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HIP6303 Datasheet(PDF) 11 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) 11 Page - Renesas Technology Corp

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HIP6303
FN4767 Rev.0.00
Page 11 of 16
December 1999
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
A at full output load current, and the nominal trip point for
over-current detection is 165% of that value, or 82.5
A.
Therefore, RISEN = IL x rDS(ON) (Q2) / 50A.
For a full load of 25A per channel, and an rDS(ON) (Q2) of
4m
, RISEN = 2k.
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.
Droop, Selection of RIN
The average of the currents detected through the RISEN
resistors is also steered to the FB pin. There is no DC return
path connected to the FB pin except for RIN, so the average
current creates a voltage drop across RIN. This drop increases
the apparent VCORE voltage with increasing load current,
causing the system to decrease VCORE to maintain balance at
the FB pin. This is the desired “droop” voltage used to maintain
VCORE within limits under transient conditions.
With a high dv/dt load transient, typical of high performance
microprocessors, the largest deviations in output voltage occur
at the leading and trailing edges of the load transient. In order to
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
-
+
-
+


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