HIP6302VCB-T Intersil, HIP6302VCB-T Datasheet - Page 8

• Manufacturer Part Number: HIP6302VCB-T
• Description: IC CTRLR PWM MULTIPHASE 16-SOIC
• Manufacturer: Intersil

Specifications of HIP6302VCB-T

• Pwm Type: Controller
• Number Of Outputs: 4
• Frequency - Max: 336kHz
• 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: 16-SOIC (3.9mm Width)
• Frequency-max: 336kHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Duty Cycle: -

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
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
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE HIP6301V VOLTAGE AND CURRENT CONTROL LOOPS FOR 2-PHASE REGULATOR
FB
AMPLIFIER
DAC
PROGRAMMABLE
REFERENCE
ERROR
-
+
RIN
L1
and I
L2
CORRECTION
CORRECTION
, of the two power channels. The
+
+
-
-
8
∑
∑
∑
∑
-
-
I AVERAGE
+
+
+
-
+
-
COMPARATOR
AVERAGING
COMPARATOR
CURRENT
HIP6301V, HIP6302V
HIP6301V, HIP6302V
CURRENT
CURRENT
SENSING
SENSING
IN
CIRCUIT
CIRCUIT
PWM
PWM
CIRCUIT with no phase reversal and on to the HIP6601B,
again with no phase reversal for gate drive to the upper
MOSFETs, Q
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
Q
scales the voltage across the MOSFETs to a current that is
applied to the current sensing circuit within the controller.
Output from these sensing circuits is applied to the current
averaging circuit. Each PWM channel receives the
difference 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 output pulse width of the
comparator to compensate for the detected “above average”
current in that channel.
4
, when they are conducting. A single resistor converts and
PWM1
PWM2
ISEN1
ISEN2
HIP6601B
HIP6601B
1
and Q
RISEN2
RISEN1
DS(ON)
3
Q2
Q4
. Increased duty cycle or ON-time for
VIN
VIN
Q1
Q3
of the lower MOSFETs, Q
PHASE
PHASE
L01
IL1
L02
IL2
VCORE
COUT
May 5, 2008
2
RLOAD
FN9034.3
and