HIP6311CB Intersil, HIP6311CB Datasheet - Page 7
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HIP6311CB
Manufacturer Part Number
HIP6311CB
Description
IC CTRLR PWM MULTIPHASE 20-SOIC
Manufacturer
Intersil
Datasheet
1.HIP6311CBZ.pdf
(17 pages)
Specifications of HIP6311CB
Pwm Type
Controller
Number Of Outputs
4
Frequency - Max
305kHz
Voltage - Supply
4.75 V ~ 5.25 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
20-SOIC (7.5mm Width)
Frequency-max
305kHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Duty Cycle
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HIP6311CB
Manufacturer:
INTERSIL
Quantity:
435
Part Number:
HIP6311CB
Manufacturer:
HARRIS
Quantity:
20 000
Company:
Part Number:
HIP6311CB-T
Manufacturer:
INTERSIL
Quantity:
3 000
Company:
Part Number:
HIP6311CB-T
Manufacturer:
KYOCERA
Quantity:
23 669
Part Number:
HIP6311CB-T
Manufacturer:
INTERSIL
Quantity:
20 000
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, 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
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
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6311 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
FB
AMPLIFIER
PROGRAMMABLE
REFERENCE
DAC
ERROR
-
+
CHANNEL REGULATOR
R
IN
L1
and I
L2
CORRECTION
CORRECTION
, of the two power channels. The
+
+
-
-
7
∑
∑
∑
∑
-
-
I AVERAGE
+
+
+
-
+
-
COMPARATOR
AVERAGING
COMPARATOR
CURRENT
HIP6311
CURRENT
CURRENT
SENSING
SENSING
IN
HIP6311
HIP6311
CIRCUIT
CIRCUIT
PWM
PWM
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 r
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 HIP6311.
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
PWM1
PWM2
I
I
SEN1
SEN2
HIP6601
HIP6601
R
R
ISEN2
ISEN1
DS(ON)
Q2
Q4
V
V
IN
IN
Q1
Q3
of each lower MOSFET, Q2 and
PHASE
PHASE
L
I
01
L1
L
I
02
L2
V
C
CORE
December 27, 2004
OUT
R
FN4817.3
LOAD