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HIP6303 Datasheet(PDF) 11 Page - Intersil Corporation

Part No. HIP6303
Description  Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HIP6303 Datasheet(HTML) 11 Page - Intersil Corporation

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11
Current Sensing and Balancing
Overview
The HIP6303 samples the on-state voltage drop across each
synchronous rectifier FET, Q2, as an indication of the
inductor current in that channel, see Figure 7. Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply rDS(ON)(Q2) x inductor current (IL). Note that IL, the
inductor current, is either 1/2, 1/3, or 1/4 of the total current
(ILT), depending on how many channels are active.
The voltage at Q2’s drain, the PHASE node, is applied to the
RISEN resistor to develop the IISEN current to the HIP6303
ISEN pin. This pin is held at virtual ground, so the current
through RISEN is IL x rDS(ON)(Q2) / RISEN.
The IISEN current provides information to perform the
following functions:
1. Detection of an over-current condition
2. Reduce the regulator output voltage with increasing load
current (droop)
3. Balance the IL currents in multiple channels
Over-Current, Selecting RISEN
The current detected through the RISEN resistor is averaged
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 RISEN resistor should be
50
µA at full output load current, and the nominal trip point for
over-current detection is 165% of that value, or 82.5
µA.
Therefore, RISEN = IL x rDS(ON) (Q2) / 50µA.
For a full load of 25A per channel, and an rDS(ON) (Q2) of
4m
Ω, RISEN = 2kΩ.
The over-current trip point would be 165% of 25A, or ~ 41A
per channel. The RISEN value can be adjusted to change the
over-current trip point, but it is suggested to stay within
±25%
of nominal.
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
AVERAGING
CURRENT
FROM
OTHER
CHANNELS
SAWTOOTH
GENERATOR
+
DIFFERENCE
RISEN
+
CORRECTION
ERROR
AMPLIFIER
FB
COMP
REFERENCE
TO OTHER
CHANNELS
ISEN
RIN
RFB
Cc
VCORE
Q1
Q2
COMPARATOR
REFERENCE
TO OVER
CURRENT
TRIP
L01
PHASE
INDUCTOR
CURRENT(S)
FROM
OTHER
CHANNELS
PWM
IL
DAC
HIP6303
VIN
ONLY ONE OUTPUT
HIP6601
-
-
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
STAGE SHOWN
-
+
SENSING
-
+
-
+
HIP6303


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