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ISL6552 Datasheet(PDF) 8 Page - Renesas Technology Corp

Part # ISL6552
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

ISL6552 Datasheet(HTML) 8 Page - Renesas Technology Corp

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ISL6552
FN4918 Rev 2.00
Page 8 of 18
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 ISL6552. 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, the signal applied via the
summing correction circuit to the comparator, reduces the
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
+
RISEN1
+
CORRECTION
ERROR
AMPLIFIER
FB
REFERENCE
ISEN1
RIN
VCORE
Q3
Q4
L2
PHASE
PWM1
IL2
DAC
ISL6552
COUT
RLOAD
VIN
HIP6601
-
Q1
Q2
L1
PHASE
IL1
VIN
HIP6601
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
CORRECTION
PWM2
-
I AVERAGE
+
+
-
PROGRAMMABLE
RISEN2
ISEN2
-
CURRENT
AVERAGING
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6552 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR
+
-
+
-
+
-


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