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HIP6301 Datasheet(PDF) 7 Page - Renesas Technology Corp

Part No. HIP6301
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

HIP6301 Datasheet(HTML) 7 Page - Renesas Technology Corp

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HIP6301
FN4765 Rev 6.00
Page 7 of 17
December 27, 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 HIP6601B,
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.
PROTECTION
Overvoltage Threshold
VSEN Rising
1.12
1.15
1.2
VDAC
Percent Overvoltage Hysteresis
VSEN Falling after Overvoltage
-
2
-
%
Electrical Specifications
Operating Conditions: VCC = 5V, TA = 0°C to 70°C, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
+
RISEN1
+
CORRECTION
ERROR
AMPLIFIER
FB
REFERENCE
ISEN1
RIN
VCORE
Q3
Q4
L02
PHASE
PWM1
IL2
DAC
HIP6303
COUT
RLOAD
VIN
HIP6601B
-
Q1
Q2
L01
PHASE
IL1
VIN
HIP6601B
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
CORRECTION
PWM2
-
I AVERAGE
+
+
+
-
PROGRAMMABLE
RISEN2
ISEN2
-
-
-
-
+
+
CURRENT
AVERAGING
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6301 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR


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