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参数资料
| 型号： | NCP1597AGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION NCP1597A |
| 设计资源： | NCP1597AGEVB Schematic NCP1597AGEVB BOM |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 最低可调至 0.8V |
| 电流 - 输出： | 2A |
| 输入电压： | 4 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1597A |
| 其它名称： | NCP1597AGEVBOS |
NCP1597A
P HSON + I
R DS(on)HS
(eq. 8)
maximum ambient temperature. Calculate the power lost in
the NCP1597A using the following equations:
1. High side MOSFET
The conduction loss in the top switch is:
2
RMS_HSFET
Where:
T J + T C ) P TOTAL @ q JC (eq. 15)
q JC is the junction ? to ? case thermal resistance equal to
1.7 ° C/W. T C is the temperature of the case and TJ is the
junction temperature, or die temperature. The
case ? to ? ambient thermal resistance is dependent on how
well heat can be transferred from the PC board to the air.
Solder the underside ? exposed pad to a large copper GND
I RMS_FET +
I out 2 )
D I PP
12
2
D
(eq. 9)
plane. If the die temperature reaches the thermal shutdown
threshold the NCP1597A shut down and does not restart
again until the die temperature cools by 30 ° C.
P HSSW +
D I PP is the peak ? to ? peak inductor current ripple.
The power lost due to switching the internal power high side
MOSFET is:
V in @ I out @ t r ) t f @ f SW (eq. 10)
2
t r and t f are the rise and fall times of the internal power
MOSFET measured at SW node.
2. Low side MOSFET
The power dissipated in the top switch is:
Layout Consideration
As with all high frequency switchers, when considering
layout, care must be taken in order to achieve optimal
electrical, thermal and noise performance. For 1.0MHz
switching frequency, switch rise and fall times are typically
in few nanosecond range. To prevent noise both radiated and
conducted the high speed switching current path must be
kept as short as possible. Shortening the current path will
also reduce the parasitic trace inductance of approximately
25 nH/inch. At switch off, this parasitic inductance
produces a flyback spike across the NCP1597A switch.
Where:
P LSON + I RMS_LSFET 2 @ R DS(on)LS
(eq. 11)
When operating at higher currents and input voltages, with
poor layout, this spike can generate voltages across the
NCP1597A that may exceed its absolute maximum rating.
I RMS_LSFET +
I out 2 )
D I PP
12
2
@ (1 * D)
(eq. 12)
A ground plane should always be used under the switcher
circuitry to prevent interplane coupling and overall noise.
The FB component should be kept as far away as possible
D I PP is the peak ? to ? peak inductor current ripple.
The switching loss for the low side MOSFET can be
ignored.
The power lost due to the quiescent current (I Q ) of the device
is:
P Q + V in @ I Q (eq. 13)
I Q is the switching quiescent current of the NCP1597A.
P TOTAL + P HSON ) P HSSW ) P LSON ) P Q (eq. 14)
Calculate the temperature rise of the die using the following
equation:
from the switch node. The ground for these components
should be separated from the switch current path. Failure to
do so will result in poor stability or subharmonic like
oscillation.
Board layout also has a significant effect on thermal
resistance. Reducing the thermal resistance from ground pin
and exposed pad onto the board will reduce die temperature
and increase the power capability of the NCP1597A. This is
achieved by providing as much copper area as possible
around the exposed pad. Adding multiple thermal vias under
and around this pad to an internal ground plane will also
help. Similar treatment to the inductor pads will reduce any
additional heating effects.
http://onsemi.com
12
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| NCP1597AMNTWG | 功能描述:直流/直流开关调节器 BUCK REGULATOR RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| NCP1597BGEVB | 功能描述:电源管理IC开发工具 EVB 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 |
| NCP1597BMNTWG | 功能描述:直流/直流开关调节器 SYNC BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| NCP1599GEVB | 功能描述:电源管理IC开发工具 NCP1599 EVB 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 |
| NCP1599MNTWG | 功能描述:直流/直流开关转换器 SYNC BUCK CONTROLLER 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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