hip6301vcbza-t Intersil Corporation, hip6301vcbza-t Datasheet - Page 8

• Manufacturer Part Number: hip6301vcbza-t
• Description: Microprocessor Core Voltage Regulator Multiphase Buck Pwm Controller
• Manufacturer: Intersil Corporation

Electrical Specifications
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 the
output currents, I
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 R
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
Percent Overvoltage Hysteresis
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6301V VOLTAGE AND CURRENT CONTROL LOOPS FOR
FB
AMPLIFIER
DAC
PROGRAMMABLE
REFERENCE
ERROR
-
+
PARAMETER
TWO-PHASE REGULATOR
RIN
L1
and I
L2
CORRECTION
CORRECTION
, of the two power channels. The
+
+
-
-
8
∑
∑
∑
∑
Operating Conditions: V
-
-
I AVERAGE
+
+
VSEN Falling after Overvoltage
+
-
+
-
COMPARATOR
AVERAGING
COMPARATOR
CURRENT
HIP6301V, HIP6302V
HIP6301V, HIP6302V
CC
= 5V, T
CURRENT
CURRENT
SENSING
SENSING
IN
TEST CONDITIONS
CIRCUIT
CIRCUIT
A
PWM
PWM
= 0°C to 70°C, Unless Otherwise Specified
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.
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
PWM1
PWM2
ISEN1
ISEN2
HIP6601B
HIP6601B
RISEN2
RISEN1
Q2
Q4
VIN
VIN
Q1
Q3
PHASE
PHASE
MIN
L01
-
IL1
L02
IL2
TYP
2
VCORE
COUT
December 27, 2004
MAX
-
RLOAD
FN9034.2
UNITS
%