IR3522 International Rectifier, IR3522 Datasheet - Page 8

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

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Note 1: Guaranteed by design, but not tested in production
Note 2: VDACx Outputs are trimmed to compensate for Error & Amp Remote Sense Amp input offsets
Bold Letters: Critical specs
SYSTEM SET POINT TEST
Converter output voltage is determined by the system set point voltage which is the voltage that appears at the
FBx pins when the converter is in regulation. The set point voltage includes error terms for the VDAC digital-to-
analog converters, the Error Amp input offsets, and the Remote Sense input offsets. The voltage appearing at
the VDACx pins is not the system set point voltage. System set point voltage test circuits for Outputs 1 and 2 are
shown in Figures 2A and 2B.
Supply Current
UVLO Start Threshold
UVLO Stop Threshold
Hysteresis
VCCL
Page 8
PARAMETER
VOUT1
IR3522
IR3522
"FAST"
VDAC
IROSC
Figure 2A - Output 1 System Set Point Test Circuit
Figure 2B - Output 2 System Set Point Test Circuit
+
-
VREF_TRACK
CURRENT
SOURCE
GENERATOR
VREF1
BUFFER
AMPLIFIER
ISOURCE
ISINK
TEST CONDITION
ROSC BUFFER
AMPLIFIER
+
-
REMOTE SENSE
AMPLIFIER
REMOTE SENSE
AMPLIFIER 2
ERROR
AMPLIFIER
+
-
+
-
0.6V
ERROR
AMPLIFIER 2
IROSC
+
-
+
-
IOCSET1
EAOUT1
FB1
VREF1
OC SET1
LGND
ROSC
VOUT1
VOSEN1+
VOSEN1-
ROCSET1
RVREF1
CVREF1
RROSC
EAOUT2
FB2
VOUT2
VOSEN2+
VOSEN2-
MIN
4.20
0.36
3.5
3.8
SYSTEM
SET POINT
VOLTAGE
EAOUT
VOSNS-
TYP
4.43
3.99
0.42
7
SYSTEM
SET POINT
VOLTAGE
EAOUT
VOSNS-
V3.01
IR3522
MAX
0.46
4.7
4.3
15
UNIT
mA
V
V
V