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HIP6303 Datasheet(PDF) 12 Page - Renesas Technology Corp

Part No. HIP6303
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

HIP6303 Datasheet(HTML) 12 Page - Renesas Technology Corp

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HIP6303
FN4767 Rev.0.00
Page 12 of 16
December 1999
fully utilize the output-voltage tolerance range, the output
voltage is positioned in the upper half of the range when the
output is unloaded and in the lower half of the range when the
controller is under full load. This droop compensation allows
larger transient voltage deviations and thus reduces the size and
cost of the output filter components.
RIN should be selected to give the desired “droop” voltage at
the normal full load current 50
A applied through the RISEN
resistor (or at a different full load current if adjusted as under
“Over-Current, Selecting RISEN” above).
RIN = Vdroop / 50A
For a Vdroop of 80mV, RIN = 1.6k
A resistor from the feedback pin to ground raises the output
voltage above VID when the output is unloaded. The offset
resistor, (Ros), is selected based on RIN and the amount of
desired no-load offset, (VOS).
Ros = RIN x VID / VOS
Current Balancing
The detected currents are also used to balance the channel
currents.
Each channel’s current is compared to the average of all
channel currents, and the difference is used to create an offset
in that channel’s PWM comparator. The offset is in a direction
to reduce the imbalance.
The balancing circuit can not make up for a difference in
rDS(ON) between synchronous rectifiers. If a FET has a higher
rDS(ON), the current through that channel will be reduced.
Figures 8 and 9 show the inductor current of a two channel
system without and with current balancing.
Inductor Current
The inductor current in each channel of a multi-phase Buck
converter has two components. There is a current equal to the
load current divided by the number of channels (ILT / n), and a
sawtooth current, (iPK-PK) resulting from switching. The
sawtooth component is dependent on the size of the inductors,
the switching frequency of each channel, and the values of the
input and output voltage. Ignoring secondary effects, such as
series resistance, the peak to peak value of the sawtooth
current can be described by:
iPK-PK = (VIN x VCORE - VCORE2) / (L x FSW x VIN)
Where: VCORE = DC value of the output or VID voltage
VIN = DC value of the input or supply voltage
L = value of the inductor
FSW = switching frequency
Example: For VCORE= 1.6V,
VIN = 12V,
L= 1.3
H,
FSW= 250kHz,
Then iPK-PK = 4.3A
The inductor, or load current, flows alternately from VIN
through Q1 and from ground through Q2. The HIP6303
samples the on-state voltage drop across each Q2 transistor to
indicate the inductor current in that channel. The voltage drop
is sampled 1/3 of a switching period, 1/FSW, after Q1 is turned
OFF and Q2 is turned on. Because of the sawtooth current
component, the sampled current is different from the average
current per channel. Neglecting secondary effects, the
sampled current (ISAMPLE) can be related to the load current
(ILT) by:
ISAMPLE = ILT / n + (VINVCORE - 3VCORE2) / (6L x FSW x VIN)
Where: ILT = total load current
n = the number of channels
Example: Using the previously given conditions, and
For ILT = 100A,
n= 4
Then ISAMPLE = 25.49A.
0
5
10
15
20
25
FIGURE 8. TWO CHANNEL MULTIPHASE SYSTEM WITH
CURRENT BALANCING DISABLED
0
5
10
15
20
25
FIGURE 9. TWO CHANNEL MULTIPHASE SYSTEM WITH
CURRENT BALANCING ENABLED


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