz. The MAX15004A/B out-
put switching frequency is one-half the programmed
oscillator frequency with a 50% maximum duty-cycle
limit. The MAX15005A/B output switching frequency is
the same as the oscillator frequency. The RC network
connected to RTCT controls both the oscillator frequency
and the maximum duty cycle. The CT capacitor charges
and discharges from (0.1 x V REG5 ) to (0.55 x V REG5 ). It
charges through RT and discharges through an internal
trimmed controlled current sink. The maximum duty
cycle is inversely proportional to the discharge time
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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