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IR3080M Datasheet(PDF) 8 Page - International Rectifier

Part # IR3080M
Description  XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
Download  21 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3080M Datasheet(HTML) 8 Page - International Rectifier

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IR3080
PWM Control Method
The PWM block diagram of the XPhase
TM architecture is shown in Figure 2. Feed-forward voltage mode control with
trailing edge modulation is used. A high-gain wide-bandwidth voltage type error amplifier in the Control IC is used
for the voltage control loop. An external RC circuit connected to the input voltage and ground is used to program the
slope of the PWM ramp and to provide the feed-forward control at each phase. The PWM ramp slope will change
with the input voltage and automatically compensate for changes in the input voltage. The input voltage can change
due to variations in the silver box output voltage or due to wire and PCB-trace voltage drop related to changes in
load current.
+
-
10K
SHARE
ADJUST
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
X34
X
0.91
20mV
+
-
10K
SHARE
ADJUST
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
X34
20mV
X
0.91
+
-
DACIN
PWMRMP
BIASIN
RAMPIN-
RAMPIN+
GATEH
SCOMP
ISHARE
CSIN+
GATEL
EAIN
CSIN-
SYSTEM
REFERENCE
VOLTAGE
ENABLE
CLOCK
PULSE
GENERATOR
BODY
BRAKING
COMPARATOR
RAMP
DISCHARGE
CLAMP
PWM
LATCH
S
RESET
DOMINANT
PHASE IC
R
PWM
COMPARATOR
RDRP
RPWMRMP
RPHS2
CSCOMP
RPHS1
RCS
RVFB
CPWMRMP
CSCOMP
CCS
RPWMRMP
RCS
+
-
CPWMRMP
CCS
RPHS2
RPHS1
+
-
GND
VOUT
BIASIN
VDAC
VBIAS
DACIN
PWMRMP
RAMPIN+
VOSNS-
VOSNS+
VOSNS-
ISHARE
RAMPIN-
IIN
VDRP
EAIN
GATEH
SCOMP
CSIN-
CSIN+
GATEL
EAOUT
RMPOUT
VIN
FB
IROSC
SYSTEM
REFERENCE
VOLTAGE
VDAC
BODY
BRAKING
COMPARATOR
RAMP
DISCHARGE
CLAMP
ENABLE
CLOCK
PULSE
GENERATOR
VBIAS
REGULATOR
IFB
VDRP
AMP
50%
DUTY
CYCLE
RAMP GENERATOR
VVALLEY
VPEAK
ERROR
AMP
R
S
RESET
DOMINANT
PWM
LATCH
PHASE IC
COUT
CONTROL IC
PWM
COMPARATOR
Figure 2. PWM Block Diagram
Frequency and Phase Timing Control
The oscillator is located in the Control IC and its frequency is programmable from 150kHz to 1MHZ by an external
resistor. The output of the oscillator is a 50% duty cycle triangle waveform with peak and valley voltages of
approximately 5V and 1V respectively. This signal is used to program both the switching frequency and phase
timing of the Phase ICs. The Phase IC is programmed by resistor divider RPHS1 and RPHS2 connected between the
VBIAS reference voltage and the Phase IC LGND pin. A comparator in the Phase ICs detects the crossing of the
oscillator waveform over the voltage generated by the resistor divider and triggers a clock pulse that starts the PWM
cycle. The peak and valley voltages track the VBIAS voltage reducing potential Phase IC timing errors. Figure 3
shows the Phase timing for an 8 phase converter. Note that both slopes of the triangle waveform can be used for
phase timing by swapping the RMPIN+ and RMPIN– pins, as shown in Figure 2.
Page 8 of 41
9/30/04


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