参数资料
| 型号： | NCP5215MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYNC BUCK DUAL 40-QFN |
| 产品变化通告： | Product Discontinuation 01/Oct/2008 |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
NCP5215
OPERATION DESCRIPTION
General
The NCP5215, a high ? efficiency and
1.2MHz
fast ? transient ? response dual ? channel buck controller,
provides a multifunctional power solution for notebook
power system. 180 ° interleaved operation function
between the two channels has capabilities of reducing the
Fast
Response
CLK1
300kHz
PWM1
common input capacitor requirement and improving noise
immunity. Adaptive ? Voltage ? Positioning (AVP) control
OSC
(4*F SW )
1.2MHz
Digital Counter & 180 °
Phase Shift
Interleaved in CCM
reduces the requirement of output filter capacitors.
Programmable power ? saving operation ensures high
efficiency over entire load range. Input feedforward
voltage ? mode control is employed to deal with wide input
High Sampling
Rate
CLK2
300kHz
PWM2
voltage range. Transient ? Response ? Enhancement (TRE)
control for the both channels enables fast transient
response.
PWM Operation
The NCP5215 operates at a pin ? selectable normal
operation switching frequency, allowing 200 kHz,
300 kHz, or 400 kHz. As shown in Table 1, the connection
of the pin FSET determines normal operation frequency in
continuous ? conduction ? mode (CCM).
Table 1. SWITCHING FREQUENCY SELECTION
FSET Pin Float VCC GND
Fsw (kHz) 200 300 400
To speed up transient response and increase sampling
rate, an internal high ? frequency clock is employed, which
frequency is four times of the selected normal operating
frequency. As an instance, if the FSET pin is connected to
V CC , the normal switching frequency is set to 300 kHz. The
internal high ? frequency clock is 1.2 MHz. Figure 28
shows internal clocks of the NCP5215 in this case. The
1.2MHz high ? frequency clock with 50% duty ? ratio
introduced to the two PWM channels. A digital circuitry
generates two interleaved 300 kHz clocks using the
1.2 MHz clock and output them to the two PWM channels
as normal operation clocks in CCM, respectively.
Forced ? PWM Operation (FPWM Mode)
If the FPWM# pin is pulled low, the NCP5215 works
under forced ? PWM operation and thus always in CCM.
The two channels always run in selected fixed frequency
and 180 ° interleaved operation. In this mode, the low ? side
gate ? drive signal is forced to be the complement of the
high ? side gate ? drive signal. This mode allows reverse
inductor current, in such a way that it provides more
accurate voltage regulation and fast transient response.
During soft ? start operation, the NCP5215 automatically
runs in FPWM mode regardless of the FPWM# pin’s setting
1.2MHz
Figure 28. Internal Clocks in the NCP5215 as F SW =
300 kHz
Light ? Load Pulse ? Skipping Operation (Skip Mode)
If the skip mode is enabled by pulling high FPWM# pin,
the NCP5215 works in pulse ? skipping enabled operation
(PS).
In medium and high load range, the converter still runs
in CCM, and the switching frequency is fixed as the
selected frequency. If both channels run in CCM, they
operate interleaved.
In light load range, the converter will enter skip mode if
negative inductor current appears continuously. In the skip
mode, the bottom MOSFET will be turned off when the
inductor current is going negative. The top MOSFET’s
on ? time is fixed to around 1.5 times as the on ? time in
CCM. The NCP5215 continuously monitors the voltage at
FB pin and comparing to the voltage at VDRP Pin. When
the FB voltage drops below the VDRP voltage, a fixed
on ? time will be initiated at the time of the next coming
high ? frequency clock edge, which can be either rising edge
or falling edge. The minimum off ? time is half
high ? frequency cycle.
When the load increases and the inductor current
becomes continuous, the controller will automatically
return to fixed ? frequency operation and be synchronized to
the normal operation clock.
Transient Response Enhancement (TRE)
In the skip mode, the operation of the NCP5215 is similar
to constant on ? time scheme. The response time of the
controller is between half to one cycle of the
high ? frequency clock. However, for a conventional
trailing ? edge PWM controller in CCM, the fastest
response time is one switching cycle in the worst case. To
further improve transient response in CCM, a transient
to guarantee smooth powerup.
http://onsemi.com
13
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| NCP5218MNR2G | 功能描述:电压模式 PWM 控制器 2IN1 NOTEBK DDR CNTL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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