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| 型号： | NCP3020ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 84% |
| 电源电压： | 4.7 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | NCP3020ADR2GOSDKR |
NCP3020A, NCP3020B, NCV3020A, NCV3020B
DETAILED DESCRIPTION
OVERVIEW
The NCP3020A/B operates as a 300/600 kHz, voltage
mode, pulse width modulated, (PWM) synchronous buck
converter. It drives high ? side and low ? side N ? channel power
MOSFETs. The NCP3020 incorporates an internal boost
circuit consisting of a boost clamp and boost diode to provide
supply voltage for the high side MOSFET gate driver. The
NCP3020 also integrates several protection features including
input undervoltage lockout (UVLO), output undervoltage
(OUV), output overvoltage (OOV), adjustable high ? side
current limit (I SET and I LIM ), and thermal shutdown (TSD).
The operational transconductance amplifier (OTA)
provides a high gain error signal from Vout which is
compared to the internal 1.5 V pk-pk ramp signal to set the
duty cycle converter using the PWM comparator. The high
side switch is turned on by the positive edge of the clock
cycle going into the PWM comparator and flip flop
following a non-overlap time. The high side switch is turned
off when the PWM comparator output is tripped by the
modulator ramp signal reaching a threshold level
established by the error amplifier. The gate driver stage
incorporates fixed non ? overlap time between the high ? side
and low ? side MOSFET gate drives to prevent cross
conduction of the power MOSFET’s.
POR and UVLO
The device contains an internal Power On Reset (POR) and
input Undervoltage Lockout (UVLO) that inhibits the internal
logic and the output stage from operating until V CC reaches its
respective predefined voltage levels (4.3 V typical).
Startup and Shutdown
Once V CC crosses the UVLO rising threshold the device
begins its startup process. Closed ? loop soft ? start begins
after a 400 m s delay wherein the boost capacitor is charged,
and the current limit threshold is set. During the 400 m s delay
the OTA output is set to just below the valley voltage of the
internal ramp. This is done to reduce delays and to ensure a
consistent pre ? soft ? start condition. The device increases the
internal reference from 0 V to 0.6 V in 24 discrete steps
while maintaining closed loop regulation at each step. Each
step contains 64 switching cycles. Some overshoot may be
evident at the start of each step depending on the voltage
loop phase margin and bandwidth. The total soft ? start time
is 6.8 ms for the NCP3020A and 4.4 ms for the NCP3020B.
Internal Reference Voltage
Internal Ramp
OTA Output
0.7 V
0V
25 mV Steps
24 Voltage Steps
Figure 21. Soft ? Start Details
http://onsemi.com
9
0.6 V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP3020AGEVB | 功能描述:电源管理IC开发工具 NCP3020A EVALUATION BOARD 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 |
| NCP3020B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Synchronous PWM Controller |
| NCP3020BDR2G | 功能描述:软开关 PWM 控制器 SYNC PWM CNTRL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP3020BGEVB | 功能描述:电源管理IC开发工具 NCP3020A EVALUATION BOARD 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 |
| NCP302HSN09T1 | 功能描述:电压监测器/监控器 0.9V Detector RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
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