NCP5392 ON Semiconductor, NCP5392 Datasheet - Page 20

• Manufacturer Part Number: NCP5392
• Description: 2/3/4-Phase Controller
• Manufacturer: ON Semiconductor

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General
which combines differential voltage sensing, differential
phase current sensing, and adaptive voltage positioning to
provide accurately regulated power necessary for both
Intel VR11.1 and AMD CPU power system. NCP5392 has
been designed to work with the NCP5359 driver.
Remote Output Sensing Amplifier(RSA)
measure V
ground reference point by connecting the V
point to VSP, and the V
This configuration keeps ground potential differences
between the local controller ground and the V
reference point from affecting regulation of V
V
subtracts the DAC (minus VID offset) voltage, thereby
producing an unamplified output error voltage at the
DIFFOUT pin. This output also has a 1.3 V bias voltage as
the floating ground to allow both positive and negative
error voltages.
Precision Programmable DAC
trimmed. This DAC has 0.5% accuracy over the entire
operating temperature range of the part. The DAC can be
programmed to support either Intel VR11 or AMD 6−bit
VID code specifications.
High Performance Voltage Error Amplifier
and bandwidth. Although not required when operating as
the controller of a voltage regulator, a capacitor from
COMP to VFB is required for stable unity gain test
configurations.
Gate Driver Outputs and 2/3/4 Phase Operation
mode. In 2−phase mode, phases 1 and 3 should be used to
drive the external gate drivers as shown in the 2−phase
Applications Schematic, G2 and G4 must be grounded. In
3−phase mode, gate output G4 must be grounded as shown
in the 3−phase Applications Schematic. In 4−phase mode
all 4 gate outputs are used as shown in the 4−phase
Applications Schematic. The Current Sense inputs of
unused channels should be connected to VCCP shown in
the Application Schematics. Please refer to table “PIN
CONNECTIONS vs. PHASE COUNTS” for details.
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The NCP5392 provides up to four−phase buck solution
A true differential amplifier allows the NCP5392 to
A precision programmable DAC is provided and system
The error amplifier is designed to provide high slew rate
The part can be configured to run in 2−, 3−, or 4−phase
and V
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voltage feedback with respect to the V
ground reference points. The RSA also
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ground reference point to VSN.
FUNCTIONAL DESCRIPTION
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reference
between
ground
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Differential Current Sense Amplifiers and Summing
Amplifier
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, G2, G3, or G4). If a phase
is unused, the differential inputs to that phase’s current
sense amplifier must be shorted together and connected to
the output as shown in the 2− and 3−phase Application
Schematics.
a summing amplifier to have a summed−up output (CSSUM).
Signal of CSSUM combines information of total current of all
phases in operation.
functions. First, the summing current signal (CCSUM) of
all phases will go through DROOP amplifier and join the
voltage feedback loop for output voltage positioning.
Second, the output signal from DROOP amplifier also goes
to ILIM amplifier to monitor the output current limit.
Finally, the individual phase current contributes to the
current balance of all phases by offsetting their ramp
signals of PWM comparators.
Thermal Compensation Amplifier with VDRP and VDFB
Pins
in the path of droop current feedback for additional
adjustment of the gain of summing current and temperature
compensation.
implemented separately ensures minimum interference to
the voltage loop compensation network.
Oscillator and Triangle Wave Generator
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 per
phase to 1.0 MHz per phase. The oscillator generates up to
4 symmetrical triangle waveforms with amplitude between
1.3 V and 2.3 V. The triangle waves have a phase delay
between them such that for 2−, 3− and 4−phase operation
the PWM outputs are separated by 180, 120, and 90 angular
degrees, respectively.
Four differential amplifiers are provided to sense the
The current signals sensed from inductor DCR are fed into
The outputs of current sense amplifiers control three
Thermal compensation amplifier is an internal amplifier
A programmable precision oscillator is provided. The
The way thermal compensation is