IR3529MTRPBF International Rectifier, IR3529MTRPBF Datasheet - Page 15

• Manufacturer Part Number: IR3529MTRPBF
• Description: IC CTRL XPHASE CPU/ASIC 20-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3529MTRPBF

• Applications: Processor
• Current - Supply: 2mA
• Voltage - Supply: 8 V ~ 16 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 20-Lead MLPQ
• Circuit: X-Phase Phase IC
• Iout (a): 4.0A Gate Driver
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3529MTRPBFTR

Over Voltage Protection (OVP)
The IR3529 includes over-voltage protection that turns on the low side MOSFET to protect the load in the event of
a shorted high-side MOSFET, converter out of regulation, or connection of the converter output to an excessive
output voltage. As shown in Figure 8, if IOUT pin voltage is above V(VCCL) – 0.8V, which represents over-voltage
condition detected by control IC, the over-voltage latch is set. GATEL drives high and GATEH drives low. The OVP
circuit overrides the normal PWM operation and within approximately 150ns will fully turn-on the low side
MOSFET, which remains in conduction until IOUT drops below V(VCCL) – 0.8V when over voltage ends. The over
voltage fault is latched in control IC and can only be reset by cycling the power to control IC. The error amplifier
output (EAIN) is pulled down by control IC and will remain low. The lower MOSFETs alone can not clamp the
output voltage however a SCR or N-MOSFET could be triggered with the OVP output to prevent processor
damage.
Operation at Higher Output Voltage
The proper operation of the phase IC is ensured for output voltage up to 5.1V. Similarly, the minimum VCC for
proper operation of the phase IC is 8 V. Operating below this minimum voltage, the current sharing performance of
the phase IC is affected.
IOUT(ISHARE)
(PHASE IC)
(PHASE IC)
OUTPUT
VOLTAGE
FAULT
LATCH
ERROR
AMPLIFIER
OUTPUT
(EAOUT)
GATEH
GATEL
(VO)
Page 15 of 22
VCCL-800 mV
VDAC
OVP
THRESHOLD
Figure 8: Over-voltage protection waveforms
NORMAL OPERATION
130mV
OVP CONDITION
February 12, 2010
IR3529
AFTER
OVP