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| 型号： | MAX15035EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX15035 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | Quick-PWM™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 电流 - 输出： | 15A |
| 输入电压： | 4.5 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15035 |
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15A Step-Down Regulator with Internal Switches
When the on-time expires, the controller re-enables the
low-side MOSFET until the controller detects that the
inductor current drops below the zero-crossing thresh-
old. Starting with a negative inductor current pulse
greatly reduces the peak output voltage when com-
pared to starting with a positive inductor current pulse.
The output voltage at the beginning of the ultrasonic
pulse determines the negative ultrasonic current
threshold, resulting in the following equation:
V ISONIC = I L × 0 . 006 = ( V REFIN ? V FB ) × 0 . 7
where V FB > V REFIN .
Forced-PWM Mode ( S K I P = V DD )
The low-noise, forced-PWM mode ( SKIP = V DD ) dis-
ables the zero-crossing comparator, which controls the
low-side switch on-time. This forces the low-side gate-
drive waveform to constantly be the complement of the
high-side gate-drive waveform, so the inductor current
reverses at light loads while LX maintains a duty factor
of V OUT /V IN . The benefit of forced-PWM mode is to
keep the switching frequency fairly constant. However,
forced-PWM operation comes at a cost: the no-load 5V
bias current remains between 10mA to 50mA, depend-
ing on the switching frequency.
Automatic Pulse-Skipping Mode ( S K I P = GND or REF)
In skip mode ( SKIP = GND or 3.3V), an inherent auto-
matic switchover to PFM takes place at light loads. This
switchover is affected by a comparator that truncates
the low-side switch on-time at the inductor current’s
zero crossing. The zero-crossing comparator threshold
is set by the differential across LX to PGND.
DC output-accuracy specifications refer to the threshold
of the error comparator. When the inductor is in continu-
ous conduction, the MAX15035 regulates the valley of
the output ripple, so the actual DC output voltage is
higher than the trip level by 50% of the output ripple
voltage. In discontinuous conduction ( SKIP = GND and
I OUT < I LOAD(SKIP) ), the output voltage has a DC regu-
lation level higher than the error-comparator threshold
by approximately 1.5% due to slope compensation.
When SKIP is pulled to GND, the MAX15035 remains in
pulse-skipping mode. Since the output is not able to
sink current, the timing for negative dynamic output-volt-
age transitions depends on the load current and output
capacitance. Letting the output voltage drift down is
typically recommended to reduce the potential for audi-
ble noise since this eliminates the input current surge
during negative output-voltage transitions. See Figures
4 and 5.
The MAX15035 automatically always uses forced-PWM
operation during shutdown, regardless of the SKIP
configuration.
DYNAMIC REFIN WINDOW
REFIN
ACTUAL V OUT
OUTPUT
VOLTAGE
INTERNAL
PWM CONTROL
LX
INTERNAL TARGET
SKIP
NO PULSES: V OUT > V TARGET
PGOOD
OVP
DYNAMIC TRANSITION WHEN SKIP# = GND
Figure 4. Dynamic Transition when SKIP = GND
BLANK HIGH-Z
SET TO REF + 300mV
BLANK HIGH-Z
EA TARGET + 300mV
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15035EVKIT+ | 功能描述:电源管理IC开发工具 MAX15035 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 |
| MAX15036ATE/V+ | 功能描述:直流/直流开关转换器 2.2MHz 3A Buck wInt High-Side Switch RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX15036ATE/V+T | 功能描述:直流/直流开关转换器 2.2MHz 3A Buck wInt High-Side Switch RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX15036ATE+ | 功能描述:直流/直流开关转换器 2.2MHz 3A Buck wInt High-Side Switch RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX15036ATE+T | 功能描述:直流/直流开关转换器 2.2MHz 3A Buck wInt High-Side Switch RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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