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HIP6311A Datasheet(PDF) 7 Page - Renesas Technology Corp

Part No. HIP6311A
Description  Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HIP6311A Datasheet(HTML) 7 Page - Renesas Technology Corp

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HIP6311A
FN9035 Rev 1.00
Page 7 of 16
July 2004
Operation
Figure 1 shows a simplified diagram of the voltage regulation
and current control loops. Both voltage and current feedback
are used to precisely regulate voltage and tightly control output
currents, IL1 and IL2, of the two power channels. The voltage
loop comprises the Error Amplifier, Comparators, gate drivers
and output MOSFETS. The Error Amplifier is essentially
connected as a voltage follower that has as an input, the
Programmable Reference DAC and an output that is the
CORE voltage.
Voltage Loop
Feedback from the CORE voltage is applied via resistor RIN to
the inverting input of the Error Amplifier. This signal can drive
the Error Amplifier output either high or low, depending upon
the CORE voltage. Low CORE voltage makes the amplifier
output move towards a higher output voltage level. Amplifier
output voltage is applied to the positive inputs of the
Comparators via the Correction summing networks. Out-of-
phase sawtooth signals are applied to the two Comparators
inverting inputs. Increasing Error Amplifier voltage results in
increased Comparator output duty cycle. This increased duty
cycle signal is passed through the PWM CIRCUIT with no
phase reversal and on to the HIP6601, again with no phase
reversal for gate drive to the upper MOSFETs, Q1 and Q3.
Increased duty cycle or ON time for the MOSFET transistors
results in increased output voltage to compensate for the low
output voltage sensed.
Current Loop
The current control loop works in a similar fashion to the
voltage control loop, but with current control information
applied individually to each channel’s Comparator. The
information used for this control is the voltage that is developed
across rDS(ON) of each lower MOSFET, Q2 and Q4, when
they are conducting. A single resistor converts and scales the
voltage across the MOSFETs to a current that is applied to the
Current Sensing circuit within the HIP6311A. Output from
these sensing circuits is applied to the current averaging
circuit. Each PWM channel receives the difference current
signal from the summing circuit that compares the average
sensed current to the individual channel current. When a
power channel’s current is greater than the average current,
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6311A VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
+
RISEN1
+
CORRECTION
ERROR
AMPLIFIER
FB
REFERENCE
ISEN1
RIN
VCORE
Q3
Q4
L02
PHASE
PWM1
IL2
DAC
HIP6311A
COUT
RLOAD
VIN
HIP6601
-
Q1
Q2
L01
PHASE
IL1
VIN
HIP6601
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
CORRECTION
PWM2
-
I AVERAGE
+
+
+
-
PROGRAMMABLE
RISEN2
ISEN2
-
-
-
-
+
+
CURRENT
AVERAGING


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