HIP6311CB Intersil, HIP6311CB Datasheet - Page 11
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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
-
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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HIP6311CB
Manufacturer:
INTERSIL
Quantity:
435
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Manufacturer:
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Quantity:
20 000
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Part Number:
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Manufacturer:
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Current Sensing and Balancing
Overview
The HIP6311 samples the on-state voltage drop across each
synchronous rectifier FET, Q2, as an indication of the
inductor current in that phase, see Figure 7. Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply r
inductor current, is either 1/2, 1/3, or 1/4 of the total current
(I
The voltage at Q2’s drain, the PHASE node, is applied to the
R
ISEN pin. This pin is held at virtual ground, so the current
through R
The I
following functions:
1. Detection of an over-current condition
2. Reduce the regulator output voltage with increasing load
3. Balance the I
LT
ISEN
), depending on how many phases are in use.
current (droop)
ISEN
FB
resistor to develop the I
DS(ON)
ISEN
current provides information to perform the
CURRENT
TO OVER
REFERENCE
AMPLIFIER
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
(Q2) x inductor current (I
is I
R
ERROR
+
-
TRIP
FB
L
DAC
R
L
currents in multiple channels
IN
x r
C
COMPARATOR
DS(ON)
c
CHANNELS
TO OTHER
COMP
11
(Q2) / R
GENERATOR
ISEN
SAWTOOTH
CORRECTION
+
+
-
current to the HIP6311
DIFFERENCE
-
ISEN
L
). Note that I
REFERENCE
.
-
+
AVERAGING
COMPARATOR
+
-
L
, the
HIP6311
HIP6311
HIP6311
CURRENT
SENSING
CURRENT
SENSING
FROM
OTHER
CHANNELS
CIRCUIT
PWM
Over-Current, Selecting R
The current detected through the R
with the current(s) detected in the other 1, 2, or 3 channels.
The averaged current is compared with a trimmed, internally
generated current, and used to detect an over-current
condition.
The nominal current through the R
50µA at full output load current, and the nominal trip point for
over-current detection is 165% of that value, or 82.5µA.
Therefore, R
For a full load of 25A per phase, and an r
4mΩ, R
The over-current trip point would be 165% of 25A, or ~ 41A
per phase. The R
over-current trip point, but it is suggested to stay within
±25% of nominal.
Droop, Selection of R
The average of the currents detected through the R
resistors is also steered to the FB pin. There is no DC return
path connected to the FB pin except for R
PWM
ISEN
I
SEN
ISEN
= 2kΩ.
ONLY ONE OUTPUT
HIP6601
ISEN
= I
L
STAGE SHOWN
R
x r
ISEN
value can be adjusted to change the
CURRENT(S)
DS(ON)
IN
CHANNELS
INDUCTOR
Q2
V
IN
OTHER
ISEN
FROM
Q1
(Q2) / 50µA.
ISEN
PHASE
ISEN
L
I
01
L
resistor should be
resistor is averaged
DS(ON)
IN
, so the average
December 27, 2004
V
CORE
(Q2) of
ISEN
FN4817.3