IR3522 International Rectifier, IR3522 Datasheet - Page 13

• Manufacturer Part Number: IR3522
• Description: DDR & VTT CONTROL IC
• Manufacturer: International Rectifier

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IR3522 THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3522 is shown in Figure 7. The following discussions are applicable to either output
plane unless otherwise specified.
Page 13
VOSEN2+
VOSEN2-
OCSET2
ENABLE
OCSET1
EAOUT2
VOUT2
VREF1
ROSC
LGND
VCCL
IIN2
FB2
IIN1
0.6V
DETECT PULSE1
SS_DI SCHARGED
VREF BUFFER
AMPLIFIER
ROSC BUFFER
AMPLIFIER
IROSC
DIS
IROSC
+
-
OC LIMIT COMPARATOR2
VOUT2 UV
COMPARATOR
2X IROSC
VCCL
ENABLE COMPARATOR
1.65V
1V
OC LIMIT COMPARATOR 1
VCCL
25k
25k
25k
INTERNAL
CIRCUIT BIAS
UV2
4.43V
3.99V
DIS
ERROR
AMPLIFIER 2
ISOURCE
SRD_PRESET#
ISINK
-
+
OPEN
SENSE LINE
DETECT
CIRCUIT 2
INTERNAL_CROWBAR
+
-
-
+
-
+
-
+
-
CURRENT
SOURCE
GENERATOR
SVI_OFF
+
-
+
-
+
-
VCCL UVL
COMPARATOR
VREF_TRACK
250nS
BLANKING
275mV
315mV
OVER VOLTAGE
COMPARAT OR 2
REMOTE SENSE
AMPLIFIER 2
OC1
OC2
25k
IROSC
70mV
VREF1
IROSC
VID0
CLKOUT
PHSOUT
IROSC
VCCL UVLO
CLKOUT
1.0 6V
VCCL UVLO
Figure 7 Block Diagram
OC DELAY
COUTER
-
+
OPEN DAISY
VID1 OFF
VID2 OFF
VREF_TRACK
VREF1_FAST
PHSIN PHSOUT
D/A CONVERT ER
PHSIN
OV1_2
FAULT
SS_DISCHARGED
VID7
PHSOUT
OC TIMEOUT
VCCL
VOUT1
SRD PRESET
SVI _OFF
ENABLE
Open Control
Loop
OPEN DAISY
OPEN SENSE
OPEN CONTROL 2
OPEN CONTROL 1
TRACK_FLT
OV1-2
SRD_PRESET#
-
+
VREF1 CODE
STORAGE LATCH
T RACK FAULT
COMPARAT OR
VOUT1
OV1
OV2
Q
OPEN SENSE
.
R
CLK
OPEN CONTROL 1
VID7
D
SS Comparators
TRACK_FLT
OPEN CONTROL 2
Fault Latch
Control Logic
ENABLE
VID7
OVER VOLT AGE
COMPARATOR 1
VID1
0
0
1
1
SS/DEL
POWER-UP VREF1
CONTROL
DLY _OUT
SOFT ST ART
CLAMP
VID7
VID7
VID7
-
+
SVI ADDRESS
VALID I2C
COMMAND
OVERRIDE
ARRIVED
DETECT PULSE1
SS_DISCHARGED
VID0
0
1
0
1
+
-
TRACK
CONTROL
VREF
CONTROL
1.4V
SOFT STOP
REMOTE SENSE
AMPLIFIER 1
I NTERNAL_CROWBAR
25k
VREF1
1.05V
1.2V
1.35V
1.5V
260mV
+
-
VID3
VID7
VID7
VID7
VID7
SVI (Serial VID Int erface)
VID3
OPEN SENSE
LINE DETECT
CIRCUIT 1
DLY _OUT
UV2
UV1
I NTERNAL_CROWBAR
VREF1
25k
25k
+
-
25k
275mV
315mV
+
-
3.9V
ICHG
45uA
IDCHG
55uA
ERROR
AMPLIFIER 1
+
-
+
-
+
-
+
-
+
+
-
3.3V
VOUT1 UV
COMPARATOR
DIS
+
-
VID3
VID3
VID3
1.65V
UV1
VCCL
950mV
650mV
25k
CROWBAR
PGOOD
VOUT1
VOSEN1+
PGBIAS
VOSEN1-
SS/DEL1
EAOUT1
FB1
SCL
SDA
VID1
VID0
ADDR1
ADDR2
V3.01
IR3522