参数资料
| 型号： | NCP5386MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 23/33页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 1/2PHASE 32-QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 4.75 V ~ 5.25 V |
| 输出数： | 2 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
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NCP5386, NCP5386A, NCP5386B
FUNCTIONAL DESCRIPTION
General
The NCP5386/A/B dual edge modulated multiphase
PWM controller is specifically designed with the necessary
Schematic. In 1 ? Phase mode, gate output G2 must be left
open as shown in the 1 ? phase Applications Schematic. The
CS2 and CS2N inputs should be connected to CS1N. The
following truth table summarizes the modes of operation:
features for a high current VR10, VR11 or AMD CPU and
chipset power system. The IC consists of the following
blocks: Precision Programmable DAC, Differential
Mode
Gate Output Connections
G1 G2
Remote Voltage Sense Amplifier, High Performance
Voltage Error Amplifier, Differential Current Feedback
Amplifiers, Precision Oscillator and Triangle Wave
1 ? Phase
2 ? Phase
Normal
Normal
OPEN
Normal
Generators, and PWM Comparators. Protection features
include Undervoltage Lockout, Soft ? Start, Overcurrent
Protection, Overvoltage Protection, and Power Good
Monitor.
Remote Output Sensing Amplifier (RSA)
A true differential amplifier allows the NCP5386/A/B to
measure VCore voltage feedback with respect to the Vcore
ground reference point by connecting the Vcore reference
point to VS+, and the Vcore ground reference point to VS ? .
This configuration keeps ground potential differences
between the local controller ground and the Vcore ground
reference point from affecting regulation of Vcore between
VCore and VCore ground reference points. The RSA also
subtracts the DAC (minus V ID offset) voltage, thereby
producing an unamplified output error voltage at the
DIFFOUT pin. This output also has a 1.3 V bias voltage to
allow both positive and negative error voltages.
Precision Programmable DAC
A precision programmable DAC is provided. This DAC
has 0.5% accuracy over the entire operating temperature
range of the part. The DAC can be programmed to support
either Intel VR10 or VR11 or AMD K8 specifications. A
program selection pin is provided to accomplish this. This pin
also sets the startup mode of operation. Connect this pin to
1.25 V to select the VR11 DAC table and startup mode.
Connect this pin to ground to select the VR10 DAC table and
the VR11 startup mode. Connect this pin to V REF to select the
AMD DAC table and startup mode.
High Performance Voltage Error Amplifier
The error amplifier is designed to provide high slew rate
and bandwidth. Although not required when operating as
the controller of a voltage regulator, a capacitor from
COMP to V FB is required for stable unity gain test
configurations.
Gate Driver Outputs and 1/2 Phase Operation
The part can be configured to run in 1 ? or 2 ? Phase mode.
In 2 ? phase mode, phases 1 and 2 should be used to drive the
external gate drivers as shown in the 2 ? phase Applications
These are the only allowable connection schemes to
program the modes of operation.
Differential Current Sense Amplifiers
Two differential amplifiers are provided to sense the
output current of each phase. The inputs of each current
sense amplifier must be connected across the current
sensing element of the phase controlled by the
corresponding gate output (G1 or G2). If a phase is
unused, the differential inputs to that phase’s current
sense amplifier must be shorted together and connected
to CS1N as shown in the 1 ? Phase Application
Schematics .
A voltage is generated across the current sense element
(such as an inductor or sense resistor) by the current
flowing in that phase. The output of the current sense
amplifiers are used to control three functions. First, the
output controls the adaptive voltage positioning, where the
output voltage is actively controlled according to the
output current. In this function, all of the current sense
outputs are summed so that the total output current is used
for output voltage positioning. Second, the output signal is
fed to the current limit circuit. This again is the summed
current of all phases in operation. Finally, the individual
phase current is connected to the PWM comparator. In this
way current balance is accomplished.
Oscillator and Triangle Wave Generator
A programmable precision oscillator is provided. The
oscillator ’s frequency is programmed by the resistance
connected from the ROSC pin to ground. The user will
usually form this resistance from two resistors in order to
create a voltage divider that uses the ROSC output voltage
as the reference for creating the current limit setpoint
voltage. The oscillator frequency range is 100 kHz/phase
to 1.0 MHz/phase. The oscillator generates up to 4 triangle
waveforms (symmetrical rising and falling slopes)
between 1.3 V and 2.3 V. The triangle waves have a phase
delay between them such that for 2 ? phase operation the
PWM outputs are separated by 180 angular degrees,
respectively.
http://onsemi.com
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